java - Java中的时区

我正在使用Java中的安全签名进行工作，该签名还可以验证进行调用的日期和时间。 POST呼叫到达时类似

String date = "Sat, 27 Apr 2013 01:11:30 GMT"
SimpleDateFormat RFC1123Format = new SimpleDateFormat("EEE, dd MMM yyyyy HH:mm:ss z", Locale.US);

我能够解析它

Calendar gmtTime = new GregorianCalendar(TimeZone.getTimeZone("GMT"));
Date dateHeader = RFC1123Format.parse(date);
gmtTime.setTime(dateHeader);

System.out.println("Date Header (GMT TIME): " + gmtTime.getTimeInMillis() + " ms");
System.out.println("Hour of day (GMT TIME): " + gmtTime.get(Calendar.HOUR_OF_DAY));

Calendar currentTime = new GregorianCalendar(TimeZone.getTimeZone("GMT"));
currentTime.setTimeInMillis(System.currentTimeMillis());

System.out.println("System Date (LA TIME): " + currentTime.getTimeInMillis() + " ms");
System.out.println("Hour of day (LA TIME): " + currentTime.get(Calendar.HOUR_OF_DAY));

currentTime.setTimeZone(TimeZone.getTimeZone("GMT"));

System.out.println("System Date (GMT TIME): " + currentTime.getTimeInMillis() + " ms");
System.out.println("Hour of day (GMT TIME): " + currentTime.get(Calendar.HOUR_OF_DAY));

System.out.println("Diff: " + Math.abs(gmtTime.getTimeInMillis() - currentTime.getTimeInMillis()));

但是，我得到的打印输出在整个1小时内都不相同。

Date Header (GMT TIME): 1367025090000 ms
Hour of day (GMT TIME): 1
System Date (LA TIME): 1367022298441 ms
Hour of day (LA TIME): 0
System Date (GMT TIME): 1367022298441 ms
Hour of day (GMT TIME): 0
Diff: 2791559

有任何想法吗？

最佳答案

您可以使用JodaTime >> http://joda-time.sourceforge.net/，它比Java日历更有效地实现TimeZone计算