Java Utililty Methods ZonedDateTime Calculate

List of utility methods to do ZonedDateTime Calculate

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Description

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

Method

ZonedDateTimeaddOffset(ZonedDateTime time, String offset)
Applies an ISO 8601 Duration to a ZonedDateTime . 
final int tPos = offset.indexOf('T');
final String periodOffset;
final String durationOffset;
switch (tPos) {
case -1:
    periodOffset = offset;
    break;
case 1:
...
ZonedDateTimeaddRandomDeltaDays(ZonedDateTime ZDT, int minDays, int maxDays, int minHour, int maxHour)
Adds/substract randomly between minDays and maxDays number of days to this date and sets the hours within the range prescribed (min/maxHours), and a randomly selected minute between 0 and 60. 
if (ZDT == null)
    return null;
int days = (int) Math.floor((Math.random() * (maxDays - minDays)) + minDays);
int hours = (int) Math.floor((Math.random() * (maxHour - minHour)) + minHour);
int minutes = (int) Math.floor((Math.random() * 60));
return ZDT.plusDays(days).withHour(hours).withMinute(minutes);
ZonedDateTimeaddRandomDeltaMinutes(ZonedDateTime ZDT, int minMinutes, int maxMinutes)
Adds/substract randomly between min/maxMinutes number of minutes to this date. 
if (ZDT == null)
    return null;
int minutes = (int) Math.round((Math.random() * (minMinutes - minMinutes)) + minMinutes);
return ZDT.plusMinutes(minutes);
ZonedDateTimeasZonedDateTime(Date date)
Calls #asZonedDateTime(Date,ZoneId) with the system default time zone. 
return asZonedDateTime(date, ZoneId.systemDefault());
ZonedDateTimecalculateTimeForSunrise(ZonedDateTime from, ZonedDateTime to)
calculate Time For Sunrise 
Duration d = Duration.between(from, to);
long distance = d.getSeconds() / 60 / 60 / 2;
return from.plusHours(distance);
StringcanonicalTimeString(ZonedDateTime time)
ISO8601 can map the same date and time to many different string representations. 
ZonedDateTime asUTC = time.withZoneSameInstant(ZoneOffset.UTC);
return asUTC.format(canonicalFormatter);
ZonedDateTimecloneZonedDateTime(ZonedDateTime zonedDateTime)
clone Zoned Date Time 
if (zonedDateTime == null) {
    return null;
return zonedDateTime.withZoneSameInstant(METZONE);
intcomputeDays(ZonedDateTime Start, ZonedDateTime End)
Comput ethe number of days using th emidnight rule, i.e., from 23:59 Monday night to 00:01 Tuesday morning, that counts as one day. 
int days = (int) ChronoUnit.DAYS.between(Start, End);
if (secondsSinceMidnight(Start) > secondsSinceMidnight(End))
    ++days;
return days;
ZonedDateTimeconvertDateToZonedDateTime(Date date, String timezone)
convert Date To Zoned Date Time 
if (timezone == null || timezone.equals("")) {
    return date.toInstant().atZone(ZoneId.systemDefault());
return date.toInstant().atZone(ZoneId.of(timezone));
DateconvertForPersistence(@Nullable ZonedDateTime dt)
Convert the given ZonedDateTime to a UTC date for persistence 
if (dt == null)
    return null;
ZonedDateTime atUtc = dt.withZoneSameInstant(ZoneOffset.UTC);
return new Date(atUtc.toInstant().toEpochMilli());