moebius#92: HTML - input - datetime

+ native in moebius:

Bug 1317600: https://bugzilla.mozilla.org/show_bug.cgi?id=1317600
A note - not implemented: Bug 1282768:
https://bugzilla.mozilla.org/show_bug.cgi?id=1282768
*.css: filter: url("chrome://global/skin/filters.svg#fill");, fill:

Bug 1283385: https://bugzilla.mozilla.org/show_bug.cgi?id=1283385
Bug 1323109: https://bugzilla.mozilla.org/show_bug.cgi?id=1323109
Bug 1314544: https://bugzilla.mozilla.org/show_bug.cgi?id=1314544
Bug 1286182: https://bugzilla.mozilla.org/show_bug.cgi?id=1286182

Bug 1325922: https://bugzilla.mozilla.org/show_bug.cgi?id=1325922
A note - not implemented: Bug 1282768:
https://bugzilla.mozilla.org/show_bug.cgi?id=1282768
*.css: filter: url("chrome://global/skin/filters.svg#fill");, fill:

Bug 1320225: https://bugzilla.mozilla.org/show_bug.cgi?id=1320225
Bug 1341190: https://bugzilla.mozilla.org/show_bug.cgi?id=1341190

11 files changed, 700 insertions, 172 deletions

diff --git a/toolkit/content/tests/browser/browser.ini b/toolkit/content/tests/browser/browser.ini
index 278b2ffe0..67ba2f850 100644
--- a/toolkit/content/tests/browser/browser.ini
+++ b/toolkit/content/tests/browser/browser.ini
@@ -26,6 +26,7 @@ skip-if = !e10s
 [browser_contentTitle.js]
 [browser_crash_previous_frameloader.js]
 run-if = e10s && crashreporter
+[browser_datetime_datepicker.js]
 [browser_default_image_filename.js]
 [browser_f7_caret_browsing.js]
 [browser_findbar.js]
diff --git a/toolkit/content/tests/browser/browser_datetime_datepicker.js b/toolkit/content/tests/browser/browser_datetime_datepicker.js
new file mode 100644
index 000000000..a0db761b7
--- /dev/null
+++ b/toolkit/content/tests/browser/browser_datetime_datepicker.js
@@ -0,0 +1,222 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const MONTH_YEAR = ".month-year",
+      DAYS_VIEW = ".days-view",
+      BTN_PREV_MONTH = ".prev",
+      BTN_NEXT_MONTH = ".next";
+const DATE_FORMAT = new Intl.DateTimeFormat("en-US", { year: "numeric", month: "long", timeZone: "UTC" }).format;
+
+// Create a list of abbreviations for calendar class names
+const W = "weekend",
+      O = "outside",
+      S = "selection",
+      R = "out-of-range",
+      T = "today",
+      P = "off-step";
+
+// Calendar classlist for 2016-12. Used to verify the classNames are correct.
+const calendarClasslist_201612 = [
+  [W, O], [O], [O], [O], [],  [],  [W],
+  [W],    [],  [],  [],  [],  [],  [W],
+  [W],    [],  [],  [],  [S], [],  [W],
+  [W],    [],  [],  [],  [],  [],  [W],
+  [W],    [],  [],  [],  [],  [],  [W],
+  [W, O], [O], [O], [O], [O], [O], [W, O],
+];
+
+function getCalendarText() {
+  return helper.getChildren(DAYS_VIEW).map(child => child.textContent);
+}
+
+function getCalendarClassList() {
+  return helper.getChildren(DAYS_VIEW).map(child => Array.from(child.classList));
+}
+
+function mergeArrays(a, b) {
+  return a.map((classlist, index) => classlist.concat(b[index]));
+}
+
+let helper = new DateTimeTestHelper();
+
+registerCleanupFunction(() => {
+  helper.cleanup();
+});
+
+/**
+ * Test that date picker opens to today's date when input field is blank
+ */
+add_task(async function test_datepicker_today() {
+  const date = new Date();
+
+  await helper.openPicker("data:text/html, <input type='date'>");
+
+  Assert.equal(helper.getElement(MONTH_YEAR).textContent, DATE_FORMAT(date));
+
+  await helper.tearDown();
+});
+
+/**
+ * Test that date picker opens to the correct month, with calendar days
+ * displayed correctly, given a date value is set.
+ */
+add_task(async function test_datepicker_open() {
+  const inputValue = "2016-12-15";
+
+  await helper.openPicker(`data:text/html, <input type="date" value="${inputValue}">`);
+
+  Assert.equal(helper.getElement(MONTH_YEAR).textContent, DATE_FORMAT(new Date(inputValue)));
+  Assert.deepEqual(
+    getCalendarText(),
+    [
+      "27", "28", "29", "30",  "1",  "2",  "3",
+       "4",  "5",  "6",  "7",  "8",  "9", "10",
+      "11", "12", "13", "14", "15", "16", "17",
+      "18", "19", "20", "21", "22", "23", "24",
+      "25", "26", "27", "28", "29", "30", "31",
+       "1",  "2",  "3",  "4",  "5",  "6",  "7",
+    ],
+    "2016-12",
+  );
+  Assert.deepEqual(
+    getCalendarClassList(),
+    calendarClasslist_201612,
+    "2016-12 classNames"
+  );
+
+  await helper.tearDown();
+});
+
+/**
+ * When the prev month button is clicked, calendar should display the dates for
+ * the previous month.
+ */
+add_task(async function test_datepicker_prev_month_btn() {
+  const inputValue = "2016-12-15";
+  const prevMonth = "2016-11-01";
+
+  await helper.openPicker(`data:text/html, <input type="date" value="${inputValue}">`);
+  helper.click(helper.getElement(BTN_PREV_MONTH));
+
+  Assert.equal(helper.getElement(MONTH_YEAR).textContent, DATE_FORMAT(new Date(prevMonth)));
+  Assert.deepEqual(
+    getCalendarText(),
+    [
+      "30", "31",  "1",  "2",  "3",  "4",  "5",
+       "6",  "7",  "8",  "9", "10", "11", "12",
+      "13", "14", "15", "16", "17", "18", "19",
+      "20", "21", "22", "23", "24", "25", "26",
+      "27", "28", "29", "30",  "1",  "2",  "3",
+       "4",  "5",  "6",  "7",  "8",  "9", "10",
+    ],
+    "2016-11",
+  );
+
+  await helper.tearDown();
+});
+
+/**
+ * When the next month button is clicked, calendar should display the dates for
+ * the next month.
+ */
+add_task(async function test_datepicker_next_month_btn() {
+  const inputValue = "2016-12-15";
+  const nextMonth = "2017-01-01";
+
+  await helper.openPicker(`data:text/html, <input type="date" value="${inputValue}">`);
+  helper.click(helper.getElement(BTN_NEXT_MONTH));
+
+  Assert.equal(helper.getElement(MONTH_YEAR).textContent, DATE_FORMAT(new Date(nextMonth)));
+  Assert.deepEqual(
+    getCalendarText(),
+    [
+      "25", "26", "27", "28", "29", "30", "31",
+       "1",  "2",  "3",  "4",  "5",  "6",  "7",
+       "8",  "9", "10", "11", "12", "13", "14",
+      "15", "16", "17", "18", "19", "20", "21",
+      "22", "23", "24", "25", "26", "27", "28",
+      "29", "30", "31",  "1",  "2",  "3",  "4",
+    ],
+    "2017-01",
+  );
+
+  await helper.tearDown();
+});
+
+/**
+ * When a date on the calendar is clicked, date picker should close and set
+ * value to the input box.
+ */
+add_task(async function test_datepicker_clicked() {
+  const inputValue = "2016-12-15";
+  const firstDayOnCalendar = "2016-11-27";
+
+  await helper.openPicker(`data:text/html, <input type="date" value="${inputValue}">`);
+  // Click the first item (top-left corner) of the calendar
+  helper.click(helper.getElement(DAYS_VIEW).children[0]);
+  await ContentTask.spawn(helper.tab.linkedBrowser, {}, async function() {
+    let inputEl = content.document.querySelector("input");
+    await ContentTaskUtils.waitForEvent(inputEl, "input");
+  });
+
+  Assert.equal(content.document.querySelector("input").value, firstDayOnCalendar);
