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Bug 23711 - "The present form of UTC, with leap seconds, is defined only from 1 January 1972 onwards." https://en.wikipedia.org/wiki/Unix_time
Summary: "The present form of UTC, with leap seconds, is defined only from 1 January 1...
Status: RESOLVED WORKSFORME
Alias: None
Product: WHATWG
Classification: Unclassified
Component: HTML (show other bugs)
Version: unspecified
Hardware: Other other
: P3 normal
Target Milestone: Unsorted
Assignee: Ian 'Hixie' Hickson
QA Contact: contributor
URL: http://www.whatwg.org/specs/web-apps/...
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2013-11-03 18:18 UTC by contributor
Modified: 2013-11-13 22:59 UTC (History)
2 users (show)

See Also:

Attachments

Description contributor 2013-11-03 18:18:46 UTC 
Specification: http://www.whatwg.org/specs/web-apps/current-work/multipage/states-of-the-type-attribute.html
Multipage: http://www.whatwg.org/C#date-and-time-state-(type=datetime)
Complete: http://www.whatwg.org/c#date-and-time-state-(type=datetime)
Referrer: http://www.whatwg.org/specs/web-apps/current-work/multipage/

Comment:
"The present form of UTC, with leap seconds, is defined only from 1 January
1972 onwards." https://en.wikipedia.org/wiki/Unix_time

Posted from: 75.131.222.221
User agent: DN Explorer/2.4 (20130210) DNIAS/2.4 (20130210)
Comment 1 Ian 'Hixie' Hickson 2013-11-04 21:56:59 UTC 
That's why the spec says: "Times in dates before the formation of UTC in the mid twentieth century must be expressed and interpreted in terms of UT1 (contemporary Earth solar time at the 0° longitude), not UTC (the approximation of UT1 that ticks in SI seconds). Time before the formation of time zones must be expressed and interpeted as UT1 times with explicit time zones that approximate the contemporary difference between the appropriate local time and the time observed at the location of Greenwich, London."