gave same time on converting Date.now()

Question

I'm looking for something to convert exact time

var arr = [1585287883,1585287876,1585287736,1585287730,1585287725,1585287720];
arr.forEach(val=>{
    console.log(Date(val).toString())
})

This code gave same output in loop. but actually it should gave different time — Ashmit Mittal, Mar 27 '20 at 06:48
@ashmitmittal you forgot to put `new`, new Date(val).toString() — Dickens A S, Mar 27 '20 at 06:50
@JaromandaX they are *seconds* apart. They have to be converted to milliseconds — VLAZ, Mar 27 '20 at 06:50
`console.log(new Date(val).toISOString())` - you'll see the times range from ....21:27.720 to ...21:27.883 ... all within 100 ms — Jaromanda X, Mar 27 '20 at 06:51
answer is given by 2 person, both are correct, up vote it :) — Dickens A S, Mar 27 '20 at 06:53
@ashmitmittal If you don't know in what precision your input values are given, you could define a small helper function and use it to convert to milliseconds first. Something like `const to_milliseconds = (val) => { while ((val % 1000000000000) === val) { val = val * 10; }; return val; };` — oriberu, Mar 27 '20 at 07:29

Ayush Gupta · Accepted Answer · 2020-03-27T06:58:27.077

There are 2 issues with what you posted:

Date -> new Date
The timestamps in javascript should represent milliseconds, currently they represent seconds. You can multiply the timestamps by 1000 when building the date object, to convert seconds to milliseconds.

var arr = [1585287883,1585287876,1585287736,1585287730,1585287725,1585287720];
arr.forEach(val=>{
    console.log(new Date(val*1000).toString())
})

score 0 · Answer 2 · answered Mar 27 '20 at 06:51

The fact is that you're using the wrong input format. Instead of seconds since 1970-01-01, you should use milliseconds.

A JavaScript date is fundamentally specified as the number of milliseconds that have elapsed since midnight on January 1, 1970, UTC. This date and time is the same as the UNIX epoch, which is the predominant base value for computer-recorded date and time values.

Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date

Simply, multiply you're input by 1000 (and use the keyword new ;) )

var arr = [1585287883,1585287876,1585287736,1585287730,1585287725,1585287720];
arr.forEach(val=>{
    console.log(new Date(val * 1000).toString());
})

gave same time on converting Date.now()

2 Answers2