如何解析包含时区的日期字符串？

Question

I have date in String:

let day = "12/07/1998 12:30 GMT+4"

How to convert it into a moment date? I tried

let d = moment(day, 'DD/MM/YYYY HH:mm')

But I don't know how to parse the timezone. I could not find it in the documentation

Answer 1

Updated 2018/11/6:

Newer versions of moment expect you to pass timezone format as one of these two options:

ZZ=> -07:00 -06:00 ... +06:00 +07:00

Or

Z => -0700 -0600 ... +0600 +0700

Read More Here..

So we need to repair our given GMT+4 format to match the input case we will use some regex and es6 templating to reformat our given date like this: DD/MM/YYYY hh:mm ZZ notice 'ZZ' at the end:

Demo:

 let date = "12/07/1998 12:30 GMT+4" let justDayAndTime = date.split(/(GMT(\\+|\\-)\\d+)/)[0].trim() let zone = date.match(/\\d+$/)[0] let mark = date.match(/(\\+|\\-)/)[0] let parsed = `${justDayAndTime} ${mark}${moment(zone,"k").format("HH:mm")}` let result = moment(parsed,"DD/MM/YYYY hh:mm ZZ") console.log(result.format('LLLL')) 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.2/moment.min.js"></script> 

---

Answer:

You can use the format method

 moment("12/07/1998 12:30 GMT+4").format('DD/MM/YYYY HH:mm') 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.2/moment.min.js"></script> 

For more Time Zone control:

https://momentjs.com/timezone/

Answer 2

Moment.js doesn't necessarily parse the timezone if the string isn't in either ISO 8601 or RFC 2822 formats. It expects the timezone to be in ±HHmm format, so GMT+4 is ignored.

If you pass the string to the constructor with no format information, you'll get a warning and maybe it will be parsed correctly and maybe it wont.

If you can't fix the input format at the source, you can fix it at your end (provided you know the format), then provide "Z" in the parse tokens, eg:

 /* Fix offset like GMT+4 to +0400 * If offset is 1 digit, pad to 0d00 -8 -> -0800 * If offset is 2 digits, pad to dd00 +10 -> +1000 * If offset is 3 digits, padd to 0ddd +530 -> +0530 * If offset is 4 digits, leave as is +1030 -> +1030 */ function fixOffset(s) { var tz = s.match(/(GMT)([+-])(\\d+)$/); // If not required format, do nothing if (tz.length != 4) return; var h = tz[3]; var offset = h.length == 1? '0' + h + '00' : h.length == 2? h + '00' : h.length == 3? '0' + h : h; return s.replace(/GMT[+-]\\d+$/, tz[2] + offset); } var s = "12/07/1998 12:30 GMT+4"; s = fixOffset(s); console.log('Fixed format: ' + s); console.log( moment(s,'DD/MM/YYYY HH:mm Z').format('LLLL') ); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.2/moment.min.js"></script> 

Answer 3

The best way to parse Timezones string, is to use moment timezone. You have to do like this moment.tz(day)