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

CalendarnewCalendarInstance(TimeZone timeZone)
new Calendar Instance 
Calendar calendar = Calendar.getInstance(timeZone);
return calendar;
longnormalizeLocalTime(final Calendar cal)
Normalize cal so that any Calendar with the same local time have the same result. 
return cal.getTimeInMillis() + cal.getTimeZone().getOffset(cal.getTimeInMillis());
longparseTime(Calendar calendar, String time_string)
parse Time 
String[] parts = time_string.split("[/ :]");
int day = Integer.parseInt(parts[0]);
int month = stringToMonth(parts[1]);
int year = Integer.parseInt(parts[2]);
int hours = Integer.parseInt(parts[3]);
int minutes = Integer.parseInt(parts[4]);
int seconds = Integer.parseInt(parts[5]);
calendar.set(year, month, day, hours, minutes, seconds);
...
longparseTime(String time, Calendar calendar)
Parses a time string in the format [Tt]HH:MM:SS(.[0-9]+)? 
if (time.length() < MIN_TIME_STRING_LENGTH) {
    throw new NumberFormatException();
long timeZoneOffset = 0;
char first = time.charAt(0);
if (time.length() < MIN_TIME_STRING_LENGTH || (first != 'T' && first != 't')) {
    throw new NumberFormatException();
time = time.substring(1);
int value = Integer.parseInt(time.substring(0, 2));
if (value > 23) {
    throw new NumberFormatException();
calendar.set(Calendar.HOUR_OF_DAY, value);
if (time.charAt(2) == ':') {
    time = time.substring(3);
} else {
    time = time.substring(2);
value = Integer.parseInt(time.substring(0, 2));
if (value > 59) {
    throw new NumberFormatException();
calendar.set(Calendar.MINUTE, value);
if (time.charAt(2) == ':') {
    time = time.substring(3);
} else {
    time = time.substring(2);
value = Integer.parseInt(time.substring(0, 2));
if (value > 59) {
    throw new NumberFormatException();
calendar.set(Calendar.SECOND, value);
time = time.substring(2);
calendar.set(Calendar.MILLISECOND, 0);
if (time.length() > 0) {
    try {
        int currentStringPos = 0;
        if (time.charAt(currentStringPos) == '.') {
            ++currentStringPos;
            if (!Character.isDigit(time.charAt(currentStringPos))) {
                throw new NumberFormatException();
            int multiplier = 100;
            int milliseconds = Character.digit(time.charAt(currentStringPos), 10) * multiplier;
            ++currentStringPos;
            while (currentStringPos < time.length() && Character.isDigit(time.charAt(currentStringPos))) {
                multiplier /= 10;
                milliseconds += Character.digit(time.charAt(currentStringPos), 10) * multiplier;
                currentStringPos++;
            calendar.set(Calendar.MILLISECOND, milliseconds);
        if (currentStringPos < time.length()) {
            String timezone = time.substring(currentStringPos);
            if ((timezone.charAt(0) == 'Z' || timezone.charAt(0) == 'z') && timezone.length() == 1) {
            } else if (timezone.length() == NUMERIC_TIME_ZONE_LENGTH
                    && (timezone.charAt(0) == '+' || timezone.charAt(0) == '-')
                    && timezone.charAt(3) == ':') {
                int hours = Integer.parseInt(timezone.substring(1, 3));
                int minutes = Integer.parseInt(timezone.substring(4, 6));
                timeZoneOffset = ((hours * 60) + minutes) * 60000;
                if (timezone.charAt(0) == '+') {
                    timeZoneOffset = -timeZoneOffset;
            } else {
                throw new NumberFormatException();
    } catch (IndexOutOfBoundsException e) {
        throw new NumberFormatException();
return timeZoneOffset;
voidremoveTime(Calendar c)
remove Time 
if (c == null)
    return;
c.set(c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
c.set(Calendar.MILLISECOND, 0);
CalendarremoveTime(Calendar cal)
remove Time 
return new GregorianCalendar(cal.get(cal.YEAR), cal.get(cal.MONTH), cal.get(cal.DAY_OF_MONTH));
CalendarremoveTime(Calendar calendar)
remove Time 
Calendar returnCalendar = (Calendar) calendar.clone();
returnCalendar.set(Calendar.HOUR_OF_DAY, 0);
returnCalendar.set(Calendar.MINUTE, 0);
returnCalendar.set(Calendar.SECOND, 0);
returnCalendar.set(Calendar.MILLISECOND, 0);
return returnCalendar;
CalendarremoveTime(final Calendar date)
Remote the time elements of the passed Calendar , setting the time to midnight of that day. 
date.set(Calendar.SECOND, 0);
date.set(Calendar.MINUTE, 0);
date.set(Calendar.HOUR, 0);
date.set(Calendar.HOUR_OF_DAY, 0);
date.set(Calendar.MILLISECOND, 0);
date.getTimeInMillis();
return date;
CalendarresetTime(Calendar cal)
Resets the time part of the date to 0:0:0 
if (cal != null) {
    cal.set(Calendar.HOUR_OF_DAY, 0); 
    cal.set(Calendar.MINUTE, 0); 
    cal.set(Calendar.SECOND, 0); 
    cal.set(Calendar.MILLISECOND, 0); 
return cal;
voidresetTime(Calendar cal)
reset Time 
cal.set(11, 0);
cal.set(12, 0);
cal.set(13, 0);
cal.set(14, 0);