Java Utililty Methods Date Calculate

List of utility methods to do Date Calculate

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Description

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

Method

DatecalculateDate(Date date, int field, int value)
calculate Date 
Calendar c = Calendar.getInstance();
c.setTime(date);
c.add(field, value);
return c.getTime();
intcalculateDays(Date startDate, Date endDate)
calculate Days 
int presumedDays = 0;
Calendar startCal = Calendar.getInstance();
startCal.setTime(startDate);
Calendar endCal = Calendar.getInstance();
endCal.setTime(endDate);
if (startCal.getTimeInMillis() == endCal.getTimeInMillis()) {
    return 0;
while (startCal.before(endDate)) {
    startCal.add(Calendar.DAY_OF_MONTH, 1);
    presumedDays++;
return presumedDays;
DatecalculateDurationEndInSec(Date start, int durationInSeconds)
calculate Duration End In Sec 
Calendar cal = Calendar.getInstance();
cal.setTime(start);
cal.add(Calendar.SECOND, durationInSeconds);
return new Date(cal.getTimeInMillis());
DatecalculateEndDate(Date startDate, int duration)
calculate End Date 
Calendar startCal = Calendar.getInstance();
startCal.setTime(startDate);
for (int i = 1; i < duration; i++) {
    startCal.add(Calendar.DAY_OF_MONTH, 1);
    while (startCal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY
            || startCal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) {
        startCal.add(Calendar.DAY_OF_MONTH, 1);
return startCal.getTime();
intcalculateGestationAge(Date today, Date edd)
calculate Gestation Age 
int i = 40;
Calendar calendar = Calendar.getInstance();
calendar.setTime(edd);
if (today.before(edd)) {
    while (today.before(calendar.getTime()) || today.equals(calendar.getTime())) {
        i--;
        calendar.add(Calendar.DAY_OF_YEAR, -7);
        if (i < 0) {
...
DatecalculateLookbackDate(int lookback)
calculate Lookback Date 
Date dayCounter = new Date();
int validDatesCounter = lookback;
while (validDatesCounter > 0) {
    dayCounter.setDate(dayCounter.getDate() - 1);
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(dayCounter);
    if (calendar.get(Calendar.DAY_OF_WEEK) != Calendar.SATURDAY
            && calendar.get(Calendar.DAY_OF_WEEK) != Calendar.SUNDAY && !holidayList.contains(dayCounter)) {
...
intcalculateMonthIn(Date date1, Date date2)
calculate Month In 
Calendar cal1 = new GregorianCalendar();
cal1.setTime(date1);
Calendar cal2 = new GregorianCalendar();
cal2.setTime(date2);
int c = (cal1.get(Calendar.YEAR) - cal2.get(Calendar.YEAR)) * 12 + cal1.get(Calendar.MONTH)
        - cal2.get(Calendar.MONTH);
return Math.abs(c);
DatecalculateNextSettleDate(Date date, int addMonth)
calculate Next Settle Date 
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int dayOfMonth = calendar.get(Calendar.DAY_OF_MONTH);
int maxOfMonth = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
if (dayOfMonth == maxOfMonth) {
    calendar.add(Calendar.MONTH, addMonth);
    maxOfMonth = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
    calendar.set(Calendar.DAY_OF_MONTH, maxOfMonth);
...
LongcalculateOffsetFromGMT(Date date)
Calculates a date time offset from GMT. 
Calendar cal = Calendar.getInstance();
long offset = cal.getTimeZone().getOffset(date.getTime());
return offset;
DatecalculatePastDate(int days)
Returns date in history: Today - the given number of days 
final Calendar cal = Calendar.getInstance();
cal.add(Calendar.DATE, -days);
return cal.getTime();