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

DatecalculateTime(Date date, String addpart, int num)
calculate Time 
GregorianCalendar cal = new GregorianCalendar();
cal.setTime(date);
if (addpart.equalsIgnoreCase("Y")) {
    cal.add(Calendar.YEAR, num);
} else if (addpart.equalsIgnoreCase("M")) {
    cal.add(Calendar.MONTH, num);
} else if (addpart.equalsIgnoreCase("D")) {
    cal.add(Calendar.DATE, num);
...
StringcalculateTime(Date sendTime, String timeZoneID)
calculate Time 
if (sendTime == null) {
    return "NOW";
} else {
    long date = sendTime.getTime();
    TimeZone tz = TimeZone.getTimeZone(timeZoneID);
    date -= tz.getRawOffset();
    if (tz.inDaylightTime(sendTime)) {
        date -= 3600 * 1000;
...
StringcalculateTimestamp()
This method is used to calculate the current timestamp of a request. 
Calendar cal = new GregorianCalendar();
sdf.setTimeZone(cal.getTimeZone());
return sdf.format(cal.getTime());
intcalculateTruncatedTime(final Date dateTimeBegin, final Date dateTimeEnd, final Date begin, final Date end)
Calculate quantity of minutes of task. 
if (begin.compareTo(end) > 0) {
    final Calendar calendarBegin1 = new GregorianCalendar();
    calendarBegin1.setTime(begin);
    calendarBegin1.set(Calendar.HOUR_OF_DAY, 0);
    calendarBegin1.set(Calendar.MINUTE, 0);
    calendarBegin1.set(Calendar.SECOND, 0);
    final Calendar calendarEnd2 = new GregorianCalendar();
    calendarEnd2.setTime(calendarBegin1.getTime());
...
intcalculateTruncatedTimeByDays(final Date dateTimeStart, final Date dateTimeEnd, final Date start, final Date end)
Retrieves time of activity on period. 
int minutes = 0;
final Date startActivity = new Date(dateTimeStart.getTime());
final Date endActivity = new Date(dateTimeEnd.getTime());
final Date periodBegin = new Date(start.getTime());
final Date periodEnd = new Date(end.getTime());
if (startActivity.compareTo(endActivity) < 0) {
    final Calendar calendarBegin = new GregorianCalendar();
    calendarBegin.setTime(periodBegin);
...
intcalculationAge(Date birthday, Date calculateDay)
calculation Age 
@SuppressWarnings("unused")
int day = 1, month = 0, year = 1, ageYears, ageMonths, ageDays;
Calendar calculate = Calendar.getInstance();
calculate.setTime(calculateDay);
Calendar birth = Calendar.getInstance();
birth.setTime(birthday);
try {
    year = birth.get(Calendar.YEAR);
...
DategetDateCalculate(int d)
get Date Calculate 
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.DATE, d);
return calendar.getTime();