Javascript Date parse()

Introduction

The method Date.parse(str) can create a date from a string.

The call to Date.parse(str) parses the string in the given format.

It returns the timestamp as number of milliseconds from 1 Jan 1970 UTC+0.

If the format is invalid, returns NaN.

Direct call: 

Date.parse(dateString)

Implicit call: 

new Date(dateString)

Parameters

  • dateString - A string representing a simplification of the ISO 8601 calendar date extended format. Other formats may be used, but results are implementation-dependent.

Return value

A number representing the milliseconds elapsed since January 1, 1970, 00:00:00 UTC.

It is the date obtained by parsing the given string representation of a date.

If the argument doesn't represent a valid date, NaN is returned.

The string format should be: YYYY-MM-DDTHH:mm:ss.sssZ, where:

Value Meaning
YYYY-MM-DD the date: year-month-day.
"T" the delimiter.
HH:mm:ss.sss the time: hours, minutes, seconds and milliseconds.
optional 'Z' denotes the time zone in the format +-hh:mm. A single letter Z that would mean UTC+0.

Date.parse(str) supports the shorter variants: YYYY-MM-DD or YYYY-MM or YYYY.

For instance: 

let ms = Date.parse('2020-02-24T15:54:50.123-07:00');
console.log(ms);

We can create a new Date object from the timestamp: 

let date = new Date( Date.parse('2020-01-24T13:45:50.123-07:00') );
console.log(date);

More example 

var d = Date.parse("March 21, 2012");
console.log(d);



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