Finding the start and end dates of a specific month using Moment JS

Question

Finding the start and end dates of a specific month using Moment JS

I am facing an issue with calculating a JS date for the year 2014 and month 9 (September 2014).

My attempted solution was:

var moment = require('moment');
var startDate = moment(year + '-' + month + '-01' + ' 00:00:00');
            var endDate = startDate.endOf('month');
            console.log(startDate.toDate());
            console.log(endDate.toDate());

However, both logs are displaying:

Tue Sep 30 2014 23:59:59 GMT+0200 (CEST)
Tue Sep 30 2014 23:59:59 GMT+0200 (CEST)

The end date is correct but I am puzzled as to why the start date is not accurate.

javascript momentjs

Answer 1

Answer №1

One reason for this behavior is that the endOf function in Moment.js modifies the original value.

Explaining further:

The original moment object is changed to represent the end of a specified unit of time.

Below is a sample function that can help you achieve the desired result:

function getMonthDateRange(year, month) {
    var moment = require('moment');

    // as months are zero-based in moment.js (i.e., January is 0), subtracting one from user input
    var startDate = moment([year, month - 1]);

    // Creating a clone of the start date before using .endOf() method 
    var endDate = moment(startDate).endOf('month');

    // Outputting the dates for demonstration purposes:
    console.log(startDate.toDate());
    console.log(endDate.toDate());

    // Remember to convert to plain JavaScript Date type by calling toDate()
    return { start: startDate, end: endDate };
}

Additional Resources:

Answer 2

One reason for this behavior is that the endOf function in Moment.js modifies the original value.

Explaining further:

The original moment object is changed to represent the end of a specified unit of time.

Below is a sample function that can help you achieve the desired result:

function getMonthDateRange(year, month) {
    var moment = require('moment');

    // as months are zero-based in moment.js (i.e., January is 0), subtracting one from user input
    var startDate = moment([year, month - 1]);

    // Creating a clone of the start date before using .endOf() method 
    var endDate = moment(startDate).endOf('month');

    // Outputting the dates for demonstration purposes:
    console.log(startDate.toDate());
    console.log(endDate.toDate());

    // Remember to convert to plain JavaScript Date type by calling toDate()
    return { start: startDate, end: endDate };
}

Additional Resources:

Answer 3

Answer №2

Here is a simple way to get the start or end date of the month:

const startDate = moment().startOf('month').format("YYYY-DD-MM");
const endDate = moment().endOf("month").format("YYYY-DD-MM");

If you want to customize the format, just define it in the code.

Answer 4

Here is a simple way to get the start or end date of the month:

const startDate = moment().startOf('month').format("YYYY-DD-MM");
const endDate = moment().endOf("month").format("YYYY-DD-MM");

If you want to customize the format, just define it in the code.

Answer 5

Answer №3

By utilizing the .endOf() method, you are actually modifying the object it is applied to, causing the startDate variable to change to Sep 30.

To prevent this from happening, it is recommended to use the .clone() method to create a duplicate instead of altering the original object.

var startDate = moment(year + '-' + month + '-' + 01 + ' 00:00:00');
            var endDate = startDate.clone().endOf('month');
            console.log(startDate.toDate());
            console.log(endDate.toDate());

Mon Sep 01 2014 00:00:00 GMT+0700 (ICT) 
Tue Sep 30 2014 23:59:59 GMT+0700 (ICT)

Answer 6

By utilizing the .endOf() method, you are actually modifying the object it is applied to, causing the startDate variable to change to Sep 30.

To prevent this from happening, it is recommended to use the .clone() method to create a duplicate instead of altering the original object.

var startDate = moment(year + '-' + month + '-' + 01 + ' 00:00:00');
            var endDate = startDate.clone().endOf('month');
            console.log(startDate.toDate());
            console.log(endDate.toDate());

Mon Sep 01 2014 00:00:00 GMT+0700 (ICT) 
Tue Sep 30 2014 23:59:59 GMT+0700 (ICT)

Answer 7

Answer №4

Check out this code snippet:

const time=require('time');
console.log("start=>",time().startOf('day').format("YYYY-DD-MM"));
console.log("end=>",time().endOf('day').format("YYYY-DD-MM"));

Answer 8

Check out this code snippet:

const time=require('time');
console.log("start=>",time().startOf('day').format("YYYY-DD-MM"));
console.log("end=>",time().endOf('day').format("YYYY-DD-MM"));

Answer 9

Answer №5

While there may not be a direct method to obtain the last day of the month, you can achieve this by following these steps:

let currentDate = new Date();
/**
 * By adding 1 month to the current date and then subtracting 1 day,
 * we can find the last day of the present month.
 */
currentDate.setMonth(currentDate.getMonth() + 1);
currentDate.setDate(0);
/* Displaying the date of the last day of the month */
console.log(currentDate.toLocaleDateString());

Answer 10

While there may not be a direct method to obtain the last day of the month, you can achieve this by following these steps:

let currentDate = new Date();
/**
 * By adding 1 month to the current date and then subtracting 1 day,
 * we can find the last day of the present month.
 */
currentDate.setMonth(currentDate.getMonth() + 1);
currentDate.setDate(0);
/* Displaying the date of the last day of the month */
console.log(currentDate.toLocaleDateString());

Answer 11

Answer №6

To determine the end date based on a given start date that is set as the first day of the month, you can use the following code:

let endDate = moment(startDate).add(1, 'months').subtract(1, 'days');

I trust this information proves beneficial to you!

