使用 moment.js 获取日期当前季度的最后一天

Question

I have a javascript date such as 05-04-2020.

I am trying to figure out how to get the current quarter of that date and then the last day of that quarter. The answer in this case should be 06-30-2020.

Below is a function that I created, but have a feeling it isn't the best way to do it:

function getLastDayOfQuarterMonth(date) {
    let retVal
    const quarter = moment(date).quarter()
    switch(quarter) {
      case 1:
        retVal = new Date(moment(date).year(), 2, 31)
        break;
      case 2:
        retVal = new Date(moment(date).year(), 5, 30)
        break;
      case 3:
        retVal = new Date(moment(date).year(), 8, 30)
        break;
      case 4:
        retVal = new Date(moment(date).year(), 11, 31)
        break;
    }

    return retVal
}

Answer 1

We can make use of quarter and endOf methods provided by moments .

 const date = "05-04-2020"; const getLastDayOfTheQuarter = (date) => moment().quarter(moment(date, "MM-DD-YYYY").quarter()).endOf('quarter').format("MM-DD-YYYY"); console.log(getLastDayOfTheQuarter(date)); console.log(getLastDayOfTheQuarter(moment().format("MM-DD-YYYY")));

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js"></script>

For simplicity, I have considered the input and output format as MM-DD-YYYY . It can be updated as per the need.

Answer 2

You can simple use endOf("quarter") :

 function getLastDayOfQuarterMonth(date) { return moment(date, "MM-DD-YYYY").endOf('quarter').toDate(); } console.log(getLastDayOfQuarterMonth("05-04-2020"));

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.25.0/moment.min.js"></script>

Please note that you have to specify format to correctly parse 05-04-2020 in moment, see moment(String, String) . You can use toDate() to get a copy of the native Date object that Moment.js wraps or format() to get the output you prefer.

Answer 3

You can use endOf function for that.

Example :

function getLastDayOfQuarterMonth(date) {
    let retVal = moment().quarter(moment(date).quarter()).endOf('quarter').format('MM-DD-YYYY');
    return retVal
}
let date = "05-04-2020";
alert(getLastDayOfQuarterMonth(date));

JSFiddle Link

Main Source