Formatting a date in javascript till the millisecond

Use 'S' for milliseconds formatting:

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

It's indicated by an f:

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

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.

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