Given a date/time and timezone, how do you convert that into a UTC timestamp?

Question

I am calling an API that returns a date/time string such as "2014-04-30 15:32:01" . On top of this, I have a known timezone that this date/time exists in. I can see from the javascript Date() class has a .UTC() call for this, but that does not seem to accept a timezone as far as I can tell.

Given the date/time string + timezone, how can I convert those into a UTC timestamp?

Answer 1

我建议使用Moment.js和Moment Timezone 。

Answer 2

You can create a timestamp using Date.parse from your local time (RFC2822 date format to include the timezone), create a date from that and use Date.toUTCString to get the UTC time. Not sure if it'll work with day light savings though.

Example: http://jsfiddle.net/3vXV6/ (will alert the date)

References:

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/parse https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toUTCString