add ISO date parsing and toISOString for dates

[tschaub]

The  ECMA-262 (v5) spec defines a toISOString method on date objects. It also specifies the format for the Date.parse method (previously unspecified). The string format follows  RFC 3339, a profile of  ISO 8601 for timestamps on the Internet.

Browsers are beginning to implement ECMA-262. Firefox, for example, currently (3.6.8) implements toISOString and the specified Date.parse format. Safari (5.0) supports toISOString but does not parse the same format for Date.parse. Chrome is similar. IE is hopeless.

We can provide a cross-browser implementation of toISOString and Date.parse and default to the native methods if available.

[tschaub]

date string parsing

[tschaub]

Tests pass in FF 3.6, Safari 5, Chrome 5, and IE 6. Thanks for any review.

[ahocevar]

One of the most impressive patches I have ever seen. Huge test coverage, and a regular expression which I hope you did not make up on your own. Otherwise I should stop writing code :-).

Please commit.

[tschaub]

The regex is my own :) But the process of getting there was iterative. Thanks for the review.

[tschaub]

(In [10630]) Adding OpenLayers.Date utility functions to parse and serialize dates. The date string format parsed complies with ECMA-262 (v5) section 15.9.1.15, derived from the profile of ISO 8601 for date and time on the Internet ( http://tools.ietf.org/html/rfc3339). Where available (and functional) the native date.toISOString and Date.parse methods will be used. r=ahocevar (closes #2778)