On Nov 7, 2009, at 10:56 PM, Kevin Ar18 wrote:
Basically, I'm wondering if it is part of the standard library
somewhere before I code my own.
Page 20 of RFC2616 (HTTP) describes the format(s) for the time
header. It wouldn't be too difficult for me to code up a solution
for the 3 standard formats, but what get's me is the little note
about how some servers may still send badly format time headers. :(
So, I'm curious if this has already been done in the standard Python
library?
The parsedate() function in the rfc822 module does this and claims to
be tolerant of slightly malformed dates, but that module is
deprecated
as of Python 2.5 in favor of the email module which hopefully has an
equivalent function.
Thanks, I'll give 'em a look. :)
Sorry, my mistake -- 2616 != 2822. I'm not sure if there's something
in the standard library for parsing RFC 2616 dates.
When I faced the problem of parsing HTTP dates, I wrote my own
function although this was in an application that was deliberately
unforgiving of invalid input and therefore my code makes no allowances
for it. FWIW, it parsed over 1 million dates without encountering any
that raised an error.
Here it is, written in a time when I obviously didn't have total
respect for PEP 8.
ASCTIME_FORMAT = "%a %b %d %H:%M:%S %Y"
RFC_850_FORMAT = "%A, %d-%b-%y %H:%M:%S GMT"
RFC_1123_FORMAT = "%a, %d %b %Y %H:%M:%S GMT"
def HttpDateToFloat(HttpDateString):
# Per RFC 2616 section 3.3, HTTP dates can come in three flavors --
# Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
# Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
# Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
if not HttpDateString.endswith("GMT"):
date = time.strptime(HttpDateString, ASCTIME_FORMAT)
else:
if "-" in HttpDateString:
# RFC 850 format
date = time.strptime(HttpDateString, RFC_850_FORMAT)
else:
# RFC 822/1123
date = time.strptime(HttpDateString, RFC_1123_FORMAT)
return calendar.timegm(date)
bye
Philip
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