Java Utililty Methods TimeZone

List of utility methods to do TimeZone

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Description

The list of methods to do TimeZone are organized into topic(s).

Method

intgetTimezoneOffsetInHours(Date date)
Gets the timezone offset in hours. 
int x = getTimezoneOffsetInMinutes(date);
int inHours = x / 60;
return inHours;
booleanhasTimeComponent(Date date, TimeZone timeZone)
has Time Component 
final Calendar cal = Calendar.getInstance();
cal.setTimeZone(timeZone);
cal.setTime(date);
cal.getTime();
return (cal.get(Calendar.HOUR_OF_DAY) != 0) || (cal.get(Calendar.MINUTE) != 0);
Datemidnight(Date date, TimeZone tz)
Calculates midnight of the day in which date lies with respect to a time zone. 
Calendar cal = new GregorianCalendar(tz);
cal.setTime(date);
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
return cal.getTime();
CalendarmonthOfYear(Date referenceDate, int month, TimeZone timeZone)
Utility function to get the start of the month as a Calendar. 
Calendar c1 = Calendar.getInstance(timeZone);
c1.setTime(referenceDate);
Calendar c2 = Calendar.getInstance(timeZone);
c2.clear();
c2.set(c1.get(Calendar.YEAR), month - 1, 1);
return c2;
DatenormalizeDate(Date date, TimeZone timeZone)
normalize Date 
Calendar calendar = new GregorianCalendar(timeZone);
calendar.setTime(date);
calendar.set(Calendar.AM_PM, Calendar.AM);
calendar.set(Calendar.HOUR, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0);
return calendar.getTime();
...
DatestartOfNextDay(final Date date, final TimeZone timeZone)
start Of Next Day 
final Calendar cal = Calendar.getInstance(timeZone);
cal.setTime(date);
cal.add(Calendar.DATE, 1);
cal.set(Calendar.HOUR, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 1);
return cal.getTime();
CalendarstartOfYear(Date referenceDate, TimeZone timeZone)
Calculate the date at the start of the year for the given date. 
Calendar c1 = Calendar.getInstance(timeZone);
c1.setTime(referenceDate);
Calendar c2 = Calendar.getInstance(timeZone);
c2.clear();
c2.set(c1.get(Calendar.YEAR), 0, 1);
return c2;
LongtoEpoch(Date dateTime, String timeZone)
to Epoch 
Calendar timeOffset = Calendar.getInstance(TimeZone.getTimeZone(timeZone));
timeOffset.set(Calendar.MILLISECOND, 0);
timeOffset.set(Calendar.SECOND, 0);
timeOffset.set(Calendar.MINUTE, 0);
timeOffset.set(Calendar.HOUR_OF_DAY, 0);
long midnightOffSet = timeOffset.getTime().getTime();
long localTimestamp = dateTime.getTime();
return timeOffset == null ? null : midnightOffSet + localTimestamp;
...