当我创建一个新的Date对象时,它被初始化为当前时间,但在本地时区。如何获得当前的GMT日期和时间?


当前回答

当前UTC日期

Instant.now().toString().replaceAll("T.*", "");

其他回答

如果你想避免解析日期,只是想要一个GMT的时间戳,你可以使用:

final Date gmt = new Timestamp(System.currentTimeMillis()
            - Calendar.getInstance().getTimeZone()
                    .getOffset(System.currentTimeMillis()));
SimpleDateFormat dateFormatGmt = new SimpleDateFormat("yyyy-MMM-dd HH:mm:ss");
dateFormatGmt.setTimeZone(TimeZone.getTimeZone("GMT"));

//Local time zone   
SimpleDateFormat dateFormatLocal = new SimpleDateFormat("yyyy-MMM-dd HH:mm:ss");

//Time in GMT
return dateFormatLocal.parse( dateFormatGmt.format(new Date()) );

当前UTC日期

Instant.now().toString().replaceAll("T.*", "");
public static void main(String args[]){
    LocalDate date=LocalDate.now();  
    System.out.println("Current date = "+date);
}
    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());