Get Seconds from midnight UTC

I simply need the number of seconds from the midnight of the present day.

It's a labyrinth of JS Date methods I can't untangle from.

Date

I already searched for an off-the-shelf snippet. I tried this but it returns local time, not UTC:

let date = new Date(),
d = new Date(Date.UTC(date.getUTCFullYear(), date.getUTCMonth(),
date.getUTCDate(), date.getUTCHours(), date.getUTCMinutes(),
date.getUTCSeconds())),
e = new Date(d),
secsSinceMidnight = Math.floor((e - d.setUTCHours(0,0,0,0)) / 1000);


1 Answer
1

I think you had the right idea, but got lost in the implementation. Your assignment to d is just a very long winded way of creating a copy of date that is equivalent to the assignment to e.

To get "seconds from UTC midnight", create a Date for now and subtract it from a copy that has the UTC hours set to 00:00:00.000.

function secsSinceUTCMidnight()
var d = new Date();
var c = new Date(+d);
return (d - c.setUTCHours(0,0,0,0)) / 1000;


console.log('Seconds since UTC midnight: ' +
secsSinceUTCMidnight().toLocaleString() + 'n' + new Date().toISOString());

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