+
+  await helper.tearDown();
+});
+
+/**
+ * When min and max attributes are set, calendar should show some dates as
+ * out-of-range.
+ */
+add_task(async function test_datepicker_min_max() {
+  const inputValue = "2016-12-15";
+  const inputMin = "2016-12-05";
+  const inputMax = "2016-12-25";
+
+  await helper.openPicker(`data:text/html, <input type="date" value="${inputValue}" min="${inputMin}" max="${inputMax}">`);
+
+  Assert.deepEqual(
+    getCalendarClassList(),
+    mergeArrays(calendarClasslist_201612, [
+      // R denotes out-of-range
+      [R], [R], [R], [R], [R], [R], [R],
+      [R], [],  [],  [],  [],  [],  [],
+      [],  [],  [],  [],  [],  [],  [],
+      [],  [],  [],  [],  [],  [],  [],
+      [],  [R], [R], [R], [R], [R], [R],
+      [R], [R], [R], [R], [R], [R], [R],
+    ]),
+    "2016-12 with min & max",
+  );
+
+  await helper.tearDown();
+});
+
+/**
+ * When step attribute is set, calendar should show some dates as off-step.
+ */
+add_task(async function test_datepicker_step() {
+  const inputValue = "2016-12-15";
+  const inputStep = "5";
+
+  await helper.openPicker(`data:text/html, <input type="date" value="${inputValue}" step="${inputStep}">`);
+
+  Assert.deepEqual(
+    getCalendarClassList(),
+    mergeArrays(calendarClasslist_201612, [
+      // P denotes off-step
+      [P], [P], [P], [],  [P], [P], [P],
+      [P], [],  [P], [P], [P], [P], [],
+      [P], [P], [P], [P], [],  [P], [P],
+      [P], [P], [],  [P], [P], [P], [P],
+      [],  [P], [P], [P], [P], [],  [P],
+      [P], [P], [P], [],  [P], [P], [P],
+    ]),
+    "2016-12 with step",
+  );
+
+  await helper.tearDown();
+});
diff --git a/toolkit/content/tests/browser/head.js b/toolkit/content/tests/browser/head.js
index 1c6c2b54f..e3ef19538 100644
--- a/toolkit/content/tests/browser/head.js
+++ b/toolkit/content/tests/browser/head.js
@@ -31,3 +31,88 @@ function pushPrefs(...aPrefs) {
   SpecialPowers.pushPrefEnv({"set": aPrefs}, deferred.resolve);
   return deferred.promise;
 }
+
+/**
+ * Helper class for testing datetime input picker widget
+ */
+class DateTimeTestHelper {
+  constructor() {
+    this.panel = document.getElementById("DateTimePickerPanel");
+    this.panel.setAttribute("animate", false);
+    this.tab = null;
+    this.frame = null;
+  }
+
+  /**
+   * Opens a new tab with the URL of the test page, and make sure the picker is
+   * ready for testing.
+   *
+   * @param  {String} pageUrl
+   */
+  async openPicker(pageUrl) {
+    this.tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, pageUrl);
+    await BrowserTestUtils.synthesizeMouseAtCenter("input", {}, gBrowser.selectedBrowser);
+    // If dateTimePopupFrame doesn't exist yet, wait for the binding to be attached
+    if (!this.panel.dateTimePopupFrame) {
+      await BrowserTestUtils.waitForEvent(this.panel, "DateTimePickerBindingReady")
+    }
+    this.frame = this.panel.dateTimePopupFrame;
+    await BrowserTestUtils.waitForEvent(this.frame, "load", true);
+    // Wait for picker elements to be ready and open panel transition to end
+    await BrowserTestUtils.waitForEvent(this.frame.contentDocument, "PickerReady");
+  }
+
+  /**
+   * Find an element on the picker.
+   *
+   * @param  {String} selector
+   * @return {DOMElement}
+   */
+  getElement(selector) {
+    return this.frame.contentDocument.querySelector(selector);
+  }
+
+  /**
+   * Find the children of an element on the picker.
+   *
+   * @param  {String} selector
+   * @return {Array<DOMElement>}
+   */
+  getChildren(selector) {
+    return Array.from(this.getElement(selector).children);
+  }
+
+  /**
+   * Click on an element
+   *
+   * @param  {DOMElement} element
+   */
+  click(element) {
+    EventUtils.synthesizeMouseAtCenter(element, {}, this.frame.contentWindow);
+  }
+
+  /**
+   * Close the panel and the tab
+   */
+  async tearDown() {
+    if (!this.panel.hidden) {
+      let pickerClosePromise = new Promise(resolve => {
+        this.panel.addEventListener("popuphidden", resolve, {once: true});
+      });
+      this.panel.closePicker();
+      await pickerClosePromise;
+    }
+    await BrowserTestUtils.removeTab(this.tab);
+    this.tab = null;
+  }
+
+  /**
+   * Clean up after tests. Remove the frame to prevent leak.
+   */
+  cleanup() {
+    this.frame.remove();
+    this.frame = null;
+    this.panel.removeAttribute("animate");
+    this.panel = null;
+  }
+}
diff --git a/toolkit/content/widgets/calendar.js b/toolkit/content/widgets/calendar.js
index 72e0d9d61..80c2976e0 100644
--- a/toolkit/content/widgets/calendar.js
+++ b/toolkit/content/widgets/calendar.js
@@ -54,23 +54,21 @@ function Calendar(options, context) {
      *          {
      *            {Number} textContent
      *            {Array<String>} classNames
+     *            {Boolean} enabled
      *          }
      *          {Function} getDayString: Transform day number to string
      *          {Function} getWeekHeaderString: Transform day of week number to string
-     *          {Function} setValue: Set value for dateKeeper
-     *          {Number} selectionValue: The selection date value
+     *          {Function} setSelection: Set selection for dateKeeper
      *        }
      */
     setProps(props) {
       if (props.isVisible) {
         // Transform the days and weekHeaders array for rendering
-        const days = props.days.map(({ dateValue, textContent, classNames }) => {
+        const days = props.days.map(({ dateObj, classNames, enabled }) => {
           return {
-            dateValue,
-            textContent: props.getDayString(textContent),
-            className: dateValue == props.selectionValue ?
-                       classNames.concat("selection").join(" ") :
-                       classNames.join(" ")
+          textContent: props.getDayString(dateObj.getUTCDate()),
+          className: classNames.join(" "),
+          enabled
           };
         });
         const weekHeaders = props.weekHeaders.map(({ textContent, classNames }) => {
@@ -152,10 +150,10 @@ function Calendar(options, context) {
         case "click": {
           if (event.target.parentNode == this.context.daysView) {
             let targetId = event.target.dataset.id;
-            this.props.setValue({
-              selectionValue: this.props.days[targetId].dateValue,
-              dateValue: this.props.days[targetId].dateValue
-            });
+            let targetObj = this.props.days[targetId];
+            if (targetObj.enabled) {
+              this.props.setSelection(targetObj.dateObj);
+            }
           }
           break;
         }
diff --git a/toolkit/content/widgets/datekeeper.js b/toolkit/content/widgets/datekeeper.js
index de01fdade..9777ee647 100644
--- a/toolkit/content/widgets/datekeeper.js
+++ b/toolkit/content/widgets/datekeeper.js
@@ -6,41 +6,72 @@
 
