Google 应用程序脚本一直将我的计算视为字符串，如何解决？

Question

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I got a code like this:

  var date = new Date(new Date() + dateAdjust*3600*1000 );

However, the result came out weird. But if I change the plus sign to a minus sign, and make the dateAdjust become negative, it results right. I think it considers dateAdjust 3600 1000 as a string. How do I fix that? I heard some people say to use parseInt(), but it doesn't work either.

  var date = new Date(new Date() + parseInt(dateAdjust*3600*1000) );

Answer 1

Regarding the first code line, the part that is evaluated first is new Date() + dateAdjust . Here the problem is that when using + having a Date object to the left, makes the date object to be converted into a string.

Having a string to the left of + , makes the right operand to be converted into a string.

The fix might be to use use new Date().getTime() . This will return the date-time in milliseconds since January 1, 1970 00:00:00 UTC . Assuming that dateAjust has assigned a number, then the final code might be:

  var date = new Date(new Date().getTime() + dateAdjust * 3600 * 1000 );