向 JavaScript Date 对象添加小时数? [英] Adding hours to JavaScript Date object?

问题描述

令我惊讶的是 JavaScript 的 Date 对象没有实现任何类型的添加功能.

It amazes me that JavaScript's Date object does not implement an add function of any kind.

我只是想要一个可以做到这一点的函数:

I simply want a function that can do this:

var now = Date.now();
var fourHoursLater = now.addHours(4);

function Date.prototype.addHours(h) {

   // how do I implement this?  

}

我只是想要一些指向某个方向的指针.

I would simply like some pointers in a direction.

• 我需要做字符串解析吗?

• Do I need to do string parsing?

我可以使用 setTime 吗?

Can I use setTime?

毫秒呢?

像这样:

new Date(milliseconds + 4*3600*1000 /*4 hrs in ms*/)?  

虽然这看起来很hackish - 它甚至有效吗?

This seems really hackish though - and does it even work?

推荐答案

JavaScript 本身有糟糕的日期/时间 API.尽管如此，您可以在纯 JavaScript 中执行此操作:

JavaScript itself has terrible Date/Time API's. Nonetheless, you can do this in pure JavaScript:

Date.prototype.addHours = function(h) {
  this.setTime(this.getTime() + (h*60*60*1000));
  return this;
}

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