javascript - Moment is not adding day - Stack Overflow

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I have the following javascript:

const to = moment(item.to);
const toNextDay = to.add(1, 'days');

item.to is a string that has the following format:

"2020-06-30T00:00:00"

But is not adding the next day, that would be "2020-07-01T00:00:00"

This is the Function:

  private getCurrentRecord(records: ConfigRecord[]) {
    let result: string = null;
    for (let index = records.length - 1; index >= 0; index--) {
      const item = records[index];

      if (item.from && item.to) {

        const from = moment(item.from);
        const to = moment(item.to).add(1, 'days');
        const today = moment();
        console.log(today.format());
        if (from <= today && today < to) {
          result = item.value;
          break;
        }
      }
    }
    return result;
  }

I have the following javascript:

const to = moment(item.to);
const toNextDay = to.add(1, 'days');

item.to is a string that has the following format:

"2020-06-30T00:00:00"

But is not adding the next day, that would be "2020-07-01T00:00:00"

This is the Function:

  private getCurrentRecord(records: ConfigRecord[]) {
    let result: string = null;
    for (let index = records.length - 1; index >= 0; index--) {
      const item = records[index];

      if (item.from && item.to) {

        const from = moment(item.from);
        const to = moment(item.to).add(1, 'days');
        const today = moment();
        console.log(today.format());
        if (from <= today && today < to) {
          result = item.value;
          break;
        }
      }
    }
    return result;
  }

• javascript
• momentjs

Share Improve this question Follow edited Jun 4, 2020 at 15:29 user3442470 asked Jun 4, 2020 at 15:18 user3442470user3442470 43922 gold badges77 silver badges2121 bronze badges 6

• Can you add to a constant? I'm not sure of this rule in javascript, but I'd try making it non-constant. If this works, please notify me, and I'll 'promote' this ment to an answer. – JosephDoggie Commented Jun 4, 2020 at 15:20
• See also stackoverflow./questions/563406/add-days-to-javascript-date -- I'd just make the entity a 'var' not a constant … see my ment above – JosephDoggie Commented Jun 4, 2020 at 15:23
• 1 Hello, I tried using 'let' but tslint from Angular is saying that the value is never reassigned, which is true. Also I tried using var but tslint is telling me this: "Forbidden 'var' keyword, use 'let' or 'const' instead (no-var-keyword)". Also, is not working with var – user3442470 Commented Jun 4, 2020 at 15:26
• 1 @JosephDoggie const just means that the reference itself is immutable, it doesn't say anything about the mutability of the object it refers to. – Thomas Commented Jun 4, 2020 at 15:31
• 1 Consider using moment's isSameOrBefore and isBefore functions rather than <= and < operators; that way you can tell it the level of granularity you want (right now it pares down to the millisecond, but you may only care about paring down to the day). – Heretic Monkey Commented Jun 4, 2020 at 15:44

 |  Show 1 more ment

3 Answers 3

Sorted by: Reset to default 4

Try this one:

const to = moment("2020-06-30T00:00:00");
const toNextDay = moment(to.add(1, 'days').toDate());

As moment is modifying the original moment object, either use toString() or toDate() to get the modified date.

const to = moment("2020-06-30T00:00:00");
const toNextDay = moment(to.add(1, 'days').toDate());
console.log('In local time => ', toNextDay.toString());

const toUTC = moment.utc("2020-06-30T00:00:00");
const toNextDayUTC = moment.utc(toUTC.add(1, 'days').toDate());
console.log('In UTC => ', toNextDayUTC.toString());

<script src="https://momentjs./downloads/moment.min.js"></script>

Check the rest of the code because this part is correct

const to = moment("2020-06-30T00:00:00")

//undefined

to.format()

//"2020-06-30T00:00:00+02:00"

const nextDay = to.add(1, "day")

//undefined

nextDay.format()

//"2020-07-01T00:00:00+02:00"

to.format()

//"2020-07-01T00:00:00+02:00"

A little warning, Moment.add() mutates the moment so after to.add(1, "day") to and nextDay are the same date, 2020-07-01. Use to.clone().add(1, "day") if you don't want to lose the original moment

Try the following. Parse the string using moment's second argument then use add() to add the specified number of days

var input = "2020-06-30T00:00:00";
let addDay = moment(input, "YYYY-MM-DD hh:mm:ss").add(1, "days");
console.log(addDay.format("YYYY-MM-DDTHH:mm:ss"));

