如何验证其中包含时区的日期字符串的格式？

Question

If I have a this date: April 14, 2022 14:00 UTC , how I can validate that it is in MMMM DD, YYYY HH:mm <timezone> ?

I tried it with moment but it doesn't have format for timezone.

moment(date, 'MMMM DD, YYYY HH:mm',true).isValid()

How can I validate that the string is in MMMM DD, YYYY HH:mm <timezone> format?

Answer 1

You can include " UTC" as literal text in the parse format, eg

 let date = 'April 14, 2022 14:00 UTC'; console.log( moment(date, 'MMMM DD, YYYY HH:mm[ UTC]',true).isValid() );

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.2/moment.min.js"></script>

Per the moment.js documentation , various offset formats are supported, so if there are other offset representations you can use multiple tests to support say "UTC" and "+00:00" (or ±HH:mm in general), eg

 ['April 14, 2022 14:00 UTC', 'April 14, 2022 14:00 +00:00', 'April 14, 2022 14:00 +05:30' ].forEach(date => console.log(`${date} is valid? ` + `${moment(date, 'MMMM DD, YYYY HH:mm[ UTC]', true).isValid() || moment(date, 'MMMM DD, YYYY HH:mm Z', true).isValid()}` ) );

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.2/moment.min.js"></script>

Unfortunately isValid doesn't support multiple formats in the one call so you can't do:

moment(date, 'MMMM DD, YYYY HH:mm[ UTC]',  'MMMM DD, YYYY HH:mm Z', true).isValid()

as only the first format is recognised.