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/*
* 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/.
*/
package org.mozilla.gecko.util;
import android.support.annotation.NonNull;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import java.util.concurrent.TimeUnit;
/**
* Utilities to help with manipulating Java's dates and calendars.
*/
public class DateUtil {
private DateUtil() {}
/**
* @param date the date to convert to HTTP format
* @return the date as specified in rfc 1123, e.g. "Tue, 01 Feb 2011 14:00:00 GMT"
*/
public static String getDateInHTTPFormat(@NonNull final Date date) {
final DateFormat df = new SimpleDateFormat("E, dd MMM yyyy HH:mm:ss z", Locale.US);
df.setTimeZone(TimeZone.getTimeZone("GMT"));
return df.format(date);
}
/**
* Returns the timezone offset for the current date in minutes. See
* {@link #getTimezoneOffsetInMinutesForGivenDate(Calendar)} for more details.
*/
public static int getTimezoneOffsetInMinutes(@NonNull final TimeZone timezone) {
return getTimezoneOffsetInMinutesForGivenDate(Calendar.getInstance(timezone));
}
/**
* Returns the time zone offset for the given date in minutes. The date makes a difference due to daylight
* savings time in some regions. We return minutes because we can accurately represent time zones that are
* offset by non-integer hour values, e.g. parts of New Zealand at UTC+12:45.
*
* @param calendar A calendar with the appropriate time zone & date already set.
*/
public static int getTimezoneOffsetInMinutesForGivenDate(@NonNull final Calendar calendar) {
// via Date.getTimezoneOffset deprecated docs (note: it had incorrect order of operations).
// Also, we cast to int because we should never overflow here - the max should be GMT+14 = 840.
return (int) TimeUnit.MILLISECONDS.toMinutes(calendar.get(Calendar.ZONE_OFFSET) + calendar.get(Calendar.DST_OFFSET));
}
}
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