使用moment.js将日期设置为第一天

Question

I am looking through the moment documentation and can't find the the method required. In my solution I am getting today's date then getting the month before and the month after, but wish to get the very first day of the month and the very last day of the month ahead.

In brief this should be the out come:

• today's date: 21/05/2017
• startDate = 01/04/2017
• endDate = 30/06/2017

My code:

var startDate = moment(date).subtract(1,'months')
var endDate = moment(date).add(1,'months');

Answer 1

Simply use add and subtract method to get next and previous month and startOf and endOf to get the first and the last day of the month.

Here a working sample:

 var date = moment([2017, 4, 21]); // one way to get 21/05/2017 // If your input is a string you can do: //var date = moment('21/05/2017', 'DD/MM/YYYY'); var startDate = date.clone().subtract(1, 'month').startOf('month'); var endDate = date.clone().add(1, 'month').endOf('month'); console.log(startDate.format('DD/MM/YYYY')); // 01/04/2017 console.log(endDate.format('DD/MM/YYYY')); // 30/06/2017 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script> 

Answer 2

您可以使用moment().startOf('month')和moment().endOf('month')方法

Answer 3

let startDate = moment().startOf('month').subtract(1, 'months').toDate()
let endDate = moment().endOf('month').add(1, 'months').toDate()