• Jakob Ovrum (6/6) Apr 21 2015 std.datetime contains parseRFC822DateTime to convert from an
• Jonathan M Davis via Digitalmars-d-learn (13/19) Apr 21 2015 No, it does not contain the reverse. It was added specifically for the
• Jakob Ovrum (5/37) Apr 21 2015 I needed it for the If-Modified-Since HTTP header, through

"Jakob Ovrum" <jakobovrum gmail.com> writes:

std.datetime contains parseRFC822DateTime to convert from an 
RFC822/RFC5322 formatted string (ala "Sat, 6 Jan 1990 12:14:19 
-0800") to a SysTime.

Does it contain anything for the converse - converting from a 
SysTime to "Sat, 6 Jan 1990 12:14:19 -0800"?

If not, should it?

Jonathan M Davis via Digitalmars-d-learn writes:

On Tuesday, April 21, 2015 08:14:10 Jakob Ovrum via Digitalmars-d-learn wrote:
 std.datetime contains parseRFC822DateTime to convert from an
 RFC822/RFC5322 formatted string (ala "Sat, 6 Jan 1990 12:14:19
 -0800") to a SysTime.

 Does it contain anything for the converse - converting from a
 SysTime to "Sat, 6 Jan 1990 12:14:19 -0800"?

 If not, should it?

No, it does not contain the reverse. It was added specifically for the
installer. If it weren't for that, std.datetime wouldn't support it at all.
It's a horrible format that should just die. The only reason to use it is
because the e-mail spec (and thus specs like HTTP) unfortunately uses it.
However, anyone that's going to need to generate the format for anything
like that is going to need a lot more than that that Phobos doesn't provide
anyway, so I really don't think that it's much of a loss. Regardless, I'm
strongly of the opinion that anything dealing with that format should be
restricted to a library for e-mail or HTTP, and if it weren't for the fact
that the installer needed to be able to read it (I forget why), I would have
argued strongly against adding parseRFC822DateTime to Phobos.

- Jonathan M Davis

"Jakob Ovrum" <jakobovrum gmail.com> writes:

On Tuesday, 21 April 2015 at 10:28:32 UTC, Jonathan M Davis wrote:
 On Tuesday, April 21, 2015 08:14:10 Jakob Ovrum via 
 Digitalmars-d-learn wrote:
 std.datetime contains parseRFC822DateTime to convert from an
 RFC822/RFC5322 formatted string (ala "Sat, 6 Jan 1990 12:14:19
 -0800") to a SysTime.

 Does it contain anything for the converse - converting from a
 SysTime to "Sat, 6 Jan 1990 12:14:19 -0800"?

 If not, should it?

 No, it does not contain the reverse. It was added specifically 
 for the
 installer. If it weren't for that, std.datetime wouldn't 
 support it at all.
 It's a horrible format that should just die. The only reason to 
 use it is
 because the e-mail spec (and thus specs like HTTP) 
 unfortunately uses it.
 However, anyone that's going to need to generate the format for 
 anything
 like that is going to need a lot more than that that Phobos 
 doesn't provide
 anyway, so I really don't think that it's much of a loss. 
 Regardless, I'm
 strongly of the opinion that anything dealing with that format 
 should be
 restricted to a library for e-mail or HTTP, and if it weren't 
 for the fact
 that the installer needed to be able to read it (I forget why), 
 I would have
 argued strongly against adding parseRFC822DateTime to Phobos.

 - Jonathan M Davis

I needed it for the If-Modified-Since HTTP header, through 
std.net.curl.HTTP.addRequestHeader.

Phobos has HTTP support and this is the preferred date format 
according to spec. Phobos should support it.