 /**
  * DateKeeper keeps track of the date states.
- *
- * @param {Object} date parts
- *        {
- *          {Number} year
- *          {Number} month
- *          {Number} day
- *        }
- *        {Object} options
- *        {
- *          {Number} firstDayOfWeek [optional]
- *          {Array<Number>} weekends [optional]
- *          {Number} calViewSize [optional]
- *        }
  */
-function DateKeeper({ year, month, day }, { firstDayOfWeek = 0, weekends = [0], calViewSize = 42 }) {
-  this.state = {
-    firstDayOfWeek, weekends, calViewSize,
-    dateObj: new Date(0),
-    years: [],
-    months: [],
-    days: []
-  };
-  this.state.weekHeaders = this._getWeekHeaders(firstDayOfWeek);
-  this._update(year, month, day);
+function DateKeeper(props) {
+  this.init(props);
 }
 
 {
   const DAYS_IN_A_WEEK = 7,
         MONTHS_IN_A_YEAR = 12,
         YEAR_VIEW_SIZE = 200,
-        YEAR_BUFFER_SIZE = 10;
+        YEAR_BUFFER_SIZE = 10,
+        // The min and max values are derived from the ECMAScript spec:
+        // http://ecma-international.org/ecma-262/5.1/#sec-15.9.1.1
+        MIN_DATE = -8640000000000000,
+        MAX_DATE = 8640000000000000;
 
   DateKeeper.prototype = {
+    get year() {
+      return this.state.dateObj.getUTCFullYear();
+    },
+
+    get month() {
+      return this.state.dateObj.getUTCMonth();
+    },
+
+    get day() {
+      return this.state.dateObj.getUTCDate();
+    },
+
+    get selection() {
+      return this.state.selection;
+    },
+
+    /**
+     * Initialize DateKeeper
+     * @param  {Number} year
+     * @param  {Number} month
+     * @param  {Number} day
+     * @param  {String} min
+     * @param  {String} max
+     * @param  {Number} firstDayOfWeek
+     * @param  {Array<Number>} weekends
+     * @param  {Number} calViewSize
+     */
+    init({ year, month, day, min, max, firstDayOfWeek = 0, weekends = [0], calViewSize = 42 }) {
+      const today = new Date();
+      const isDateSet = year != undefined && month != undefined && day != undefined;
+
+      this.state = {
+        firstDayOfWeek, weekends, calViewSize,
+        min: new Date(min != undefined ? min : MIN_DATE),
+        max: new Date(max != undefined ? max : MAX_DATE),
+        today: this._newUTCDate(today.getFullYear(), today.getMonth(), today.getDate()),
+        weekHeaders: this._getWeekHeaders(firstDayOfWeek, weekends),
+        years: [],
+        months: [],
+        days: [],
+        selection: { year, month, day },
+      };
+
+      this.state.dateObj = isDateSet ?
+                           this._newUTCDate(year, month, day) :
+                           new Date(this.state.today);
+    },
     /**
-     * Set new date
+     * Set new date. The year is always treated as full year, so the short-form
+     * is not supported.
      * @param {Object} date parts
      *        {
      *          {Number} year [optional]
@@ -48,17 +79,21 @@ function DateKeeper({ year, month, day }, { firstDayOfWeek = 0, weekends = [0],
      *          {Number} date [optional]
      *        }
      */
-    set({ year = this.state.year, month = this.state.month, day = this.state.day }) {
-      this._update(year, month, day);
+    set({ year = this.year, month = this.month, day = this.day }) {
+      // Use setUTCFullYear so that year 99 doesn't get parsed as 1999
+      this.state.dateObj.setUTCFullYear(year, month, day);
     },
 
     /**
-     * Set date with value
-     * @param {Number} value: Date value
+     * Set selection date
+     * @param {Number} year
+     * @param {Number} month
+     * @param {Number} day
      */
-    setValue(value) {
-      const dateObj = new Date(value);
-      this._update(dateObj.getUTCFullYear(), dateObj.getUTCMonth(), dateObj.getUTCDate());
+    setSelection({ year, month, day }) {
+      this.state.selection.year = year;
+      this.state.selection.month = month;
+      this.state.selection.day = day;
     },
 
     /**
@@ -66,8 +101,10 @@ function DateKeeper({ year, month, day }, { firstDayOfWeek = 0, weekends = [0],
      * @param {Number} month
      */
     setMonth(month) {
-      const lastDayOfMonth = this._newUTCDate(this.state.year, month + 1, 0).getUTCDate();
-      this._update(this.state.year, month, Math.min(this.state.day, lastDayOfMonth));
+      const lastDayOfMonth = this._newUTCDate(this.year, month + 1, 0).getUTCDate();
+      this.set({ year: this.year,
+                 month,
+                 day: Math.min(this.day, lastDayOfMonth) });
     },
 
     /**
@@ -75,8 +112,10 @@ function DateKeeper({ year, month, day }, { firstDayOfWeek = 0, weekends = [0],
      * @param {Number} year
      */
     setYear(year) {
-      const lastDayOfMonth = this._newUTCDate(year, this.state.month + 1, 0).getUTCDate();
-      this._update(year, this.state.month, Math.min(this.state.day, lastDayOfMonth));
+      const lastDayOfMonth = this._newUTCDate(year, this.month + 1, 0).getUTCDate();
+      this.set({ year,
+                 month: this.month,
+                 day: Math.min(this.day, lastDayOfMonth) });
     },
 