Answer 12

To determine the end date based on a given start date that is set as the first day of the month, you can use the following code:

let endDate = moment(startDate).add(1, 'months').subtract(1, 'days');

I trust this information proves beneficial to you!

Answer 13

Answer №7

let currentDate = new moment();
let beginningOfMonth = currentDate.clone().startOf('month');
let endOfMonth = currentDate.clone().endOf('month');
console.log(beginningOfMonth, endOfMonth);

documentation

Answer 14

let currentDate = new moment();
let beginningOfMonth = currentDate.clone().startOf('month');
let endOfMonth = currentDate.clone().endOf('month');
console.log(beginningOfMonth, endOfMonth);

documentation

Answer 15

Answer №8

let year = 2014;
let month = 9;

// adjusting for zero-based indexing in momentjs
let startDate = moment([year, month - 1, 01]).format("YYYY-MM-DD");

// calculating the number of days in the selected month
let daysInMonth = moment(startDate).daysInMonth();

// determining the end date by adding days to the start date
let endDate = moment(startDate).add(daysInMonth - 1, 'days').format("YYYY-MM-DD");

console.log(`start date: ${startDate}`);
console.log(`end date:   ${endDate}`);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.20.1/moment.min.js"></script>

Answer 16

let year = 2014;
let month = 9;

// adjusting for zero-based indexing in momentjs
let startDate = moment([year, month - 1, 01]).format("YYYY-MM-DD");

// calculating the number of days in the selected month
let daysInMonth = moment(startDate).daysInMonth();

// determining the end date by adding days to the start date
let endDate = moment(startDate).add(daysInMonth - 1, 'days').format("YYYY-MM-DD");

console.log(`start date: ${startDate}`);
console.log(`end date:   ${endDate}`);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.20.1/moment.min.js"></script>

Answer 17

Answer №9

const dateList = retrieveDatesInRange("2014-05-02", "2018-05-12", "YYYY/MM/DD", 1);           
console.log(dateList);
// receive complete date ranges based on input
var startDatesOnly = dateList.map(dateObject => dateObject["to"]);
console.log(startDatesOnly);
// additionally, if you only need starting dates then use the "map" function

function retrieveDatesInRange( startDate, endDate, format, increment ) {
    startDate = moment(startDate, format);
    endDate = moment(endDate, format);

    let dates = [];
    let from = startDate.clone();
    let to = from.clone().add(increment, "month").startOf("month").add(-1, "day");
    do {
        dates.push({
            "from": from.format(format),
            "to": ( to < endDate ) ? to.format(format) : endDate.format(format)
        });
        from = moment(to, format).add(1, "day").clone();
        to = from.clone().add(increment, "month").startOf("month").add(-1, "day");
    } while ( from < endDate );
    return dates;
}

Please remember, .clone() is crucial in momentjs to avoid value overwriting. This seems important in your scenario.

This approach is more versatile for obtaining a series of dates within a specific range.

Answer 18

const dateList = retrieveDatesInRange("2014-05-02", "2018-05-12", "YYYY/MM/DD", 1);           
console.log(dateList);
// receive complete date ranges based on input
var startDatesOnly = dateList.map(dateObject => dateObject["to"]);
console.log(startDatesOnly);
// additionally, if you only need starting dates then use the "map" function

function retrieveDatesInRange( startDate, endDate, format, increment ) {
    startDate = moment(startDate, format);
    endDate = moment(endDate, format);

    let dates = [];
    let from = startDate.clone();
    let to = from.clone().add(increment, "month").startOf("month").add(-1, "day");
    do {
        dates.push({
            "from": from.format(format),
            "to": ( to < endDate ) ? to.format(format) : endDate.format(format)
        });
        from = moment(to, format).add(1, "day").clone();
        to = from.clone().add(increment, "month").startOf("month").add(-1, "day");
    } while ( from < endDate );
    return dates;
}

Please remember, .clone() is crucial in momentjs to avoid value overwriting. This seems important in your scenario.

This approach is more versatile for obtaining a series of dates within a specific range.

