返回的时间和日期是正确的,但小时除外,它比应有的时间少 1 小时。
我似乎正在设置获得正确时间和日期所需的一切:
- I'm using Calendar.getInstance(), instead of new Date()
- I'm setting the timezone of the Calendar instance with Timezone.getTimeZone
- I'm using DateFormat and SimpleDateFormat to format the output
我的时区是Eastern Standard Time
aka UTC/GMT-5:00
。这些行都没有任何效果:
- cal.setTimeZone(TimeZone.getTimeZone(cal.getTimeZone().getDisplayName()));
- cal.setTimeZone(TimeZone.getTimeZone("EST"));
- cal.setTimeZone(TimeZone.getTimeZone("UTC"));
- cal.setTimeZone(TimeZone.getTimeZone("GMT"));
- cal.setTimeZone(TimeZone.getTimeZone("GMT-5:00"));
...但是这些选项中的每一个都设置了我想要的时区。
这是我的尝试,我错误地向
Calendar
实例添加了 1 小时:
PrintWriter output = null;
try {
output = new PrintWriter(
new BufferedWriter(new FileWriter("output.txt", true)));
DateFormat dateFormat = new SimpleDateFormat("HH:mm:ss:ms MM/dd/yyyy");
Calendar cal = Calendar.getInstance();
// ...doesn't seem to be working:
cal.setTimeZone(TimeZone.getTimeZone(cal.getTimeZone().getDisplayName()));
/*
* adding an extra hour here, to make up for the incorrect hour value???
* ...without this line, everything is correct except the hour = n - 1:
*/
//cal.setTimeInMillis(cal.getTimeInMillis() + (1000 * 60 * 60));
// printing to console here:
System.out.println(dateFormat.format(cal.getTime()));
System.out.println(cal.getTimeZone().getDisplayName());
// printing to the log-file here:
output.println(dateFormat.format(cal.getTime()));
output.println(cal.getTimeZone().getDisplayName());
} catch (IOException e) {
e.printStackTrace();
} finally {
if (output != null) {
output.close();
}
}
输出:
10:05:43:543 10/10/2013
GMT-05:00
错误——它应该是11:05:43:543
!( ps - 不幸的是我不能使用Joda-Time)