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To whom it may concern,

On 3/11/13 11:17 AM, getridofthespam wrote:
> Google didn't give any relevant info so I try here.
> 
> I traced a tomcat request and noticed there where two different
> date formats in the last-modified header: 2012-12-13T09:52:02Z and 
> Mon, 07 Jan 2013 21:49:08 GMT
> 
> What determines the format and where do the differences come from?

RFC 2616 (HTTP)[1] does not directly reference RFC 2822 (Internet
Message Format), but that's the format that's being used -- covered in
section 3.3 [2]. That's where the format that begins with the day-of-week.

I'm surprised that Tomcat ever emits anything that looks like
yyyyMMddTHHmmssZZ -- that's ISO 8601 date formats. Since ISO 8601
predates HTTP, I'm not sure why that wasn't chosen. But HTTP has some
old crap that should have never been put into the protocol from day
one, so why not an insane date format specification?

- -chris

[1] http://tools.ietf.org/html/rfc2616#section-13.3.1
[2] http://tools.ietf.org/html/rfc2822#section-3.3
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