2 files changed, 12 insertions, 26 deletions

diff --git a/toolkit/content/widgets/timekeeper.js b/toolkit/content/widgets/timekeeper.js
index 2234c9e50..3b4e7eb0a 100644
--- a/toolkit/content/widgets/timekeeper.js
+++ b/toolkit/content/widgets/timekeeper.js
@@ -14,7 +14,7 @@
  *        {
  *          {Date} min
  *          {Date} max
- *          {Number} stepInMs
+ *          {Number} step
  *          {String} format: Either "12" or "24"
  *        }
  */
@@ -286,15 +286,15 @@ function TimeKeeper(props) {
      *         }
      */
     _getSteps(startValue, endValue, minStep, formatter) {
-      const { min, max, stepInMs } = this.props;
+      const { min, max, step } = this.props;
       // The timeStep should be big enough so that there won't be
       // duplications. Ex: minimum step for minute should be 60000ms,
       // if smaller than that, next step might return the same minute.
-      const timeStep = Math.max(minStep, stepInMs);
+      const timeStep = Math.max(minStep, step);
 
       // Make sure the starting point and end point is not off step
       let time = min.valueOf() + Math.ceil((startValue - min.valueOf()) / timeStep) * timeStep;
-      let maxValue = min.valueOf() + Math.floor((max.valueOf() - min.valueOf()) / stepInMs) * stepInMs;
+      let maxValue = min.valueOf() + Math.floor((max.valueOf() - min.valueOf()) / step) * step;
       let steps = [];
 
       // Increment by timeStep until reaching the end of the range.
@@ -410,9 +410,9 @@ function TimeKeeper(props) {
      * @return {Boolean}
      */
     _isOffStep(time) {
-      const { min, stepInMs } = this.props;
+      const { min, step } = this.props;
 
-      return (time.valueOf() - min.valueOf()) % stepInMs != 0;
+      return (time.valueOf() - min.valueOf()) % step != 0;
     }
   };
 }
diff --git a/toolkit/content/widgets/timepicker.js b/toolkit/content/widgets/timepicker.js
index 8c2fb89dd..1f0463fe4 100644
--- a/toolkit/content/widgets/timepicker.js
+++ b/toolkit/content/widgets/timepicker.js
@@ -13,8 +13,6 @@ function TimePicker(context) {
   const debug = 0 ? console.log.bind(console, "[timepicker]") : function() {};
 
   const DAY_PERIOD_IN_HOURS = 12,
-        SECOND_IN_MS = 1000,
-        MINUTE_IN_MS = 60000,
         DAY_IN_MS = 86400000;
 
   TimePicker.prototype = {
@@ -24,9 +22,9 @@ function TimePicker(context) {
      *         {
      *           {Number} hour [optional]: Hour in 24 hours format (0~23), default is current hour
      *           {Number} minute [optional]: Minute (0~59), default is current minute
-     *           {String} min [optional]: Minimum time, in 24 hours format. ex: "05:45"
-     *           {String} max [optional]: Maximum time, in 24 hours format. ex: "23:00"
-     *           {Number} step [optional]: Step size in minutes. Default is 60.
+     *           {Number} min: Minimum time, in ms
+     *           {Number} max: Maximum time, in ms
+     *           {Number} step: Step size in ms
      *           {String} format [optional]: "12" for 12 hours, "24" for 24 hours format
      *           {String} locale [optional]: User preferred locale
      *         }
@@ -51,11 +49,10 @@ function TimePicker(context) {
       let timerHour = hour == undefined ? now.getHours() : hour;
       let timerMinute = minute == undefined ? now.getMinutes() : minute;
 
-      // The spec defines 1 step == 1 second, need to convert to ms for timekeeper
       let timeKeeper = new TimeKeeper({
-        min: this._parseTimeString(min) || new Date(0),
-        max: this._parseTimeString(max) || new Date(DAY_IN_MS - 1),
-        stepInMs: step ? step * SECOND_IN_MS : MINUTE_IN_MS,
+        min: new Date(Number.isNaN(min) ? 0 : min),
+        max: new Date(Number.isNaN(max) ? DAY_IN_MS - 1 : max),
+        step,
         format: format || "12"
       });
       timeKeeper.setState({ hour: timerHour, minute: timerMinute });
@@ -64,17 +61,6 @@ function TimePicker(context) {
     },
 
     /**
-     * Convert a time string from DOM attribute to a date object.
-     *
-     * @param  {String} timeString: (ex. "10:30", "23:55", "12:34:56.789")
-     * @return {Date/Boolean} Date object or false if date is invalid.
-     */
-    _parseTimeString(timeString) {
-      let time = new Date("1970-01-01T" + timeString + "Z");
-      return time.toString() == "Invalid Date" ? false : time;
-    },
-
-    /**
      * Initalize the spinner components.
      */
     _createComponents() {