如何获得最小和最大日期 [英] How to get the minimum and maximum date

问题描述

如何获得最小和最大的日期。我看到最小的数字可以是这样的：

How do I get the smallest and biggest date. I see that the smallest number can be got like this:

Number.MIN_VALUE

日期没有这个。有没有办法找到最小和最大的日期

Date does not have this. Is there a way to find the smallest and biggest date

推荐答案

日期没有这个

Date does not have this

实际上，确实如此，但只是间接地。根据规范，日期 object的毫秒数 - 因为Epoch值只能在-8640000000000000到8640000000000000的范围内。

Actually, it does, but only indirectly. According to the specification, a Date object's milliseconds-since-the-Epoch value can only be in the range -8640000000000000 to 8640000000000000.

所以最小日期是新日期（-8640000000000000）（星期二，2月20日 - 271821 00:00:00 GMT），最长日期新日期（8640000000000000）（星期六，9月13日275760 00:00:00 GMT）。

So the minimum date is new Date(-8640000000000000) (Tue, 20 Apr -271821 00:00:00 GMT), and the maximum date is new Date(8640000000000000) (Sat, 13 Sep 275760 00:00:00 GMT).

如果你愿意，你可以把它们放在日期作为属性的函数：

If you wanted, you could put those on the Date function as properties:

Date.MIN_VALUE = new Date(-8640000000000000);
Date.MAX_VALUE = new Date(8640000000000000);

...但是因为日期实例是可变，我可能不会，因为它太容易意外修改其中一个。另一种方法是：

...but since Date instances are mutable, I probably wouldn't, because it's too easy to accidentally modify one of them. An alternative would be to do this:

Object.defineProperties(Date, {
    MIN_VALUE: {
      value: -8640000000000000 // A number, not a date
    },
    MAX_VALUE: {
      value: 8640000000000000
    }
});

它定义了日期中不能存在的属性已更改具有日期的最小/最大数值。 （在支持ES5的JavaScript引擎上。）

That defines properties on Date that cannot be changed that have the min/max numeric value for dates. (On a JavaScript engine that has ES5 support.)

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