Question 168865 in Javascript Question posted in
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“How do I convert a decimal value to datetime in Javascript?”

I am trying to convert a decimal number to a date object in Javascript. I have tried multiple methods and using moment, but all my conversions are wrong. An example of a value I want to convert is 705623516.402048. I have tried to interpret the int part as seconds and the decimal part as milliseconds, but it has gone wrong too.

I cannot use JQuery, just plain JS or moment

Any help is greatly appreciated

Thanks in advance

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2

Answers


  1. 0

    If that’s supposed to be today’s date, it looks like it’s seconds since 2001-01-01. So you can use Date.setSeconds() to add to that date.

    let seconds = 705623516.402048;
let date = new Date('2001-01-01 00:00:00');
date.setSeconds(date.getSeconds() + seconds);
console.log(date);
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  2. 0

    The time value appears to be microseconds. Based on Barmar’s answer, you can maintain millisecond precision (the best ECMAScript Dates can do currently) using:

    let seconds = 705623516.402048;
let date = new Date(Date.UTC(2001, 0) + seconds * 1e3);

console.log(date);

    Date epochs are typically UTC (though not certainly), hence the use of Date.UTC.

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