Add some Date-related abstract operations

[mathiasbynens]

No description provided.

[domenic]

Fascinating, I've never seen that section of the spec before.

Lovely work, matching the existing coding and documentation style exactly. Will merge and release a new minor version.

[domenic]

Getting a test failure:

1. Abstract operations DateFromTime should return the date number for a given time value:
   AssertionError: "undefined" === 1

[mathiasbynens]

Hmm, the tests are passing for me, so it might be (?) a timezone/locale-related issue caused by the use of new Date(…) in YearFromTime. I’ll look into it.

[mathiasbynens]

New York (GMT-5)

> var d = new Date(946684800000);
> d.toISOString();
'2000-01-01T00:00:00.000Z'
> d
Fri Dec 31 1999 19:00:00 GMT-0500 (EST)
> d.getFullYear();
1999

Belgium (GMT+1)

> var d = new Date(946684800000);
> d.toISOString();
'2000-01-01T00:00:00.000Z'
> d
Sat Jan 01 2000 01:00:00 GMT+0100 (CET)
> d.getFullYear();
2000

The solution is to use Date#getUTCFullYear instead of Date#getFullYear. PR updated.

[domenic]

Released as 1.7.0!