How to get start and end of day in Javascript?

Question

How to get start ( 00:00:00 ) and end ( 23:59:59 ) of today in timestamp ( GMT )? Computer use a local time.

Answer 1

var start = new Date(); start.setUTCHours(0,0,0,0);  var end = new Date(); end.setUTCHours(23,59,59,999);  alert( start.toUTCString() + ':' + end.toUTCString() ); 

If you need to get the UTC time from those, you can use UTC().

Answer 2

With dayjs library, use startOf and endOf methods as follows:

Local GMT:

const start = dayjs().startOf('day'); // set to 12:00 am today const end = dayjs().endOf('day'); // set to 23:59 pm today 

For UTC:

const utc = require('dayjs/plugin/utc'); dayjs.extend(utc);  const start = dayjs.utc().startOf('day');  const end = dayjs.utc().endOf('day');  

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Using the (deprecated) momentjs library, this can be achieved with the startOf() and endOf() methods on the moment's current date object, passing the string 'day' as arguments:

Local GMT:

var start = moment().startOf('day'); // set to 12:00 am today var end = moment().endOf('day'); // set to 23:59 pm today 

For UTC:

var start = moment.utc().startOf('day');  var end = moment.utc().endOf('day');