Java Utililty Methods TimeZone Usage

List of utility methods to do TimeZone Usage

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Description

The list of methods to do TimeZone Usage are organized into topic(s).

Method

longaddGmtOffset(long millis)
add Gmt Offset 
return millis + localTimeZone.getOffset(millis);
voidassertTimeZoneNotNull(String methodName, TimeZone timeZone)
assert Time Zone Not Null 
if (timeZone == null) {
    String msg = "The argument 'timeZone' should not be null: method=" + methodName;
    throw new IllegalArgumentException(msg);
TimeZonebuildTimezone(int hours, int minutes)
Builds a timezone object with the given offset. 
int hourMillis = 1000 * 60 * 60 * hours;
int minuteMillis = 1000 * 60 * minutes;
if (hours < 0) {
    minuteMillis *= -1;
return new SimpleTimeZone(hourMillis + minuteMillis, "");
intcomputeTimeZoneOffsetInHours(TimeZone timeZone, long currentDatetime)
Computes the offset in hours for a given timezone at a given date/time. 
int offsetInMilliseconds = timeZone.getOffset(currentDatetime);
return offsetInMilliseconds / (1000 * 60 * 60);
StringcreatePostgresTimeZone()
Convert Java time zone to postgres time zone. 
String tz = TimeZone.getDefault().getID();
if (tz.length() <= 3 || !tz.startsWith("GMT")) {
    return tz;
char sign = tz.charAt(3);
String start;
if (sign == '+') {
    start = "GMT-";
...
TimeZonecreateTaiTimeZone(int leapSecs)
create Tai Time Zone 
return new SimpleTimeZone(leapSecs * 1000, "TAI");
DatedatePlusDays(Date date, int days)
date Plus Days 
Calendar calendar = getMoscowCalendar();
calendar.setTime(date);
calendar.add(Calendar.DAY_OF_YEAR, days);
return calendar.getTime();
TimeZonefindTimeZoneInDate(String date)
find Time Zone In Date 
StringBuilder sb = new StringBuilder();
StringBuilder dateBuilder = new StringBuilder(date.trim()).reverse();
int index = 0;
char c;
while ((c = dateBuilder.charAt(index++)) != ' ') {
    sb.append(c);
TimeZone timezone = TimeZone.getTimeZone(sb.reverse().toString());
...
booleanisInEasternEightZones()
is In Eastern Eight Zones 
boolean defaultVaule = true;
if (TimeZone.getDefault() == TimeZone.getTimeZone("GMT+08"))
    defaultVaule = true;
else
    defaultVaule = false;
return defaultVaule;
booleanisKeepTimeZone(TimeZone tz)
is Keep Time Zone 
if (tz.getID().startsWith("Africa")) { 
    return true;
} else if (tz.getID().startsWith("America")) { 
    return true;
} else if (tz.getID().startsWith("Antarctica")) { 
    return true;
} else if (tz.getID().startsWith("Asia")) { 
    return true;
...