使用date-functions.js库解析为UTC / GMT时间

Question

Doing this with the date-functions.js library (used eg in datetimepicker jQuery plugin):

Date.parseDate('2018-03-10 12:12', 'Y-m-d H:i')

gives:

Sat Mar 10 2018 12:12:00 GMT+0100 (Paris, Madrid)

How to get the result as Unix timestamp or GMT / UTC time instead?

Answer 1

A string like '2018-03-10 12:12' will usually be parsed as local as there is no timezone offset. It's also not ISO 8601 compliant so using the built-in parser will yield different results in different browsers.

While you can use a library, to parse it as UTC and get the time value is just 2 lines of code:

 function toUTCTimeValue(s) { var b = s.split(/\\D/); return Date.UTC(b[0],b[1]-1,b[2],b[3],b[4]); } // As time value console.log(toUTCTimeValue('2018-03-10 12:12')); // Convert to Date object and print as timestamp console.log(new Date(toUTCTimeValue('2018-03-10 12:12')).toISOString()); 

Answer 2

Use MomentJS instead. You can specify exactly what format the string you're parsing is in. MomentJS can then provide you with the underlying Date object, unix timestamp as well as convert to UTC.

 var d = moment('2018-03-10 12:12', 'YYYY-MM-DD HH:mm'); console.log(d.toDate()); console.log(d.unix()); console.log(d.utc().toDate()); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.21.0/moment.min.js"></script> 

You could of course also parse the date as UTC too instead of treating it as a local time.

moment.utc('2018-03-10 12:12', 'YYYY-MM-DD HH:mm');

NOTE Bit difficult for me to test UTC as I'm in the UK and GMT and UTC are virtually the same.

Answer 3

 var date = new Date('2018-03-10 12:12'.replace(' ', 'T')); // Unix console.log(Math.floor(date.getTime() / 1000)); // UTC console.log(date.toUTCString()); 

As always, please have a look at the documentation at MDN: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date