When creating a moment from a string, we first check if the string matches known ISO 8601 formats, we then check if the string matches the RFC 2822 Date time format before dropping to the fall back of
new Date(string) if a known format is not found.
var day = moment("1995-12-25");
Warning: Browser support for parsing strings is inconsistent. Because there is no specification on which formats should be supported, what works in some browsers will not work in other browsers.
For consistent results parsing anything other than ISO 8601 strings, you should use String + Format.
Supported ISO 8601 strings
An ISO 8601 string requires a date part.
2013-02-08 # A calendar date part 2013-W06-5 # A week date part 2013-039 # An ordinal date part 20130208 # Basic (short) full date 2013W065 # Basic (short) week, weekday 2013W06 # Basic (short) week only 2013050 # Basic (short) ordinal date
A time part can also be included, separated from the date part by a space or a uppercase T.
2013-02-08T09 # An hour time part separated by a T 2013-02-08 09 # An hour time part separated by a space 2013-02-08 09:30 # An hour and minute time part 2013-02-08 09:30:26 # An hour, minute, and second time part 2013-02-08 09:30:26.123 # An hour, minute, second, and millisecond time part 2013-02-08 24:00:00.000 # hour 24, minute, second, millisecond equal 0 means next day at midnight 20130208T080910,123 # Short date and time up to ms, separated by comma 20130208T080910.123 # Short date and time up to ms 20130208T080910 # Short date and time up to seconds 20130208T0809 # Short date and time up to minutes 20130208T08 # Short date and time, hours only
Any of the date parts can have a time part.
2013-02-08 09 # A calendar date part and hour time part 2013-W06-5 09 # A week date part and hour time part 2013-039 09 # An ordinal date part and hour time part
If a time part is included, an offset from UTC can also be included as
2013-02-08 09+07:00 # +-HH:mm 2013-02-08 09-0100 # +-HHmm 2013-02-08 09Z # Z 2013-02-08 09:30:26.123+07:00 # +-HH:mm 2013-02-08 09:30:26.123+07 # +-HH
Note: Automatic cross browser ISO-8601 support was added in version 1.5.0. Support for the week and ordinal formats was added in version 2.3.0.
If a string does not match any of the above formats and is not able to be parsed with
moment#isValid will return false.
moment("not a real date").isValid(); // false
The RFC 2822 date time format
Before parsing a RFC 2822 date time the string is cleansed to remove any comments and/or newline characters. The additional characters are legal in the format but add nothing to creating a valid moment instance.
After cleansing, the string is validated in the following space-separated sections, all using the English language:
6 Mar 17 21:22 UT 6 Mar 17 21:22:23 UT 6 Mar 2017 21:22:23 GMT 06 Mar 2017 21:22:23 Z Mon 06 Mar 2017 21:22:23 z Mon, 06 Mar 2017 21:22:23 +0000
- Day of Week in three letters, followed by an optional comma. (optional)
- Day of Month (1 or 2 digit), followed by a three-letter month and 2 or 4 digit year
- Two-digit hours and minutes separated by a colon (:), followed optionally by another colon and seconds in 2-digits
- Timezone or offset in one of the following formats:
- UT : +0000
- GMT : +0000
- EST | CST | MST | PST | EDT | CDT | MDT | PDT : US time zones*
- A - I | K - Z : Military time zones*
- Time offset +/-9999
[*] See section 4.3 of the specification for details.
The parser also confirms that the day-of-week (when included) is consistent with the date.