javascript 如何有效地以YYYYDDMM格式在javascript中获取三个月前的日期
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How to get three month ago date in javascript in the format as YYYYDDMM efficiently
提问by javaMan
I know a way to do in java:
我知道一种用java做的方法：
Calendar c5 = Calendar.getInstance();
c5.add(Calendar.MONTH, -6);
c5.getTime(); //It will give YYYYMMDD format three months ago.
Is there a way to do this in javascript. I know that I can use Date d = new Date(); parse it and do some code to get the format. But now I dont want to do parsing and getting three month ago date.
有没有办法在javascript中做到这一点。我知道我可以使用 Date d = new Date(); 解析它并执行一些代码来获取格式。但现在我不想解析和获取三个月前的日期。
回答by sachleen
var dt = new Date('13 June 2013');
dt.setMonth(dt.getMonth()-1)
Then you can use this piece of code from this answerto convert it to YYYYMMDD
然后您可以使用此答案中的这段代码将其转换为 YYYYMMDD
Date.prototype.yyyymmdd = function() {
var yyyy = this.getFullYear().toString();
var mm = (this.getMonth()+1).toString(); // getMonth() is zero-based
var dd = this.getDate().toString();
return yyyy + (mm[1]?mm:"0"+mm[0]) + (dd[1]?dd:"0"+dd[0]); // padding
};
d = new Date();
d.yyyymmdd();
Something to be careful of. If you're at Mar 31 and subtract a month, what happens? You can't get Feb 31! See thisanswer for more details.
有什么要小心的。如果你在 3 月 31 日减去一个月，会发生什么？你不能得到 2 月 31 日！有关更多详细信息，请参阅此答案。
