如何进行弹性日期扣除和加法 [英] How to do Flex date deduction and addition

问题描述

在 flex 中，我正在尝试进行日期推导和加法，但找不到方法.

In flex, I am trying to do date deduction and addition, but couldn't find a way to do it.

例如:public var dateNow:Date=new Date();

e.g.: public var dateNow:Date=new Date();

如何获得比 dateNow 早 3 个月的日期?

How can I get the Date 3 months earlier than dateNow?

谢谢！！！

推荐答案

您可以为此使用 Date 构造函数.Date 构造函数的第一个参数需要年份或时间戳.您可以使用 Date.time 属性从日期对象中获取时间戳.获得时间戳后，您可以从中添加/减去一些秒数，然后将其传递给 new Date(timestamp)，您将获得一个代表新时间戳的全新日期.

You can use the Date constructor for this. The first argument to Date's constructor takes either a year or a timestamp. You can use the Date.time property to get the timestamp from a date object. Once you have the timestamp you can add/subtract some number of seconds from it, and then pass it to new Date(timestamp) and you get a brand new date which represents the new timestamp.

编辑；正如评论者指出的那样，时间操纵可能不是最好的方法.但是您仍然可以使用 Date 构造函数，如下所示:

Edit; As a commenter pointed out, time manipulation may not be the best way to go. But you can still use the Date constructor as follows:

var now:Date = new Date();
var threeMonthsAgo = new Date(now.fullYear, 
                              now.month - 3,  
                              now.date, 
                              now.hour, 
                              now.minute, 
                              now.second, 
                              now.millisecond);

Date 构造函数足够智能，可以处理负值或大于 11 的值.

The Date constructor is smart enough to deal with negative values, or values greater than 11.

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