Java convert data/time between timezone is inaccurate
TimeZone.setDefault(TimeZone.getTimeZone("Europe/Moscow"));
System.out.println("Default Timezone: " + TimeZone.getDefault());
String date = "08/04/2016 00:00:00";
SimpleDateFormat simpleDateFormatMoscow = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
Date moscowDt = simpleDateFormatMoscow.parse(date);
System.out.println("Moscow Date: " + simpleDateFormatMoscow.format(moscowDt));
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
simpleDateFormat.setTimeZone(TimeZone.getTimeZone("Asia/Bangkok"));
System.out.println("Bangkok Date: " + simpleDateFormat.format(moscowDt));
Calendar calendar = new GregorianCalendar();
calendar.setTime(moscowDt);
calendar.setTimeZone(TimeZone.getTimeZone("Asia/Bangkok"));
System.out.println("Bangkok Date: " + simpleDateFormat.format(calendar.getTime()));
System.out.println("Test Timezone");
System.out.println(TimeZone.getTimeZone("America/New_York"));
System.out.println(TimeZone.getTimeZone("Europe/Moscow"));
System.out.println(TimeZone.getTimeZone("Asia/Bangkok"));
I tried to use the code this snippet to convert date/time between Moscow and Bangkok. The result is as followed:
Default Timezone:
sun.util.calendar.ZoneInfo[id="Europe/Moscow",offset=14400000,dstSavings=0,useDaylight=false,transitions=78,lastRule=null]
Moscow Date: 08/04/2016 00:00:00
//util date/time
Bangkok Date: 08/04/2016 03:00:00
//joda time
Bangkok Date: 08/04/2016 03:00:00
However, when I convert date/time using https://singztechmusings.wordpress.com/2011/06/23/java-timezone-correctionconversion-with-daylight-savings-time-settings/ or google the time is
Moscow Date: 08/04/2016 00:00:00
Bangkok Date: 08/04/2016 04:00:00
Could anyone please tell me the correct way to convert data/time using java? And Could anyone please tell me what I did wrong and why the result is inaccurate?
Your Java have wrong timezone offset: "offset=14400000" is 4 hours, but Moscow is UTC+3 for last year and a half.
Upgrade your java with tzupdater.
Java is using its own timezone data which is independenct from the host operation system. It might be inaccurate if you are not using the latest version of Java cause Russia (Europe/Moscow) has switched from daylight saving time to permanent standard time two years ago
这是首先使用当地时区进行操作的一种方法。
public static void main(String[] args) {
// Create a calendar object and set it time based on the local time zone
Calendar localTime = Calendar.getInstance();
localTime.set(Calendar.HOUR, 17);
localTime.set(Calendar.MINUTE, 15);
localTime.set(Calendar.SECOND, 20);
int hour = localTime.get(Calendar.HOUR);
int minute = localTime.get(Calendar.MINUTE);
int second = localTime.get(Calendar.SECOND);
// Print the local time
System.out.printf("Local time : %02d:%02d:%02dn", hour, minute, second);
// Create a calendar object for representing a Bangkok time zone. Then we set
//the time of the calendar with the value of the local time
Calendar BangkokTime = new GregorianCalendar(TimeZone.getTimeZone("Asia/Bangkok"));
BangkokTime.setTimeInMillis(localTime.getTimeInMillis());
hour = BangkokTime.get(Calendar.HOUR);
minute = BangkokTime.get(Calendar.MINUTE);
second = BangkokTime.get(Calendar.SECOND);
// Print the local time in Bangkok time zone
System.out.printf("Bangkok time: %02d:%02d:%02dn", hour, minute, second);
//Then do the same for the Moscow time zone
Calendar MoscowTime = new GregorianCalendar(TimeZone.getTimeZone("Europe/Moscow"));
MoscowTime.setTimeInMillis(localTime.getTimeInMillis());
hour = MoscowTime.get(Calendar.HOUR);
minute = MoscowTime.get(Calendar.MINUTE);
second = MoscowTime.get(Calendar.SECOND);
// Print the local time in Moscow time zone
System.out.printf("Moscow time: %02d:%02d:%02dn", hour, minute, second);
}
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