Date

The Date general HTTP header contains the date and time at which the message was originated.

fetch('https://httpbin.org/get', {
      'headers': {
        'Date': (new Date()).toUTCString()
      }
    })

Date: <day-name>, <day> <month> <year> <hour>:<minute>:<second> GMT

<day-name>

One of "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", or "Sun" (case-sensitive).

<day>

2 digit day number, e.g. "04" or "23".

<month>

One of "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" (case sensitive).

<year>

4 digit year number, e.g. "1990" or "2016".

<hour>

2 digit hour number, e.g. "09" or "23".

<minute>

2 digit minute number, e.g. "04" or "59".

<second>

2 digit second number, e.g. "04" or "59".

GMT

Greenwich Mean Time. HTTP dates are always expressed in GMT, never in local time.

Date: Wed, 21 Oct 2015 07:28:00 GMT

new Date().toUTCString()
// "Mon, 09 Mar 2020 08:13:24 GMT"

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