javascript Date.parse 和 Date.UTC 给出不同的结果
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javascript Date.parse and Date.UTC give different results
提问by Yang
Can anyone explain to me why?
谁能向我解释为什么？
d = Date.parse('8/15/2012 '+'11:59:45 AM');
alert(d);
alert(Date.UTC(2012, 7, 15, 11, 59, 45));
?
?
回答by Corbin
Date.parse assumes local time if not specified.
如果未指定，则 Date.parse 假定为本地时间。
The UTC one, however, is obviously UTC.
然而，UTC 显然是 UTC。
For example, my computer is UTC -5 (well, Chicago CDT actually), so the two timestamps happen to be 5 hours apart for me.
例如，我的计算机是 UTC -5（嗯，实际上是芝加哥 CDT），所以两个时间戳对我来说恰好相隔 5 小时。
You will get the same thing if you specify UTC:
如果您指定 UTC，您将得到同样的结果：
Date.parse('8/15/2012 '+'11:59:45 AM UTC'); //1345031985000
Date.UTC(2012, 7, 15, 11, 59, 45); //1345031985000
回答by Euric
I'll assume the difference in months was a typo in your question.
我假设几个月的差异是您问题中的错字。
Date.parse returns the difference between the date provided and midnight 1 January 1970.
Date.parse 返回提供的日期与 1970 年 1 月 1 日午夜之间的差值。
Date.UTC returns the difference between your date and midnight 1 January 1970 GMT.
Date.UTC 返回您的日期与格林威治标准时间1970 年 1 月 1 日午夜之间的差值。
If your timezone is set to GMT (UTC) you should expect to see the same value returned by both calls.
如果您的时区设置为 GMT (UTC)，您应该会看到两个调用返回的相同值。
