这是我的实现:

public static String GetCurrentTimeStamp()
{
    Calendar cal=Calendar.getInstance();
    long offset = cal.getTimeZone().getOffset(System.currentTimeMillis());//if you want in UTC else remove it .
    return new java.sql.Timestamp(System.currentTimeMillis()+offset).toString();    
}

如果你正在使用joda time，并希望当前时间以毫秒为单位，不需要本地偏移量，你可以使用这个:

long instant = DateTimeZone.UTC.getMillisKeepLocal(DateTimeZone.getDefault(), System.currentTimeMillis());

你可以使用的简单函数:

编辑:这个版本使用现代java。时间类。

private static final DateTimeFormatter FORMATTER
        = DateTimeFormatter.ofPattern("dd-MM-uuuu HH:mm:ss z");

public static String getUtcDateTime() {
    return ZonedDateTime.now(ZoneId.of("Etc/UTC")).format(FORMATTER);
}

方法返回值:

26-03-2022 17:38:55 UTC

最初的功能:

 public String getUTC_DateTime() {
    SimpleDateFormat dateTimeFormat = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss z");
    dateTimeFormat.setTimeZone(TimeZone.getTimeZone("UTC"));//gmt
    return dateTimeFormat.format(new Date());

}

以上函数返回:

26-03-2022 08:07:21 UTC 

日历aGMTCalendar = Calendar. getinstance (TimeZone.getTimeZone("GMT")); 然后，使用aGMTCalendar对象执行的所有操作都将使用GMT时区完成，并且不会应用夏令时或固定偏移量

错了!

Calendar aGMTCalendar = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
aGMTCalendar.getTime(); //or getTimeInMillis()

and

Calendar aNotGMTCalendar = Calendar.getInstance(TimeZone.getTimeZone("GMT-2"));aNotGMTCalendar.getTime();

会在同一时间回来。同上的对

new Date(); //it's not GMT.

这里还有一个获取GMT时间戳对象的建议:

import java.sql.Timestamp;
import java.util.Calendar;

...

private static Timestamp getGMT() {
   Calendar cal = Calendar.getInstance();
   return new Timestamp(cal.getTimeInMillis()
                       -cal.get(Calendar.ZONE_OFFSET)
                       -cal.get(Calendar.DST_OFFSET));
}

    Calendar c = Calendar.getInstance();
    System.out.println("current: "+c.getTime());

    TimeZone z = c.getTimeZone();
    int offset = z.getRawOffset();
    if(z.inDaylightTime(new Date())){
        offset = offset + z.getDSTSavings();
    }
    int offsetHrs = offset / 1000 / 60 / 60;
    int offsetMins = offset / 1000 / 60 % 60;

    System.out.println("offset: " + offsetHrs);
    System.out.println("offset: " + offsetMins);

    c.add(Calendar.HOUR_OF_DAY, (-offsetHrs));
    c.add(Calendar.MINUTE, (-offsetMins));

    System.out.println("GMT Time: "+c.getTime());