     /**
@@ -84,22 +123,10 @@ function DateKeeper({ year, month, day }, { firstDayOfWeek = 0, weekends = [0],
      * @param {Number} offset
      */
     setMonthByOffset(offset) {
-      const lastDayOfMonth = this._newUTCDate(this.state.year, this.state.month + offset + 1, 0).getUTCDate();
-      this._update(this.state.year, this.state.month + offset, Math.min(this.state.day, lastDayOfMonth));
-    },
-
-    /**
-     * Update the states.
-     * @param  {Number} year  [description]
-     * @param  {Number} month [description]
-     * @param  {Number} day  [description]
-     */
-    _update(year, month, day) {
-      // Use setUTCFullYear so that year 99 doesn't get parsed as 1999
-      this.state.dateObj.setUTCFullYear(year, month, day);
-      this.state.year = this.state.dateObj.getUTCFullYear();
-      this.state.month = this.state.dateObj.getUTCMonth();
-      this.state.day = this.state.dateObj.getUTCDate();
+      const lastDayOfMonth = this._newUTCDate(this.year, this.month + offset + 1, 0).getUTCDate();
+      this.set({ year: this.year,
+                 month: this.month + offset,
+                 day: Math.min(this.day, lastDayOfMonth) });
     },
 
     /**
@@ -111,7 +138,6 @@ function DateKeeper({ year, month, day }, { firstDayOfWeek = 0, weekends = [0],
      *         }
      */
     getMonths() {
-      // TODO: add min/max and step support
       let months = [];
 
       for (let i = 0; i < MONTHS_IN_A_YEAR; i++) {
@@ -133,12 +159,11 @@ function DateKeeper({ year, month, day }, { firstDayOfWeek = 0, weekends = [0],
      *         }
      */
     getYears() {
-      // TODO: add min/max and step support
       let years = [];
 
       const firstItem = this.state.years[0];
       const lastItem = this.state.years[this.state.years.length - 1];
-      const currentYear = this.state.dateObj.getUTCFullYear();
+      const currentYear = this.year;
 
       // Generate new years array when the year is outside of the first &
       // last item range. If not, return the cached result.
@@ -161,30 +186,43 @@ function DateKeeper({ year, month, day }, { firstDayOfWeek = 0, weekends = [0],
      * Get days for calendar
      * @return {Array<Object>}
      *         {
-     *           {Number} dateValue
-     *           {Number} textContent
+     *           {Date} dateObj
      *           {Array<String>} classNames
+     *           {Boolean} enabled
      *         }
      */
     getDays() {
-      // TODO: add min/max and step support
-      let firstDayOfMonth = this._getFirstCalendarDate(this.state.dateObj, this.state.firstDayOfWeek);
+      // TODO: add step support
+      const firstDayOfMonth = this._getFirstCalendarDate(this.state.dateObj, this.state.firstDayOfWeek);
+      const month = this.month;
       let days = [];
-      let month = this.state.dateObj.getUTCMonth();
 
       for (let i = 0; i < this.state.calViewSize; i++) {
-        let dateObj = this._newUTCDate(firstDayOfMonth.getUTCFullYear(), firstDayOfMonth.getUTCMonth(), firstDayOfMonth.getUTCDate() + i);
+        const dateObj = this._newUTCDate(firstDayOfMonth.getUTCFullYear(), firstDayOfMonth.getUTCMonth(), firstDayOfMonth.getUTCDate() + i);
         let classNames = [];
+        let enabled = true;
         if (this.state.weekends.includes(dateObj.getUTCDay())) {
           classNames.push("weekend");
         }
         if (month != dateObj.getUTCMonth()) {
           classNames.push("outside");
         }
+        if (this.state.selection.year == dateObj.getUTCFullYear() &&
+            this.state.selection.month == dateObj.getUTCMonth() &&
+            this.state.selection.day == dateObj.getUTCDate()) {
+          classNames.push("selection");
+        }
+        if (dateObj.getTime() < this.state.min.getTime() || dateObj.getTime() > this.state.max.getTime()) {
+          classNames.push("out-of-range");
+          enabled = false;
+        }
+        if (this.state.today.getTime() == dateObj.getTime()) {
+          classNames.push("today");
+        }
         days.push({
-          dateValue: dateObj.getTime(),
-          textContent: dateObj.getUTCDate(),
-          classNames
+          dateObj,
+          classNames,
+          enabled,
         });
       }
       return days;
@@ -193,20 +231,21 @@ function DateKeeper({ year, month, day }, { firstDayOfWeek = 0, weekends = [0],
     /**
      * Get week headers for calendar
      * @param  {Number} firstDayOfWeek
+     * @param  {Array<Number>} weekends
      * @return {Array<Object>}
      *         {
      *           {Number} textContent
      *           {Array<String>} classNames
      *         }
      */
-    _getWeekHeaders(firstDayOfWeek) {
+    _getWeekHeaders(firstDayOfWeek, weekends) {
       let headers = [];
       let dayOfWeek = firstDayOfWeek;
 
       for (let i = 0; i < DAYS_IN_A_WEEK; i++) {
         headers.push({
           textContent: dayOfWeek % DAYS_IN_A_WEEK,
-          classNames: this.state.weekends.includes(dayOfWeek % DAYS_IN_A_WEEK) ? ["weekend"] : []
+          classNames: weekends.includes(dayOfWeek % DAYS_IN_A_WEEK) ? ["weekend"] : []
         });
         dayOfWeek++;
       }
diff --git a/toolkit/content/widgets/datepicker.js b/toolkit/content/widgets/datepicker.js
index 210ca856c..317f0ae94 100644
--- a/toolkit/content/widgets/datepicker.js
+++ b/toolkit/content/widgets/datepicker.js
@@ -20,6 +20,12 @@ function DatePicker(context) {
      *           {Number} year [optional]
      *           {Number} month [optional]
      *           {Number} date [optional]
+     *           {String} min
+     *           {String} max
+     *           {Number} firstDayOfWeek
+     *           {Array<Number>} weekends
+     *           {Array<String>} monthStrings
+     *           {Array<String>} weekdayStrings
      *           {String} locale [optional]: User preferred locale
      *         }
      */
@@ -28,57 +34,54 @@ function DatePicker(context) {
       this._setDefaultState();
       this._createComponents();
       this._update();
+      document.dispatchEvent(new CustomEvent("PickerReady"));
     },
 
