Java Utililty Methods Calendar Time

List of utility methods to do Calendar Time

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Description

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

Method

CalendargetTimeZoneCalendar(final TimeZone timeZone)
get Time Zone Calendar 
return TIMEZONE_CALENDARS.get().computeIfAbsent(timeZone, GregorianCalendar::new);
StringgetTimezoneString(Calendar cal)
get Timezone String 
int tzoffset = (cal.get(Calendar.ZONE_OFFSET) + cal.get(Calendar.DST_OFFSET)) / 60000;
char tzsign = tzoffset > 0 ? '+' : '-';
tzoffset = Math.abs(tzoffset);
StringBuilder sb = new StringBuilder(5);
sb.append(tzsign);
append2DigitNumber(sb, tzoffset / 60);
append2DigitNumber(sb, tzoffset % 60);
return sb.toString();
...
booleanhasTime(Calendar cal)
Method to check whether hour, minute, second and millisecond fields are set 
boolean hasTime = cal.isSet(Calendar.HOUR_OF_DAY) && cal.isSet(Calendar.MINUTE)
        && cal.isSet(Calendar.SECOND) && cal.isSet(Calendar.MILLISECOND);
return hasTime;
booleanhasTimePart(Calendar calendar)
Whether the calendar has time part 
return calendar.get(Calendar.HOUR_OF_DAY) > 0 || calendar.get(Calendar.MINUTE) > 0
        || calendar.get(Calendar.SECOND) > 0;
booleanisEquals(Calendar startTime, Calendar timeCurrent, int type)
is Equals 
if (startTime == null || timeCurrent == null) {
    return false;
if (startTime.get(Calendar.YEAR) == timeCurrent.get(Calendar.YEAR)) {
    if (type == Calendar.YEAR) {
        return true;
    if (startTime.get(Calendar.WEEK_OF_YEAR) == timeCurrent.get(Calendar.WEEK_OF_YEAR)) {
...
booleanisFirstMorning(Calendar time, Calendar previous)
Tests if this will be the first good morning trigger for a message. 
if (time == null || previous == null) {
    return false;
if (time.get(Calendar.YEAR) == previous.get(Calendar.YEAR)
        && time.get(Calendar.DAY_OF_YEAR) == previous.get(Calendar.DAY_OF_YEAR)
        && previous.get(Calendar.HOUR_OF_DAY) >= 6) {
    return false;
return true;
booleanisFuture(Calendar time)
is Future 
if (time != null) {
    Calendar cal = getCalendar();
    cal.add(Calendar.WEEK_OF_MONTH, 2);
    snapStartOfWorkWeek(cal);
    return time.compareTo(cal) > -1;
return false;
booleanisMorning(Calendar time)
Tests if a time is during the morning. 
if (time == null) {
    return false;
int hour = time.get(Calendar.HOUR_OF_DAY);
return hour >= 6 && hour <= 10;
booleanisOverTime(Calendar lastTime, Calendar currentTime, Calendar begTime, Calendar endTime)
is Over Time 
return isOverTime(lastTime.getTimeInMillis(), currentTime.getTimeInMillis(), begTime.getTimeInMillis(),
        endTime.getTimeInMillis());
booleanisSameLocalTime(Calendar cal1, Calendar cal2)
is Same Local Time 
if ((cal1 == null) || (cal2 == null)) {
    throw new IllegalArgumentException("The date must not be null");
return (cal1.get(14) == cal2.get(14)) && (cal1.get(13) == cal2.get(13)) && (cal1.get(12) == cal2.get(12))
        && (cal1.get(10) == cal2.get(10)) && (cal1.get(6) == cal2.get(6)) && (cal1.get(1) == cal2.get(1))
        && (cal1.get(0) == cal2.get(0)) && (cal1.getClass() == cal2.getClass());