1872333 - Day of month overflow should be parsed as an ISO style date

Status: RESOLVED FIXED

(Core :: JavaScript: Standard Library, defect)

Description

[Vinny Diehl]

When day of month overflows the number of days in that actual month, we simply skip to the next month. For example, Feb 31 on a non-leap year becomes Mar 3. An overflowed date like this doesn't violate the Date Time String Format, which simply calls for a number 01-31 for DD, however, we don't parse these overflows as a spec date, which Chrome does:

Input	JavaScriptCore	SpiderMonkey	V8
"2009-02-31"	Invalid Date	Tue Mar 03 2009 00:00:00 GMT-0700 (Mountain Standard Time)	Mon Mar 02 2009 17:00:00 GMT-0700 (Mountain Standard Time)
"2009-02-31T00:00"	Invalid Date	Invalid Date	Tue Mar 03 2009 00:00:00 GMT-0700 (Mountain Standard Time)

The spec doesn't say what to do when DD overflows, so I don't believe we are in violation, however this discrepancy is preventing us from being able to use ParseISOStyleDate to accurately detect whether a string follows the spec format over in bug 1872116.

Comment 1

[Vinny Diehl]

Attachment: Bug 1872333 - Parse mday overflow as ISO style date r?arai

Depends on D197046

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/a0496a30342e
Parse mday overflow as ISO style date r=arai

Comment 3

[Cosmin Sabou [:CosminS]]

https://hg.mozilla.org/mozilla-central/rev/a0496a30342e

Comment 4

[Dave Letorey]

• Content PR
• Firefox Release PR