     /*
      * Set initial date picker states.
      */
     _setDefaultState() {
-      const now = new Date();
-      const { year = now.getFullYear(),
-              month = now.getMonth(),
-              day = now.getDate(),
-              locale } = this.props;
-
-      // TODO: Use calendar info API to get first day of week & weekends
-      //       (Bug 1287503)
+      const { year, month, day, min, max, firstDayOfWeek, weekends,
+              monthStrings, weekdayStrings, locale } = this.props;
       const dateKeeper = new DateKeeper({
-        year, month, day
-      }, {
-        calViewSize: CAL_VIEW_SIZE,
-        firstDayOfWeek: 0,
-        weekends: [0]
+        year, month, day, min, max, firstDayOfWeek, weekends,
+        calViewSize: CAL_VIEW_SIZE
       });
 
       this.state = {
         dateKeeper,
         locale,
         isMonthPickerVisible: false,
-        isYearSet: false,
-        isMonthSet: false,
-        isDateSet: false,
         getDayString: new Intl.NumberFormat(locale).format,
-        // TODO: use calendar terms when available (Bug 1287677)
-        getWeekHeaderString: weekday => ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"][weekday],
-        setValue: ({ dateValue, selectionValue }) => {
-          dateKeeper.setValue(dateValue);
-          this.state.selectionValue = selectionValue;
-          this.state.isYearSet = true;
-          this.state.isMonthSet = true;
-          this.state.isDateSet = true;
+        getWeekHeaderString: weekday => weekdayStrings[weekday],
+        getMonthString: month => monthStrings[month],
+        setSelection: date => {
+          dateKeeper.setSelection({
+            year: date.getUTCFullYear(),
+            month: date.getUTCMonth(),
+            day: date.getUTCDate(),
+          });
           this._update();
           this._dispatchState();
           this._closePopup();
         },
         setYear: year => {
           dateKeeper.setYear(year);
-          this.state.isYearSet = true;
+          dateKeeper.setSelection({
+            year,
+            month: dateKeeper.selection.month,
+            day: dateKeeper.selection.day,
+          });
           this._update();
           this._dispatchState();
         },
         setMonth: month => {
           dateKeeper.setMonth(month);
-          this.state.isMonthSet = true;
+          dateKeeper.setSelection({
+            year: dateKeeper.selection.year,
+            month,
+            day: dateKeeper.selection.day,
+          });
           this._update();
           this._dispatchState();
         },
@@ -104,6 +107,7 @@ function DatePicker(context) {
         monthYear: new MonthYear({
           setYear: this.state.setYear,
           setMonth: this.state.setMonth,
+          getMonthString: this.state.getMonthString,
           locale: this.state.locale
         }, {
           monthYear: this.context.monthYear,
@@ -116,7 +120,7 @@ function DatePicker(context) {
      * Update date picker and its components.
      */
     _update() {
-      const { dateKeeper, selectionValue, isMonthPickerVisible } = this.state;
+      const { dateKeeper, isMonthPickerVisible } = this.state;
 
       if (isMonthPickerVisible) {
         this.state.months = dateKeeper.getMonths();
@@ -128,9 +132,7 @@ function DatePicker(context) {
       this.components.monthYear.setProps({
         isVisible: isMonthPickerVisible,
         dateObj: dateKeeper.state.dateObj,
-        month: dateKeeper.state.month,
         months: this.state.months,
-        year: dateKeeper.state.year,
         years: this.state.years,
         toggleMonthPicker: this.state.toggleMonthPicker
       });
@@ -138,10 +140,9 @@ function DatePicker(context) {
         isVisible: !isMonthPickerVisible,
         days: this.state.days,
         weekHeaders: dateKeeper.state.weekHeaders,
-        setValue: this.state.setValue,
+        setSelection: this.state.setSelection,
         getDayString: this.state.getDayString,
-        getWeekHeaderString: this.state.getWeekHeaderString,
-        selectionValue
+        getWeekHeaderString: this.state.getWeekHeaderString
       });
 
       isMonthPickerVisible ?
@@ -162,8 +163,7 @@ function DatePicker(context) {
      * Use postMessage to pass the state of picker to the panel.
      */
     _dispatchState() {
-      const { year, month, day } = this.state.dateKeeper.state;
-      const { isYearSet, isMonthSet, isDaySet } = this.state;
+      const { year, month, day } = this.state.dateKeeper.selection;
       // The panel is listening to window for postMessage event, so we
       // do postMessage to itself to send data to input boxes.
       window.postMessage({
@@ -172,9 +172,6 @@ function DatePicker(context) {
           year,
           month,
           day,
-          isYearSet,
-          isMonthSet,
-          isDaySet
         }
       }, "*");
     },
@@ -255,19 +252,12 @@ function DatePicker(context) {
     set({ year, month, day }) {
       const { dateKeeper } = this.state;
 
-      if (year != undefined) {
-        this.state.isYearSet = true;
-      }
-      if (month != undefined) {
-        this.state.isMonthSet = true;
-      }
-      if (day != undefined) {
-        this.state.isDaySet = true;
-      }
-
       dateKeeper.set({
         year, month, day
       });
+      dateKeeper.setSelection({
+        year, month, day
+      });
       this._update();
     }
   };
@@ -280,12 +270,12 @@ function DatePicker(context) {
    *          {String} locale
    *          {Function} setYear
    *          {Function} setMonth
+   *          {Function} getMonthString
    *        }
    * @param {DOMElement} context
    */
   function MonthYear(options, context) {
     const spinnerSize = 5;
-    const monthFormat = new Intl.DateTimeFormat(options.locale, { month: "short" }).format;
     const yearFormat = new Intl.DateTimeFormat(options.locale, { year: "numeric" }).format;
     const dateFormat = new Intl.DateTimeFormat(options.locale, { year: "numeric", month: "long" }).format;
 
@@ -298,7 +288,7 @@ function DatePicker(context) {
           this.state.isMonthSet = true;
           options.setMonth(month);
         },
-        getDisplayString: month => monthFormat(new Date(0, month)),
+        getDisplayString: options.getMonthString,
         viewportSize: spinnerSize
       }, context.monthYearView),
       year: new Spinner({
@@ -323,8 +313,6 @@ function DatePicker(context) {
      *        {
      *          {Boolean} isVisible
      *          {Date} dateObj
-     *          {Number} month
-     *          {Number} year
      *          {Array<Object>} months
      *          {Array<Object>} years
      *          {Function} toggleMonthPicker
@@ -336,14 +324,14 @@ function DatePicker(context) {
       if (props.isVisible) {
         this.context.monthYear.classList.add("active");
         this.components.month.setState({
-          value: props.month,
+          value: props.dateObj.getUTCMonth(),
           items: props.months,
           isInfiniteScroll: true,
           isValueSet: this.state.isMonthSet,
           smoothScroll: !this.state.firstOpened
         });
         this.components.year.setState({
-          value: props.year,
+          value: props.dateObj.getUTCFullYear(),
           items: props.years,
           isInfiniteScroll: false,
           isValueSet: this.state.isYearSet,
diff --git a/toolkit/content/widgets/datetimebox.css b/toolkit/content/widgets/datetimebox.css
index 18ff024c7..ce638078f 100644
--- a/toolkit/content/widgets/datetimebox.css
+++ b/toolkit/content/widgets/datetimebox.css
@@ -8,9 +8,17 @@
 .datetime-input-box-wrapper {
   -moz-appearance: none;
   display: inline-flex;
+  flex: 1;
   cursor: default;
   background-color: inherit;
   color: inherit;
+  min-width: 0;
+  justify-content: space-between;
+}
+
+.datetime-input-edit-wrapper {
+  overflow: hidden;
+  white-space: nowrap;
 }
 
