Java Utililty Methods Calendar Create

List of utility methods to do Calendar Create

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Description

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

Method

IntegergetCalendarField(Date date, int calFieldId)
Shortcut function that returns the given Calendar field for the date 
if (date != null) {
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    return cal.get(calFieldId);
return null;
StringgetCalendarFieldName(int field)
get Calendar Field Name 
switch (field) {
case Calendar.DAY_OF_MONTH:
    return "DAY_OF_MONTH";
case Calendar.DAY_OF_WEEK:
    return "DAY_OF_WEEK";
case Calendar.DAY_OF_YEAR:
    return "DAY_OF_YEAR";
case Calendar.HOUR:
...
CalendargetCalendarFormYear(int year)
get Calendar of given year 
Calendar cal = Calendar.getInstance();
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
cal.set(Calendar.YEAR, year);
return cal;
GregorianCalendargetCalendarForNextRun(GregorianCalendar startTime, int targetDay, int targetHour)
Given a start time, computes the next time when the wallclock will reach a certain hour of the day, on a certain day of the week Eg: From today, when is the next Saturday, 12PM ? 
long startTimeMs = startTime.getTimeInMillis();
GregorianCalendar cal = new GregorianCalendar();
cal.setTimeInMillis(startTimeMs);
cal.set(Calendar.HOUR_OF_DAY, targetHour);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
if (cal.get(Calendar.DAY_OF_WEEK) != targetDay || cal.getTimeInMillis() < startTimeMs) {
...
CalendargetCalendarForSchedule(Calendar cal)
get Calendar For Schedule 
return cal;
CalendargetCalendarForTime(final long timeInMilliseconds)
Function to return a calendar object holding the UTC representation of the current time. 
Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
calendar.setTimeInMillis(timeInMilliseconds);
return calendar;
CalendargetCalendarFromDates(Date date, Date hourMinuteMillisseconds)
Merge two Date variables to compose a single Calendar object. 
Calendar ret = Calendar.getInstance();
ret.setTime(date);
Calendar hour = Calendar.getInstance();
hour.setTime(hourMinuteMillisseconds);
ret.set(Calendar.HOUR_OF_DAY, hour.get(Calendar.HOUR_OF_DAY));
ret.set(Calendar.MINUTE, hour.get(Calendar.MINUTE));
ret.set(Calendar.SECOND, hour.get(Calendar.SECOND));
ret.set(Calendar.MILLISECOND, hour.get(Calendar.MILLISECOND));
...
CalendargetCalendarFromSystemTimeInMillis(long date)
get Calendar From System Time In Millis 
Calendar calendar = new GregorianCalendar();
calendar.setTimeInMillis(date);
return calendar;
CalendargetCalendarGMT()
get Calendar GMT 
Calendar c = Calendar.getInstance();
c.setTimeZone(TimeZone.getTimeZone("GMT"));
return c;
CalendargetCalendarInstance()
Get a new calendar instance from UTC timezone 
return Calendar.getInstance(UTC_TIMEZONE);