CODEWITHSUNDEEP
javascriptmomentjs
Profer
Profer

Reputation: 643

Convert current time to milliseconds using moment

Suppose I have this time

'2018-08-03T15:53:57.000Z'

I need to convert only the time part to milliseconds

I tried this but didn't work and throws error

moment.utc("2018-08-03T15:53:57.000Z").format('HH:mm:ss').milliseconds()

Error 

TypeError: (0 , _moment2.default)(...).format(...).milliseconds is not a function

Can someone please help how can I convert only time to millisecond?

Thank you!!!

Upvotes: 4

Views: 7277

Answers (4)

codejockie
codejockie

Reputation: 10864

Simply do this if you want to get the milliseconds:

const ms = moment.utc("2018-08-03T15:53:57.000Z").valueOf()

Edit: The above is how you could do it in moment since you specifically said "using Moment".

You could also use plain JS without using a library as follows:

const date = new Date("2018-08-03T15:53:57.000Z");

.valueOf()

date.valueOf() // 1533311637000

.getTime()

date.getTime() // 1533311637000

Upvotes: 6

phuzi
phuzi

Reputation: 13059

No need to use moment to do this. The date string can be parsed sufficiently by vanilla JS.

let date = new Date('2018-08-03T15:53:57.000Z');

And to get the timestamp (in milliseconds) of this date;

let millis = date.getTime();

And, since there are 86400 seconds in a day (24*60*60) there are 86,400,000 milliseconds and we can use the remainder after division by this number to get the number of milliseconds the time portion represents. Following is the statement:

let millisToday = millis % 86400000;

UPDATE

Now using getTime() instead of valueOf() as it is the "proper" way to get the timestamp of the Date object.

Upvotes: 1

HMR
HMR

Reputation: 39270

I'll add my answer in case I got it wrong then someone can comment.

If I send new Date().toISOString() to someone in a different time zone then the time will differ for this person. If I ask that person to have a skype call at 13:00 their time it could mean it's 18:00 my local time.

So if the person sending me the date string is from the UK and sends me ...T13:00.000Z That actually means 18:00 for me.

Here is how you can correctly get the time in milliseconds from your midnight of the date converted to your local time:

const date = new Date(2007, 1, 1, 0, 0, 2).toISOString();
console.log('date:',date);
console.log('date in your local time:',new Date(date).toString());
const millisecondsFromMidNight = (date) => {
  var dateObject = new Date(date);
  return (
    dateObject.getTime() -
    new Date(
      dateObject.getFullYear(),
      dateObject.getMonth(),
      dateObject.getDate(),
      0,
      0,
      0,
      0,
    ).getTime()
  );
};
console.log(millisecondsFromMidNight(date));

Example where DST goes in effect:

var minutesFromMidnight = (date) => {
  var dateObject = new Date(date);
  console.log('date:', date);
  console.log(
    'date in your local time:',
    dateObject.toString(),
  );
  return (
    dateObject.getTime() -
    new Date(
      dateObject.getFullYear(),
      dateObject.getMonth(),
      dateObject.getDate(),
      0,
      0,
      0,
      0,
    ).getTime()
  );
};

console.log(
  minutesFromMidnight('2018-10-28T00:59:00.000Z') / 60000,
);
console.log(
  minutesFromMidnight('2018-10-28T01:01:00.000Z') / 60000,
);

Upvotes: 1

Nick6707
Nick6707

Reputation: 69

The function is moment().milliseconds()

Not format().milliseconds

Upvotes: -1

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