 .datetime-input {
@@ -43,5 +51,5 @@
   height: 12px;
   width: 12px;
   align-self: center;
-  justify-content: flex-end;
+  flex: none;
 }
diff --git a/toolkit/content/widgets/datetimebox.xml b/toolkit/content/widgets/datetimebox.xml
index 5859f80dd..c276265a3 100644
--- a/toolkit/content/widgets/datetimebox.xml
+++ b/toolkit/content/widgets/datetimebox.xml
@@ -4,6 +4,11 @@
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 
+<!DOCTYPE bindings [
+<!ENTITY % datetimeboxDTD SYSTEM "chrome://global/locale/datetimebox.dtd">
+%datetimeboxDTD;
+]>
+
 <bindings id="datetimeboxBindings"
    xmlns="http://www.mozilla.org/xbl"
    xmlns:html="http://www.w3.org/1999/xhtml"
@@ -21,12 +26,13 @@
     <implementation>
       <constructor>
       <![CDATA[
-        // TODO: Bug 1320227 - [DateTimeInput] localization for
-        // <input type=date> input box
-        this.mMonthPlaceHolder = "mm";
-        this.mDayPlaceHolder = "dd";
-        this.mYearPlaceHolder = "yyyy";
+        /* eslint-disable no-multi-spaces */
+        this.mYearPlaceHolder = ]]>"&date.year.placeholder;"<![CDATA[;
+        this.mMonthPlaceHolder = ]]>"&date.month.placeholder;"<![CDATA[;
+        this.mDayPlaceHolder = ]]>"&date.day.placeholder;"<![CDATA[;
         this.mSeparatorText = "/";
+        /* eslint-enable no-multi-spaces */
+
         this.mMinMonth = 1;
         this.mMaxMonth = 12;
         this.mMinDay = 1;
@@ -76,6 +82,7 @@
         if (this.mInputElement.value) {
           this.setFieldsFromInputValue();
         }
+        this.updateResetButtonVisibility();
       ]]>
       </constructor>
 
@@ -107,9 +114,11 @@
             this.mYearField.setAttribute("typeBuffer", "");
           }
 
-          if (!aFromInputElement) {
+          if (!aFromInputElement && this.mInputElement.value) {
             this.mInputElement.setUserInput("");
           }
+
+          this.updateResetButtonVisibility();
         ]]>
         </body>
       </method>
@@ -170,6 +179,13 @@
       <method name="setInputValueFromFields">
         <body>
         <![CDATA[
+          if (!this.isAnyValueAvailable(false) && this.mInputElement.value) {
+            // Values in the input box was cleared, clear the input element's
+            // value if not empty.
+            this.mInputElement.setUserInput("");
+            return;
+          }
+
           if (this.isFieldInvalid(this.mYearField) ||
               this.isFieldInvalid(this.mMonthField) ||
               this.isFieldInvalid(this.mDayField)) {
@@ -192,6 +208,10 @@
 
           let date = [year, month, day].join("-");
 
+          if (date == this.mInputElement.value) {
+            return;
+          }
+
           this.log("setInputValueFromFields: " + date);
           this.mInputElement.setUserInput(date);
         ]]>
@@ -217,6 +237,9 @@
           if (!this.isEmpty(day)) {
             this.setFieldValue(this.mDayField, day);
           }
+
+          // Update input element's .value if needed.
+          this.setInputValueFromFields();
         ]]>
         </body>
       </method>
@@ -302,6 +325,12 @@
           let targetField = aEvent.originalTarget;
           let key = aEvent.key;
 
+          // Home/End key does nothing on year field.
+          if (targetField == this.mYearField && (key == "Home" ||
+                                                 key == "End")) {
+            return;
+          }
+
           switch (key) {
             case "ArrowUp":
               this.incrementFieldValue(targetField, 1);
@@ -406,11 +435,13 @@
           }
 
           aField.value = value;
+          this.updateResetButtonVisibility();
         ]]>
         </body>
       </method>
 
-      <method name="isValueAvailable">
+      <method name="isAnyValueAvailable">
+        <parameter name="aForPicker"/>
         <body>
         <![CDATA[
           return !this.isEmpty(this.mMonthField.value) ||
@@ -492,6 +523,7 @@
         if (this.mInputElement.value) {
           this.setFieldsFromInputValue();
         }
+        this.updateResetButtonVisibility();
         ]]>
       </constructor>
 
@@ -551,7 +583,7 @@
           }
 
           this.log("setFieldsFromInputValue: " + value);
-          let [hour, minute, second] = value.split(':');
+          let [hour, minute, second] = value.split(":");
 
           this.setFieldValue(this.mHourField, hour);
           this.setFieldValue(this.mMinuteField, minute);
@@ -617,6 +649,13 @@
       <method name="setInputValueFromFields">
         <body>
         <![CDATA[
+          if (!this.isAnyValueAvailable(false) && this.mInputElement.value) {
+            // Values in the input box was cleared, clear the input element's
+            // value if not empty.
+            this.mInputElement.setUserInput("");
+            return;
+          }
+
           if (this.isEmpty(this.mHourField.value) ||
               this.isEmpty(this.mMinuteField.value) ||
               (this.mDayPeriodField && this.isEmpty(this.mDayPeriodField.value)) ||
@@ -652,6 +691,10 @@
             time += "." + this.mMillisecField.value;
           }
 
+          if (time == this.mInputElement.value) {
+            return;
+          }
+
           this.log("setInputValueFromFields: " + time);
           this.mInputElement.setUserInput(time);
         ]]>
@@ -678,6 +721,9 @@
           if (!this.isEmpty(minute)) {
             this.setFieldValue(this.mMinuteField, minute);
           }
+
+          // Update input element's .value if needed.
+          this.setInputValueFromFields();
         ]]>
         </body>
        </method>
@@ -721,9 +767,11 @@
             this.mDayPeriodField.value = "";
           }
 
-          if (!aFromInputElement) {
+          if (!aFromInputElement && this.mInputElement.value) {
             this.mInputElement.setUserInput("");
           }
+
+          this.updateResetButtonVisibility();
         ]]>
         </body>
       </method>
@@ -793,6 +841,7 @@
               this.mDayPeriodField.value == this.mAMIndicator ?
                 this.mPMIndicator : this.mAMIndicator;
             this.mDayPeriodField.select();
+            this.updateResetButtonVisibility();
             this.setInputValueFromFields();
             return;
           }
@@ -850,6 +899,7 @@
               this.mDayPeriodField.value = this.mPMIndicator;
               this.mDayPeriodField.select();
             }
+            this.updateResetButtonVisibility();
             return;
           }
 
@@ -905,16 +955,30 @@
           }
 
           aField.value = value;
+          this.updateResetButtonVisibility();
         ]]>
         </body>
       </method>
 
