Java Utililty Methods Calendar Adjust

List of utility methods to do Calendar Adjust

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Description

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

Method

voidadjustCalendar(Calendar calendar)
adjust Calendar 
if (calendar.get(Calendar.HOUR_OF_DAY) != 0) {
    if (calendar.get(Calendar.HOUR_OF_DAY) == 1)
        calendar.setTimeInMillis(calendar.getTimeInMillis() - MILLISECONDS_PER_HOUR);
    if (calendar.get(Calendar.HOUR_OF_DAY) == 23)
        calendar.setTimeInMillis(calendar.getTimeInMillis() + MILLISECONDS_PER_HOUR);
voidadjustCalendarToLocalTime(Calendar cal)
Needed to rectify the interpretation of timestamp values in calendar objects. 
Date date = cal.getTime();
TimeZone tz = TimeZone.getTimeZone("CET");
long msFromEpochGmt = date.getTime(); 
int offsetFromUTC = tz.getOffset(msFromEpochGmt);
cal.setTimeInMillis(msFromEpochGmt + offsetFromUTC);
CalendaradjustDate(Calendar calendar, int differenceInDay)
Adjusts the Calendar to several days before or after the current date. 
calendar.setTimeInMillis(calendar.getTimeInMillis() + DAY_IN_MS * differenceInDay);
return calendar;
longadjustedMillis(Calendar cal)
Gets the time in milliseconds from a Calendar, adjusting for timezone so that day subtraction works properly. 
return cal.getTimeInMillis() + cal.getTimeZone().getOffset(cal.getTimeInMillis());
voidadjustToDayEnd(Calendar cal)
Set the hours, minutes, seconds and milliseconds so the calendar represents midnight minus one milli-second. 
cal.set(Calendar.HOUR_OF_DAY, 23);
cal.set(Calendar.MINUTE, 59);
cal.set(Calendar.SECOND, 59);
cal.set(Calendar.MILLISECOND, 999);
voidadjustToFieldStart(Calendar cal, int[] fields)
Set the calendar fields in the array to their actual (Considering the current Calendar time) minimum. 
for (int i = 0; i < fields.length; i++) {
    int f = fields[i];
    if (f == Calendar.DAY_OF_WEEK_IN_MONTH) {
        cal.get(Calendar.DAY_OF_WEEK);
        cal.set(Calendar.DAY_OF_WEEK, cal.getFirstDayOfWeek());
    } else {
        cal.set(f, cal.getActualMinimum(f));
voidadjustToMonthStart(Calendar cal)
Adjust a Date to the start of the month (and start of the day). 
cal.set(Calendar.DAY_OF_MONTH, 1);
CalendargetMidnightCalendarByUnadjustedDate(Date date, TimeZone timezone)
get Midnight Calendar By Unadjusted Date 
Calendar cal = Calendar.getInstance();
cal.setTime(date);
Calendar mcal = getMidnightCalendarInstance(timezone);
mcal.set(Calendar.DAY_OF_MONTH, cal.get(Calendar.DAY_OF_MONTH));
mcal.set(Calendar.MONTH, cal.get(Calendar.MONTH));
mcal.set(Calendar.YEAR, cal.get(Calendar.YEAR));
return mcal;
voidtruncCalendarToWeek(Calendar c, int adjustIncrement)
trunc Calendar To Week 
truncCalendarToWeek(c, adjustIncrement, Calendar.getInstance().getFirstDayOfWeek());
voidtruncCalendarToWeek(Calendar c, int adjustIncrement)
truncate the calendar to week 
if (adjustIncrement < -1) {
    adjustIncrement = -1;
if (adjustIncrement > 1) {
    adjustIncrement = 1;
if (adjustIncrement == 0) {
    adjustIncrement = -1;
...