javascript add 1ms to a string date

Question

I have a var in js which is represented like so: "lastTimeModified": "2019-02-26T11:38:20.222Z"

and I want to add to it 1ms

I have tried something like this:

dateObj = new Date();
dateObj.setMilliseconds(1);
var newDate = lastTimeModified + dateObj

but that doesn't seem to work.

I'm curious, what's the use case? If you're trying to use datetimes as unique identifiers, that is bound to fail. — John Dvorak, May 26 '20 at 09:34
@johnDvorak I have records in my db, and I need to add 1ms to all of them — StackerSapper, May 26 '20 at 10:45
@JohnDvorak something related to business logic. that specific field needs to be updated by 1ms — StackerSapper, May 26 '20 at 11:01

Ankur Parihar · Answer 1 · 2020-05-27T05:26:06.333

3

If you can get your date in milliseconds than you can directly add 1 millisecond to it

var date = new Date(lastTimeModified)    // convert string to date object
var mill = date.getMilliseconds()        // Get millisecond value from date
mill += 1                                // Add your one millisecond to it
date.setMilliseconds(mill)               // convert millisecond to again date object

edited May 27 '20 at 05:26

answered May 26 '20 at 09:33

Ankur Parihar

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`date.setMilliseconds(date.getMilliseconds() + 1)` is a little less to type. :-) – RobG May 26 '20 at 20:28
@RobG true. I didn't knew about these methods! Thanks for update :) – Ankur Parihar May 27 '20 at 05:23

score 0 · Answer 2 · answered May 26 '20 at 09:32

0

The below takes your time string turns it into a date object, gets the milliseconds since the 1. of January 1970 adds 1ms and turns it back into a date object

var newDate = new Date(new Date(lastTimeModified).getTime() + 1)

answered May 26 '20 at 09:32

lusc

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javascript add 1ms to a string date

2 Answers2