-      <method name="isValueAvailable">
+      <method name="isAnyValueAvailable">
+        <parameter name="aForPicker"/>
         <body>
         <![CDATA[
+          let available = !this.isEmpty(this.mHourField.value) ||
+                          !this.isEmpty(this.mMinuteField.value);
+
+          if (available) {
+            return true;
+          }
+
           // Picker only cares about hour:minute.
-          return !this.isEmpty(this.mHourField.value) ||
-                 !this.isEmpty(this.mMinuteField.value);
+          if (aForPicker) {
+            return false;
+          }
+
+          return (this.mDayPeriodField && !this.isEmpty(this.mDayPeriodField.value)) ||
+                 (this.mSecondField && !this.isEmpty(this.mSecondField.value)) ||
+                 (this.mMillisecField && !this.isEmpty(this.mMillisecField.value));
         ]]>
         </body>
       </method>
@@ -963,7 +1027,8 @@
     <content>
       <html:div class="datetime-input-box-wrapper"
                 xbl:inherits="context,disabled,readonly">
-        <html:span>
+        <html:span class="datetime-input-edit-wrapper"
+                   anonid="edit-wrapper">
           <html:input anonid="input-one"
                       class="textbox-input datetime-input numeric"
                       size="2" maxlength="2"
@@ -980,9 +1045,8 @@
                       xbl:inherits="disabled,readonly,tabindex"/>
         </html:span>
 
-        <html:button class="datetime-reset-button" anoid="reset-button"
-                     tabindex="-1" xbl:inherits="disabled"
-                     onclick="document.getBindingParent(this).clearInputFields(false);"/>
+        <html:button class="datetime-reset-button" anonid="reset-button"
+                     tabindex="-1" xbl:inherits="disabled"/>
       </html:div>
     </content>
 
@@ -997,6 +1061,9 @@
         this.mStep = this.mInputElement.step;
         this.mIsPickerOpen = false;
 
+        this.mResetButton =
+          document.getAnonymousElementByAttribute(this, "anonid", "reset-button");
+
         this.EVENTS.forEach((eventName) => {
           this.addEventListener(eventName, this, { mozSystemGroup: true });
         });
@@ -1005,6 +1072,9 @@
           capture: true,
           mozSystemGroup: true
         });
+        // This is to close the picker when input element blurs.
+        this.mInputElement.addEventListener("blur", this,
+                                            { mozSystemGroup: true });
       ]]>
       </constructor>
 
@@ -1025,7 +1095,7 @@
       <property name="EVENTS" readonly="true">
         <getter>
         <![CDATA[
-          return ["click", "focus", "blur", "copy", "cut", "paste"];
+          return ["click", "focus", "blur", "copy", "cut", "paste", "mousedown"];
         ]]>
         </getter>
       </property>
@@ -1041,6 +1111,18 @@
         </body>
       </method>
 
+      <method name="updateResetButtonVisibility">
+        <body>
+          <![CDATA[
+            if (this.isAnyValueAvailable(false)) {
+              this.mResetButton.style.visibility = "visible";
+            } else {
+              this.mResetButton.style.visibility = "hidden";
+            }
+          ]]>
+        </body>
+      </method>
+
       <method name="focusInnerTextBox">
         <body>
         <![CDATA[
@@ -1164,10 +1246,16 @@
         </body>
       </method>
 
+      <method name="isAnyValueAvailable">
+        <body>
+          throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
+        </body>
+      </method>
+
       <method name="notifyPicker">
         <body>
         <![CDATA[
-          if (this.mIsPickerOpen && this.isValueAvailable()) {
+          if (this.mIsPickerOpen && this.isAnyValueAvailable(true)) {
             this.mInputElement.updateDateTimePicker(this.getCurrentValue());
           }
         ]]>
@@ -1213,6 +1301,12 @@
               this.onBlur(aEvent);
               break;
             }
+            case "mousedown": {
+              if (aEvent.originalTarget == this.mResetButton) {
+                aEvent.preventDefault();
+              }
+              break;
+            }
             case "copy":
             case "cut":
             case "paste": {
@@ -1245,7 +1339,12 @@
         <parameter name="aEvent"/>
         <body>
         <![CDATA[
-          this.log("onBlur originalTarget: " + aEvent.originalTarget);
+          this.log("onBlur originalTarget: " + aEvent.originalTarget +
+            " target: " + aEvent.target);
+
+          if (aEvent.target == this.mInputElement && this.mIsPickerOpen) {
+            this.mInputElement.closeDateTimePicker();
+          }
 
           let target = aEvent.originalTarget;
           target.setAttribute("typeBuffer", "");
@@ -1261,16 +1360,23 @@
           this.log("onKeyPress key: " + aEvent.key);
 
           switch (aEvent.key) {
-            // Close picker on Enter or Space key.
+            // Close picker on Enter, Escape or Space key.
             case "Enter":
+            case "Escape":
             case " ": {
-              this.mInputElement.closeDateTimePicker();
-              aEvent.preventDefault();
+              if (this.mIsPickerOpen) {
+                this.mInputElement.closeDateTimePicker();
+                aEvent.preventDefault();
+              }
               break;
             }
             case "Backspace": {
               let targetField = aEvent.originalTarget;
+              targetField.value = "";
               targetField.setAttribute("typeBuffer", "");
+              this.updateResetButtonVisibility();
+              this.setInputValueFromFields();
+              aEvent.preventDefault();
               break;
             }
             case "ArrowRight":
@@ -1312,12 +1418,14 @@
           // XXX: .originalTarget is not expected.
           // When clicking on one of the inner text boxes, the .originalTarget is
           // a HTMLDivElement and when clicking on the reset button, it's a
-          // HTMLButtonElement but it's not equal to our reset-button.
+          // HTMLButtonElement.
           if (aEvent.defaultPrevented || this.isDisabled() || this.isReadonly()) {
             return;
           }
 
-          if (!(aEvent.originalTarget instanceof HTMLButtonElement)) {
+          if (aEvent.originalTarget == this.mResetButton) {
+            this.clearInputFields(false);
+          } else if (!this.mIsPickerOpen) {
             this.mInputElement.openDateTimePicker(this.getCurrentValue());
           }
         ]]>
diff --git a/toolkit/content/widgets/datetimepicker.xml b/toolkit/content/widgets/datetimepicker.xml
index 5f16f1ff0..1d6a5e772 100644
--- a/toolkit/content/widgets/datetimepicker.xml
+++ b/toolkit/content/widgets/datetimepicker.xml
@@ -999,13 +999,13 @@
         <body>
           <![CDATA[
             var locale = Intl.DateTimeFormat().resolvedOptions().locale + "-u-ca-gregory";
-            var dtfMonth = Intl.DateTimeFormat(locale, {month: "long"});
+            var dtfMonth = Intl.DateTimeFormat(locale, {month: "long", timeZone: "UTC"});
             var dtfWeekday = Intl.DateTimeFormat(locale, {weekday: "narrow"});
 
