Formatting a date in javascript till the millisecond

Question

We are using the following js lib from Microsoft https://ajax.aspnetcdn.com/ajax/4.0/1/MicrosoftAjax.js

var datetimehigh = new Date(2011,01,12,14,45,55,596);

var sDate =  datetimehigh.format("dd/MM/yyyy HH:mm:ss sss");

I cannot get the millisecond part to work.Note that format comes from Microsoft's Mvc Ajax lib.

Answer 1

It's indicated by an f:

"dd/MM/yyyy HH:mm:ss fff"

Answer 2

If you are using the native Date javascript object, you can simply use .toISOString method to get a formatted string with milliseconds:

const date = new Date();
const dateString = date.toISOString(); // "2020-01-06T19:57:12.146Z"

Note that using .toString won't give you milliseconds precision.

Answer 3

Using the date format library, it should be something like this:

var nowMilliseconds = new Date().format("yyyy-mm-dd HH:MM:ss l");

http://blog.stevenlevithan.com/archives/date-time-format

L for milliseconds with two digits

l (minus) for milliseconds with three digits

Answer 4

Use 'S' for milliseconds formatting:

"dd/MM/yyyy HH:mm:ss:SSS"