Answer 19

Answer №10

Below is a succinct and precise solution:

  // Note: the month in 'moment' library starts from 0, so January is actually represented by 0, subtracting 1 accounts for this discrepancy.
  var startDate = moment([year, month - 1]).format()    
  var endDate = moment(startDate).clone().endOf('month').format()

For example:

let month = 1         // Represents January   
let year = 2021  

var startDate = moment([year, month - 1]).format()

var endDate = moment(startDate).clone().endOf('month').format()

console.log(startDate)
// Output: 2021-01-01T00:00:00-07:00

console.log(endDate)
// Output: 2021-01-31T23:59:59-07:00

Answer 20

Below is a succinct and precise solution:

  // Note: the month in 'moment' library starts from 0, so January is actually represented by 0, subtracting 1 accounts for this discrepancy.
  var startDate = moment([year, month - 1]).format()    
  var endDate = moment(startDate).clone().endOf('month').format()

For example:

let month = 1         // Represents January   
let year = 2021  

var startDate = moment([year, month - 1]).format()

var endDate = moment(startDate).clone().endOf('month').format()

console.log(startDate)
// Output: 2021-01-01T00:00:00-07:00

console.log(endDate)
// Output: 2021-01-31T23:59:59-07:00

Answer 21

Answer №11

Here is the code snippet that should be functional:

$('#reportrange').daterangepicker({
                startDate: start,
                endDate: end,
                ranges: {
                    'Today': [moment(), moment()],
                    'Yesterday': [moment().subtract(1, 'days'), moment().subtract(1, 'days')],
                    'Last 7 days': [moment().subtract(6, 'days'), moment()],
                    'Last 30 days': [moment().subtract(29, 'days'), moment()],
                    'Current Month': [moment().startOf('month'), moment().endOf('month')],
                    'Previous Month': [moment().subtract(1, 'month').startOf('month'), moment().subtract(1, 'month').endOf('month')],
                    'January': [moment().month(0).startOf('month') , moment().month(0).endOf('month')],
                    'February': [moment().month(1).startOf('month') , moment().month(1).endOf('month')],
                    'March': [moment().month(2).startOf('month') , moment().month(2).endOf('month')],
                    'April': [moment().month(3).startOf('month') , moment().month(3).endOf('month')],
                    'May': [moment().month(4).startOf('month') , moment().month(4).endOf('month')],
                    'June': [moment().month(5).startOf('month') , moment().month(5).endOf('month')],
                    'July': [moment().month(6).startOf('month') , moment().month(6).endOf('month')],
                    'August': [moment().month(7).startOf('month') , moment().month(7).endOf('month')],
                    'September': [moment().month(8).startOf('month') , moment().month(8).endOf('month')],
                    'October': [moment().month(9).startOf('month') , moment().month(9).endOf('month')],
                    'November': [moment().month(10).startOf('month') , moment().month(10).endOf('month')],
                    'December': [moment().month(11).startOf('month') , moment().month(11).endOf('month')]
                }
            }, cb);

Answer 22

Here is the code snippet that should be functional:

$('#reportrange').daterangepicker({
                startDate: start,
                endDate: end,
                ranges: {
                    'Today': [moment(), moment()],
                    'Yesterday': [moment().subtract(1, 'days'), moment().subtract(1, 'days')],
                    'Last 7 days': [moment().subtract(6, 'days'), moment()],
                    'Last 30 days': [moment().subtract(29, 'days'), moment()],
                    'Current Month': [moment().startOf('month'), moment().endOf('month')],
                    'Previous Month': [moment().subtract(1, 'month').startOf('month'), moment().subtract(1, 'month').endOf('month')],
                    'January': [moment().month(0).startOf('month') , moment().month(0).endOf('month')],
                    'February': [moment().month(1).startOf('month') , moment().month(1).endOf('month')],
                    'March': [moment().month(2).startOf('month') , moment().month(2).endOf('month')],
                    'April': [moment().month(3).startOf('month') , moment().month(3).endOf('month')],
                    'May': [moment().month(4).startOf('month') , moment().month(4).endOf('month')],
                    'June': [moment().month(5).startOf('month') , moment().month(5).endOf('month')],
                    'July': [moment().month(6).startOf('month') , moment().month(6).endOf('month')],
                    'August': [moment().month(7).startOf('month') , moment().month(7).endOf('month')],
                    'September': [moment().month(8).startOf('month') , moment().month(8).endOf('month')],
                    'October': [moment().month(9).startOf('month') , moment().month(9).endOf('month')],
                    'November': [moment().month(10).startOf('month') , moment().month(10).endOf('month')],
                    'December': [moment().month(11).startOf('month') , moment().month(11).endOf('month')]
                }
            }, cb);

Answer 23

Answer №12

Give this code a shot:

moment(dateStart).beginningOf('months')
moment(dateStart).stopOf('months')

Answer 24

Give this code a shot:

moment(dateStart).beginningOf('months')
moment(dateStart).stopOf('months')

Finding the start and end dates of a specific month using Moment JS

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Answer №8

Answer №9

Answer №10

Answer №11

Answer №12

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