日期差异包括时区偏移，有什么问题吗？
我有这样的代码：
Date now = new Date();
// the string is in UTC format, so a UTC date must be constructed, I don't know if that happens in this format
Date measure = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(utcDateTime);
long diff = now.getTime() - measure.getTime();
if (diff < 1000* 60 * 15) {
// measure is less then 15 minutes recent
do some work
}
当我得到差异时，它包括时区。我知道 Date 对象内部是 UTC。
那么这里出了什么问题呢？
I have this code:
Date now = new Date();
// the string is in UTC format, so a UTC date must be constructed, I don't know if that happens in this format
Date measure = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(utcDateTime);
long diff = now.getTime() - measure.getTime();
if (diff < 1000* 60 * 15) {
// measure is less then 15 minutes recent
do some work
}
When I get the diff, it includes the timezone. I know the Date object internally is UTC.
So what's wrong here?
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虽然
Date对象确实采用 UTC，但您的SimpleDateFormat可能不是。我怀疑它默认是系统时区 - 这肯定是实验所建议的。您可以使用DateFormat.setTimeZone更改此设置。因此，如果您的文本表示 UTC 日期/时间，您也应该将格式化程序的时区设置为 UTC。或者您可以使用 Joda Time，这是一个通常更好的日期和时间 API :)
While a
Dateobject is indeed in UTC, yourSimpleDateFormatmay not be. I suspect it default's to the system time zone - that's certainly what experimentation would suggest. You can change this usingDateFormat.setTimeZone. So if your text represents a UTC date/time, you should set the time zone of the formatter to UTC as well.Or you could use Joda Time, which is a generally better date and time API :)