moment date parsing in JS

Question

Using moment js

var y = moment('2016-01-11T16:00:00');
   console.log('UTC ' + moment().utc().format());
   console.log('Local ' + moment().format());
   console.log(y.format());
   console.log(y.toISOString());

Above code outputs

UTC 2016-07-12T19:54:15Z
Local 2016-07-12T15:54:15-04:00
2016-01-11T16:00:00-05:00
2016-01-11T21:00:00.000Z

Why it is displaying -05:00 offset in y.format().

Because you're not telling it what format you want, so it's giving you the default. See: momentjs.com/docs/#/displaying/format — WillardSolutions
– WillardSolutions, Commented Jul 12, 2016 at 20:11

WillardSolutions · Accepted Answer · 2016-07-12 20:18:37Z

1

.format() is designed to take a parameter that allows you to format the date exactly how you want to display it. Since you don't pass a parameter, it gives you the default, which in this case, shows the timezone (-05:00). Per the docs,

As of version 1.5.0, calling moment#format without a format will default to moment.defaultFormat. Out of the box, moment.defaultFormat is the ISO8601 format YYYY-MM-DDTHH:mm:ssZ.

As of version 2.13.0, when in UTC mode, the default format will return Z as the offset, instead of +00:00.

Check the link for info about formatting a date with .format().

answered Jul 12, 2016 at 20:18

WillardSolutions

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2 Comments

avi Over a year ago

I should have been more clear. When moment().format() prints 2016-07-12T15:54:15-04:00, I understand it defaults to ISO8601 but moment('2016-01-11T16:00:00').format() prints 2016-01-11T16:00:00-05:00 why it is -5 not -4 (It is EST -4 is correct offset). Does it mean it defaults to -5 offset always irrespective of local timezone? or does it not consider daylight saving in which -5 makes sense

avi Over a year ago

did not notice it is JAN 11. so -5 makes sense.

Tavitos · Accepted Answer · 2016-07-12 20:14:50Z

0

moment will default to ISO 8601 (Local time with offset to UTC), have a look a the documentation at moment docs, and more on the standard itself at ISO 8601 Standard

answered Jul 12, 2016 at 20:14

Tavitos

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