jQuery 如何获得两个日期对象之间的小时差？
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How to get the hours difference between two date objects?
提问by Anoniem Anoniem
I got two Date objects and I want to calculate the difference in hours.
我有两个 Date 对象，我想以小时为单位计算差异。
If the difference in hours is less than 18 hours, I want to push the date object into an array.
如果小时差小于 18 小时，我想将日期对象推送到数组中。
Javascript / jQuery, doesn't really matter; what works the best will do.
Javascript / jQuery，并不重要；什么效果最好。
回答by Boaz - Reinstate Monica
The simplest way would be to directly subtract the date objects from one another.
最简单的方法是直接从彼此减去日期对象。
For example:
例如：
var hours = Math.abs(date1 - date2) / 36e5;
The subtraction returns the difference between the two dates in milliseconds. 36e5is the scientific notation for 60*60*1000, dividing by which converts the milliseconds difference into hours.
减法以毫秒为单位返回两个日期之间的差值。36e5是 的科学记数法60*60*1000，除以将毫秒差转换为小时。
回答by leaf
Try using getTime(mdn doc) :
尝试使用getTime（mdn doc）：
var diff = Math.abs(date1.getTime() - date2.getTime()) / 3600000;
if (diff < 18) { /* do something */ }
Using Math.abs()we don't know which date is the smallest. This code is probably more relevant :
使用Math.abs()我们不知道哪个日期是最小的。此代码可能更相关：
var diff = (date1 - date2) / 3600000;
if (diff < 18) { array.push(date1); }
回答by Matt Zeunert
Use the timestamp you get by calling valueOfon the date object:
使用通过调用valueOf日期对象获得的时间戳：
var diff = date2.valueOf() - date1.valueOf();
var diffInHours = diff/1000/60/60; // Convert milliseconds to hours
