How to set 00:00:00 using moment.js [duplicate]

问题:

This question already has an answer here:

.setHours(0,0,0,0) with moment.js (1 answer)

Closed 3 years ago.

I want to get current date but time should be 00:00:00.000

I've try this:

var m = moment();
m.set({hour:0,minute:0,second:0,millisecond:0});
console.log(m.toISOString());

but I've got: 2016-01-12T23:00:00.000Z why 23 and not 00?

回答1:

Moment.js stores dates it utc and can apply different timezones to it. By default it applies your local timezone. If you want to set time on utc date time you need to specify utc timezone.

Try the following code:

var m = moment().utcOffset(0);
m.set({hour:0,minute:0,second:0,millisecond:0})
m.toISOString()
m.format()

回答2:

var time = moment().toDate();  // This will return a copy of the Date that the moment uses

time.setHours(0);
time.setMinutes(0);
time.setSeconds(0);
time.setMilliseconds(0);

回答3:

You've not shown how you're creating the string 2016-01-12T23:00:00.000Z, but I assume via .format().

Anyway, .set() is using your local time zone, but the Z in the time string indicates zero time, otherwise known as UTC.

https://en.wikipedia.org/wiki/ISO_8601#Time_zone_designators

So I assume your local timezone is 23 hours from UTC?

saikumar's answer showed how to load the time in as UTC, but the other option is to use a .format() call that outputs using your local timezone, rather than UTC.

http://momentjs.com/docs/#/get-set/
http://momentjs.com/docs/#/displaying/format/