Javascript MomentJS - 如何从日期获取上个月的最后一天?

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时间:2020-08-22 23:32:16  来源:igfitidea点击:

MomentJS - How to get last day of previous month from date?

javascriptdatemomentjs

提问by redrom

I'm trying to get last day of the previous month using:

我正在尝试使用以下方法获取上个月的最后一天:

 var dateFrom = moment(dateFrom).subtract(1, 'months').format('YYYY-MM-DD');

Where:

在哪里:

dateFrom = 2014-11-30 

But after using

但是使用后

subtract(1, 'months')

it returns date

它返回日期

DATE_FROM: "2014-10-30"

But last day of the 10'th month is 31.

但是第 10 个月的最后一天是 31。

How can I solve i please?

请问我该如何解决?

Many thanks for any help.

非常感谢您的帮助。

回答by MorKadosh

Simply add a endOf('month')to your calls:

只需endOf('month')在您的通话中添加一个:

var dateFrom = moment(dateFrom).subtract(1,'months').endOf('month').format('YYYY-MM-DD');

var dateFrom = moment(dateFrom).subtract(1,'months').endOf('month').format('YYYY-MM-DD');

http://jsfiddle.net/r42jg/327/

http://jsfiddle.net/r42jg/327/

回答by mhodges

An even easier solution would be to use moment.date(0). the .date()function takes the 1 to n day of the current month, however, passing a zero or negative number will yield a dates in the previous month.

一个更简单的解决方案是使用moment.date(0). 该.date()函数取当月的第 1 到 n 天,但是,传递零或负数将产生上个月的日期。

For example if current date is February 3rd:

例如,如果当前日期是 2 月 3 日:

var _date = moment(); // 2018-02-03 (current day)
var _date2 = moment().date(0) // 2018-01-31 (start of current month minus 1 day)
var _date3 = moment().date(4) // 2018-02-04 (4th day of current month)
var _date4 = moment().date(-4) // 2018-01-27 (start of current month minus 5 days)

console.log(_date.format("YYYY-MM-DD"));
console.log(_date2.format("YYYY-MM-DD"));
console.log(_date3.format("YYYY-MM-DD"));
console.log(_date4.format("YYYY-MM-DD"));
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.20.1/moment.js"></script>

回答by Jojo Joseph

Last month's First date and last month's last date from the current date basis. The Format of the date changes depending upon. (DD-MM-YYYY)

从当前日期开始的上个月的第一个日期和上个月的最后一个日期。日期的格式因人而异。(DD-MM-YYYY)

console.log("last month first date");
   const lastmonthlastdate=moment().subtract(1, 'months').startOf('month').format('DD-MM-YYYY')
console.log(lastmonthlastdate);

console.log("lastmonth last date");
   const lastmonthfirstdate=moment().subtract(1, 'months').endOf('month').format('DD-MM-YYYY')
console.log(lastmonthfirstdate);