2.5.5 Dates and times
The section describes date values using strictly the Gregorian calendar. As long as the values are strictly internal (as a means of representing incremental or floating time values, cf. our note Working With Time Zones), this doesn't represent a barrier to the use of other calendric systems. Please include a note indicating this so that international users understand why Gregorian is used here.
Gregorian is used here pretty, as opposed to any other calendar system, much arbitrarily. What reason would you give?
This bug was cloned to create bug 17853 as part of operation convergence.
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Rationale: adopted change to WHATWG specification both for HTML5 and HTML5.1
The I18N WG is satisfied by this change.