Parses the value of the Date header in HTTP responses.
Parses date-times from HTTP headers such as Date, Last-Modified, and Expires. An example of such a date-time is:
Tue, 15 Nov 1994 08:12:31 GMT
The format is defined by HTTP/1.1 (and HTTP/1.0) and is a subset of the specification used by the Internet Message Format.
Install parsehttpdate using npm or Yarn and import the function:
import parseHttpDate from 'parsehttpdate';Alternatively, include parsehttpdate through unpkg:
<script src="https://unpkg.com/parsehttpdate@^1.0.12"></script>This alternative makes the function available at window.parseHttpDate.
parseHttpDate('Wed, 21 Oct 2015 07:28:00 GMT');Combined with fetch
This is how you can determine the time according to your server:
fetch('/')
.then(({ headers }) => headers.get('Date'))
.then(parseHttpDate)
.then(date => {
console.log(date.toTimeString());
});This is the same example using an async function:
async function getServerDate() {
const { headers } = await fetch('/');
return parseHttpDate(headers.get('Date'));
}
getServerDate()
.then(date => {
console.log(date.toTimeString());
});If you are fairly certain the input is formatted correctly, you can squeeze out some extra performance by turning off validation.
parseHttpDate('Wed, 21 Oct 2015 07:28:00 GMT', false);Does your date-time look nothing like the example above, but rather something like this?
1994-11-06T08:49:37Z
Congratulations: your date-time is formatted according to ISO 8601. You don't need this library. You don't need any library:
new Date('1994-11-06T08:49:37Z');The HTTP/1.1 specification defines two obsolete formats besides the preferred format of the examples above:
Sunday, 06-Nov-94 08:49:37 GMT
Sun Nov 6 08:49:37 1994
This library does not support those; the supported format has been the preferred one since 1996. Please create an issue if your use case requires the others.
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