Java Utililty Methods Calendar Calculate

List of utility methods to do Calendar Calculate

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Description

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

Method

CalendaraddQuarter(Calendar calendar, int quarterDelta)
Add quarter to current 
int month = calendar.get(Calendar.MONTH);
int quarter = month / 3;
Calendar startMonth = new GregorianCalendar(calendar.get(Calendar.YEAR), quarter * 3, 1);
startMonth.add(Calendar.MONTH, quarterDelta * 3);
return startMonth;
longaddTime(int calendarType, long time, int number)
add Time 
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(time);
cal.add(calendarType, number);
return cal.getTimeInMillis();
CalendaralignHours(int interval, Calendar timestamp)
Aligns the time fields to the start of given interval. 
int value = timestamp.get(Calendar.HOUR_OF_DAY);
value = value - (value % interval);
timestamp.set(Calendar.HOUR_OF_DAY, value);
return alignHour(timestamp);
CalendaralignSecond(Calendar timestamp)
Aligns the time fields to the start of the second. 
timestamp.set(Calendar.MILLISECOND, 0);
return timestamp;
Stringcal2Str(Calendar pCal)

Gets string representation of given Calendar.

StringBuffer str = new StringBuffer();
if (pCal != null) {
    int month = pCal.get(Calendar.MONTH) + 1;
    int date = pCal.get(Calendar.DATE);
    int year = pCal.get(Calendar.YEAR);
    str.append(month);
    str.append("/" + date);
    str.append("/" + year);
...
intcalcAge(Calendar dateOfBirth, Calendar now)
Calculates the age if date of birth is given (for a calendar time stamp) 
int age = now.get(Calendar.YEAR) - dateOfBirth.get(Calendar.YEAR);
int nowM = now.get(Calendar.MONTH);
int dobM = dateOfBirth.get(Calendar.MONTH);
int nowDOM = now.get(Calendar.DAY_OF_MONTH);
int dobDOM = dateOfBirth.get(Calendar.DAY_OF_MONTH);
if ((nowM < dobM) || ((nowM == dobM) && (nowDOM < dobDOM))) {
    age--;
if (age < 0) {
    throw new IllegalArgumentException("Calculated age results in negative value.");
return age;
IntegercalcDifferenceAsDays(Calendar aBaseDate, Calendar aTargetDate)
calc Difference As Days 
long tDifference = aTargetDate.getTimeInMillis() - aBaseDate.getTimeInMillis();
return (int) (tDifference / 86400000);
intcalcDifferenceAsYearsPrivate(Calendar aBaseDate, Calendar aTargetDate)
calc Difference As Years Private 
int tBaseDateMonth = aBaseDate.get(Calendar.MONTH);
int tTargetDateMonth = aTargetDate.get(Calendar.MONTH);
return aTargetDate.get(Calendar.YEAR) - aBaseDate.get(Calendar.YEAR)
        - (tBaseDateMonth > tTargetDateMonth || (tBaseDateMonth == tTargetDateMonth
                && aBaseDate.get(Calendar.DATE) > aTargetDate.get(Calendar.DATE)) ? 1 : 0);
longcalcTime(Date end, Date start, int calendarField)
calc Time 
if (end == null || start == null)
    return 0;
long diff = end.getTime() - start.getTime();
switch (calendarField) {
case Calendar.MILLISECOND:
    return diff;
case Calendar.SECOND:
    return diff / 1000;
...
StringcalcTimezone(Calendar cal)
calc Timezone 
Date date = cal.getTime();
TimeZone z = cal.getTimeZone();
int tz = z.getRawOffset();
if (z.inDaylightTime(date)) {
    int tzDst = z.getDSTSavings();
    tz = tz + tzDst;
String sign = "+";
...