Java Utililty Methods TimeZone String Parse

List of utility methods to do TimeZone String Parse

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TimeZone String Parse

Description

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

Method

TimeZone guessTimeZone(String timezoneOffset)
guess Time Zone

return offsetMap.get(timezoneOffset.trim());

Calendar parseCal(long time, TimeZone to)
parse Cal

Calendar calendar = Calendar.getInstance();
TimeZone fromTimeZone = calendar.getTimeZone();
TimeZone toTimeZone = to != null ? to : TimeZone.getTimeZone("GMT");
calendar.setTimeZone(fromTimeZone);
calendar.add(Calendar.MILLISECOND, fromTimeZone.getRawOffset() * -1);
if (fromTimeZone.inDaylightTime(calendar.getTime())) {
 calendar.add(Calendar.MILLISECOND, calendar.getTimeZone().getDSTSavings() * -1);
calendar.add(Calendar.MILLISECOND, toTimeZone.getRawOffset());
if (toTimeZone.inDaylightTime(calendar.getTime())) {
 calendar.add(Calendar.MILLISECOND, toTimeZone.getDSTSavings());
calendar.setTimeInMillis(time);
return calendar;

Date parseDA(TimeZone tz, String s)
parse DA

return parseDA(tz, s, false);

TimeZone parseTimeZoneId(String timeZoneId)
parse Time Zone Id

TimeZone zone = TimeZone.getDefault();
String zoneName = "";
if (null != timeZoneId && !"".equals(timeZoneId)) {
 timeZoneId = timeZoneId.trim().replaceAll("\\s+", "");
 int index2 = timeZoneId.indexOf(")");
 if (index2 >= 0) {
 zoneName = timeZoneId.substring(index2 + 1, timeZoneId.length()).trim();
 zone = TimeZone.getTimeZone(zoneName);
return zone;

TimeZone parseTimeZoneString(String timeZoneString)
Parse the given timeZoneString value into a TimeZone .

TimeZone timeZone = TimeZone.getTimeZone(timeZoneString);
if ("GMT".equals(timeZone.getID()) && !timeZoneString.startsWith("GMT")) {
 throw new IllegalArgumentException("Invalid time zone specification '" + timeZoneString + "'");
return timeZone;

TimeZone parseTimeZoneString(String timeZoneString)
parse Time Zone String

TimeZone timeZone = TimeZone.getTimeZone(timeZoneString);
if ("GMT".equals(timeZone.getID()) && !timeZoneString.startsWith("GMT")) {
 throw new IllegalArgumentException("Invalid time zone specification '" + timeZoneString + "'");
return timeZone;

TimeZone safeTimeZone(String s)
safe Time Zone

String tzid = tzid(s);
if (tzid == null)
 return null;
TimeZone tz = cachedTimeZone;
if (tz == null || !tz.getID().equals(tzid))
 cachedTimeZone = tz = TimeZone.getTimeZone(tzid);
return tz;