<script src="https://momentjs./downloads/moment.js"></script>

I have the following javascript:

const to = moment(item.to);
const toNextDay = to.add(1, 'days');

item.to is a string that has the following format:

"2020-06-30T00:00:00"

But is not adding the next day, that would be "2020-07-01T00:00:00"

This is the Function:

  private getCurrentRecord(records: ConfigRecord[]) {
    let result: string = null;
    for (let index = records.length - 1; index >= 0; index--) {
      const item = records[index];

      if (item.from && item.to) {

        const from = moment(item.from);
        const to = moment(item.to).add(1, 'days');
        const today = moment();
        console.log(today.format());
        if (from <= today && today < to) {
          result = item.value;
          break;
        }
      }
    }
    return result;
  }

I have the following javascript:

const to = moment(item.to);
const toNextDay = to.add(1, 'days');

item.to is a string that has the following format:

"2020-06-30T00:00:00"

But is not adding the next day, that would be "2020-07-01T00:00:00"

This is the Function:

  private getCurrentRecord(records: ConfigRecord[]) {
    let result: string = null;
    for (let index = records.length - 1; index >= 0; index--) {
      const item = records[index];

      if (item.from && item.to) {

        const from = moment(item.from);
        const to = moment(item.to).add(1, 'days');
        const today = moment();
        console.log(today.format());
        if (from <= today && today < to) {
          result = item.value;
          break;
        }
      }
    }
    return result;
  }

• javascript
• momentjs

Share Improve this question Follow edited Jun 4, 2020 at 15:29 user3442470 asked Jun 4, 2020 at 15:18 user3442470user3442470 43922 gold badges77 silver badges2121 bronze badges 6

• Can you add to a constant? I'm not sure of this rule in javascript, but I'd try making it non-constant. If this works, please notify me, and I'll 'promote' this ment to an answer. – JosephDoggie Commented Jun 4, 2020 at 15:20
• See also stackoverflow./questions/563406/add-days-to-javascript-date -- I'd just make the entity a 'var' not a constant … see my ment above – JosephDoggie Commented Jun 4, 2020 at 15:23
• 1 Hello, I tried using 'let' but tslint from Angular is saying that the value is never reassigned, which is true. Also I tried using var but tslint is telling me this: "Forbidden 'var' keyword, use 'let' or 'const' instead (no-var-keyword)". Also, is not working with var – user3442470 Commented Jun 4, 2020 at 15:26
• 1 @JosephDoggie const just means that the reference itself is immutable, it doesn't say anything about the mutability of the object it refers to. – Thomas Commented Jun 4, 2020 at 15:31
• 1 Consider using moment's isSameOrBefore and isBefore functions rather than <= and < operators; that way you can tell it the level of granularity you want (right now it pares down to the millisecond, but you may only care about paring down to the day). – Heretic Monkey Commented Jun 4, 2020 at 15:44

 |  Show 1 more ment

3 Answers 3

Sorted by: Reset to default 4

Try this one:

const to = moment("2020-06-30T00:00:00");
const toNextDay = moment(to.add(1, 'days').toDate());

As moment is modifying the original moment object, either use toString() or toDate() to get the modified date.

const to = moment("2020-06-30T00:00:00");
const toNextDay = moment(to.add(1, 'days').toDate());
console.log('In local time => ', toNextDay.toString());

const toUTC = moment.utc("2020-06-30T00:00:00");
const toNextDayUTC = moment.utc(toUTC.add(1, 'days').toDate());
console.log('In UTC => ', toNextDayUTC.toString());

<script src="https://momentjs./downloads/moment.min.js"></script>

Check the rest of the code because this part is correct

const to = moment("2020-06-30T00:00:00")

//undefined

to.format()

//"2020-06-30T00:00:00+02:00"

const nextDay = to.add(1, "day")

//undefined

nextDay.format()

//"2020-07-01T00:00:00+02:00"

to.format()

//"2020-07-01T00:00:00+02:00"

A little warning, Moment.add() mutates the moment so after to.add(1, "day") to and nextDay are the same date, 2020-07-01. Use to.clone().add(1, "day") if you don't want to lose the original moment

Try the following. Parse the string using moment's second argument then use add() to add the specified number of days

var input = "2020-06-30T00:00:00";
let addDay = moment(input, "YYYY-MM-DD hh:mm:ss").add(1, "days");
console.log(addDay.format("YYYY-MM-DDTHH:mm:ss"));

<script src="https://momentjs./downloads/moment.js"></script>

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