How to format default date in javascript?

Question

I'm trying to format an string date that looks like this:

Tue Mar 13 2018 00:00:00 GMT-0600 (Mountain Daylight Time)}

to:

"2018-03-13T00:00:00",

Can anyone tell me what I'm missing or need to add? Thanks a lot in advance!

let someDate = 'Tue Mar 13 2018 00:00:00 GMT-0600 (Mountain Daylight Time)}';

console.log(someDate.replace(/T.+$/, "T00:00:00"));

Be aware removing the time zone is a very bad idea. It can mean any other tool using the date, will be off by a day. — enf0rcer
– enf0rcer, Commented Dec 13, 2018 at 19:26

ic3b3rg · Accepted Answer · 2018-12-13 20:57:02Z

0

let someDate = 'Tue Mar 13 2018 00:00:00 GMT-0600 (Mountain Daylight Time)';

console.log(new Date(someDate).toISOString().replace(/T.+$/, "T00:00:00"));

edited Dec 13, 2018 at 20:57

answered Dec 13, 2018 at 19:24

ic3b3rg

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6 Comments

ic3b3rg Over a year ago

@RobG removing the timezone is part of the requirements - I made the assumption that the date is parsed in the same timezone that the date string was created, in which case the date is not changed.

RobG Over a year ago

In new Date(Date.parse(someDate)), Date.parse is redundant. The only timezone where this does not change the Date is GMT. In my timezone, it represents 16:00 on 13 March but the string appears as 00:00:00.

ic3b3rg Over a year ago

@RobG you're correct that Date.parse is unnecessary - thank you, I updated my answer. You're incorrect about the date changing - test by changing the date string to reflect your time zone. My comment about removing the timezone was in reference to your earlier comment about my answer not being a good solution, which you have since deleted.

RobG Over a year ago

It's still not a good solution as it will change the date for the period within the local timezone offset of midnight, and will always change the time if the local timezone is not GMT. You're just hard coding it to 0000h.

ic3b3rg Over a year ago

@RobG That is incorrect - test it with a date string in your time zone

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susan adelokiki · Accepted Answer · 2018-12-13 19:27:43Z

0

someDate.toISOString() will give you the date in ISO format

answered Dec 13, 2018 at 19:27

susan adelokiki

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