             var monthLabel = this.monthField.firstChild;
-            var tempDate = new Date(2005, 0, 1);
+            var tempDate = new Date(Date.UTC(2005, 0, 1));
             for (var month = 0; month < 12; month++) {
-              tempDate.setMonth(month);
+              tempDate.setUTCMonth(month);
               monthLabel.setAttribute("value", dtfMonth.format(tempDate));
               monthLabel = monthLabel.nextSibling;
             }
diff --git a/toolkit/content/widgets/datetimepopup.xml b/toolkit/content/widgets/datetimepopup.xml
index 86e8780c1..52df7de75 100644
--- a/toolkit/content/widgets/datetimepopup.xml
+++ b/toolkit/content/widgets/datetimepopup.xml
@@ -22,11 +22,20 @@
       <field name="TIME_PICKER_HEIGHT" readonly="true">"21em"</field>
       <field name="DATE_PICKER_WIDTH" readonly="true">"23.1em"</field>
       <field name="DATE_PICKER_HEIGHT" readonly="true">"20.7em"</field>
-      <method name="loadPicker">
+      <constructor><![CDATA[
+        this.l10n = {};
+        const mozIntl = Components.classes["@mozilla.org/mozintl;1"]
+                          .getService(Components.interfaces.mozIMozIntl);
+        mozIntl.addGetCalendarInfo(l10n);
+        mozIntl.addGetDisplayNames(l10n);
+        // Notify DateTimePickerHelper.jsm that binding is ready.
+        this.dispatchEvent(new CustomEvent("DateTimePickerBindingReady"));
+      ]]></constructor>
+      <method name="openPicker">
         <parameter name="type"/>
+        <parameter name="anchor"/>
         <parameter name="detail"/>
         <body><![CDATA[
-          this.hidden = false;
           this.type = type;
           this.pickerState = {};
           // TODO: Resize picker according to content zoom level
@@ -49,17 +58,20 @@
               break;
             }
           }
+          this.hidden = false;
+          this.openPopup(anchor, "after_start", 0, 0);
         ]]></body>
       </method>
       <method name="closePicker">
         <body><![CDATA[
-          this.hidden = true;
           this.setInputBoxValue(true);
           this.pickerState = {};
           this.type = undefined;
           this.dateTimePopupFrame.removeEventListener("load", this, true);
           this.dateTimePopupFrame.contentDocument.removeEventListener("message", this, false);
           this.dateTimePopupFrame.setAttribute("src", "");
+          this.hidePopup();
+          this.hidden = true;
         ]]></body>
       </method>
       <method name="setPopupValue">
@@ -115,6 +127,34 @@
             }
             case "date": {
               const { year, month, day } = detail.value;
+              const { firstDayOfWeek, weekends } =
+                this.getCalendarInfo(locale);
+              const monthStrings = this.getDisplayNames(
+                locale, [
+                  "dates/gregorian/months/january",
+                  "dates/gregorian/months/february",
+                  "dates/gregorian/months/march",
+                  "dates/gregorian/months/april",
+                  "dates/gregorian/months/may",
+                  "dates/gregorian/months/june",
+                  "dates/gregorian/months/july",
+                  "dates/gregorian/months/august",
+                  "dates/gregorian/months/september",
+                  "dates/gregorian/months/october",
+                  "dates/gregorian/months/november",
+                  "dates/gregorian/months/december",
+                ], "short");
+              const weekdayStrings = this.getDisplayNames(
+                locale, [
+                  "dates/gregorian/weekdays/sunday",
+                  "dates/gregorian/weekdays/monday",
+                  "dates/gregorian/weekdays/tuesday",
+                  "dates/gregorian/weekdays/wednesday",
+                  "dates/gregorian/weekdays/thursday",
+                  "dates/gregorian/weekdays/friday",
+                  "dates/gregorian/weekdays/saturday",
+                ], "short");
+
               this.postMessageToPicker({
                 name: "PickerInit",
                 detail: {
@@ -122,7 +162,13 @@
                   // Month value from input box starts from 1 instead of 0
                   month: month == undefined ? undefined : month - 1,
                   day,
-                  locale
+                  firstDayOfWeek,
+                  weekends,
+                  monthStrings,
+                  weekdayStrings,
+                  locale,
+                  min: detail.min,
+                  max: detail.max,
                 }
               });
               break;
@@ -184,6 +230,46 @@
           }
         ]]></body>
       </method>
+      <method name="getCalendarInfo">
+        <parameter name="locale"/>
+        <body><![CDATA[
+          const calendarInfo = this.l10n.getCalendarInfo(locale);
+
+          // Day of week from calendarInfo starts from 1 as Sunday to 7 as Saturday,
+          // so they need to be mapped to JavaScript convention with 0 as Sunday
+          // and 6 as Saturday
+          let firstDayOfWeek = calendarInfo.firstDayOfWeek - 1,
+              weekendStart = calendarInfo.weekendStart - 1,
+              weekendEnd = calendarInfo.weekendEnd - 1;
+
+          let weekends = [];
+
+          // Make sure weekendEnd is greater than weekendStart
+          if (weekendEnd < weekendStart) {
+            weekendEnd += 7;
+          }
+
+          // We get the weekends by incrementing weekendStart up to weekendEnd.
+          // If the start and end is the same day, then weekends only has one day.
+          for (let day = weekendStart; day <= weekendEnd; day++) {
+            weekends.push(day % 7);
+          }
+
+          return {
+            firstDayOfWeek,
+            weekends
+          }
+        ]]></body>
+      </method>
+      <method name="getDisplayNames">
+        <parameter name="locale"/>
+        <parameter name="keys"/>
+        <parameter name="style"/>
+        <body><![CDATA[
+          const displayNames = this.l10n.getDisplayNames(locale, {keys, style});
+          return keys.map(key => displayNames.values[key]);
+        ]]></body>
+      </method>
       <method name="handleEvent">
         <parameter name="aEvent"/>
         <body><![CDATA[
@@ -230,12 +316,5 @@
       </method>
 
     </implementation>
-    <handlers>
-      <handler event="popuphiding">
-        <![CDATA[
-          this.closePicker();
-        ]]>
-      </handler>
-    </handlers>
   </binding>
 </bindings>
diff --git a/toolkit/content/widgets/spinner.js b/toolkit/content/widgets/spinner.js
index 059e151fc..6ef929f8a 100644
--- a/toolkit/content/widgets/spinner.js
+++ b/toolkit/content/widgets/spinner.js
@@ -299,11 +299,11 @@ function Spinner(props, context) {
             // An "active" class is needed to simulate :active pseudo-class
             // because element is not focused.
             event.target.classList.add("active");
-            this._smoothScrollToIndex(index + 1);
+            this._smoothScrollToIndex(index - 1);
           }
           if (event.target == down) {
             event.target.classList.add("active");
-            this._smoothScrollToIndex(index - 1);
+            this._smoothScrollToIndex(index + 1);
           }
           if (event.target.parentNode == spinner) {
             // Listen to dragging events