How to Parse a Date Without a Timezone in JavaScript?

How to Parse Date Without Timezone in JavaScript

Parsing dates without timezones can be challenging in JavaScript. Attempts such as:

<code class="javascript">new Date(Date.parse("2005-07-08T00:00:00+0000"));
new Date(Date.parse("2005-07-08 00:00:00 GMT+0000"));
new Date(Date.parse("2005-07-08 00:00:00 GMT-0000"));</code>

all return a date with the Central European Daylight Time (GMT 0200) offset. This is because JavaScript interprets dates without timezones as being in the local timezone.

To parse a date without a timezone and without using a constructor, you can use the following technique:

<code class="javascript">var date = new Date('2016-08-25T00:00:00');
var userTimezoneOffset = date.getTimezoneOffset() * 60000;
var utcDate = new Date(date.getTime() + userTimezoneOffset);</code>

The getTimezoneOffset() method returns the user's timezone offset in minutes. Multiplying this value by 60000 converts it to milliseconds, which can be added to the date's getTime() value to create a UTC Date object.

This technique will work for all timezones and can be used to parse dates without constructors or prototype approaches.

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