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curl_getdate(3)                 libcurl Manual                 curl_getdate(3)



NAME
       curl_getdate - Convert a date string to number of seconds since January 1, 1970

SYNOPSIS
       #include <curl/curl.h>

       time_t curl_getdate(char *datestring, time_t *now );

DESCRIPTION
       This  function returns the number of seconds since January 1st 1970 in the UTC time zone, for the date and time
       that the datestring parameter specifies. The now parameter is not used, pass a NULL there.

       NOTE: This function was rewritten for the 7.12.2 release and this documentation covers the functionality of the
       new one. The new one is not feature-complete with the old one, but most of the formats supported by the new one
       was supported by the old too.

PARSING DATES AND TIMES
       A "date" is a string containing several items separated by whitespace. The order of the items is immaterial.  A
       date string may contain many flavors of items:

       calendar date items
               Can  be specified several ways. Month names can only be three-letter english abbreviations, numbers can
               be zero-prefixed and the year may use 2 or 4 digits.  Examples: 06 Nov 1994, 06-Nov-94 and Nov-94 6.

       time of the day items
               This string specifies the time on a given day. You must specify it  with  6  digits  with  two  colons:
               HH:MM:SS.  To  not  include the time in a date string, will make the function assume 00:00:00. Example:
               18:19:21.

       time zone items
               Specifies international time zone. There are a few  acronyms  supported,  but  in  general  you  should
               instead use the specific relative time compared to UTC. Supported formats include: -1200, MST, +0100.

       day of the week items
               Specifies  a  day  of  the week. Days of the week may be spelled out in full (using english): 'Sunday',
               'Monday', etc or they may be abbreviated to their first three letters. This is usually  not  info  that
               adds anything.

       pure numbers
               If a decimal number of the form YYYYMMDD appears, then YYYY is read as the year, MM as the month number
               and DD as the day of the month, for the specified calendar date.


EXAMPLES
       Sun, 06 Nov 1994 08:49:37 GMT
       Sunday, 06-Nov-94 08:49:37 GMT
       Sun Nov  6 08:49:37 1994
       06 Nov 1994 08:49:37 GMT
       06-Nov-94 08:49:37 GMT
       Nov  6 08:49:37 1994
       06 Nov 1994 08:49:37
       06-Nov-94 08:49:37
       1994 Nov 6 08:49:37
       GMT 08:49:37 06-Nov-94 Sunday
       94 6 Nov 08:49:37
       1994 Nov 6
       06-Nov-94
       Sun Nov 6 94
       1994.Nov.6
       Sun/Nov/6/94/GMT
       Sun, 06 Nov 1994 08:49:37 CET
       06 Nov 1994 08:49:37 EST
       Sun, 12 Sep 2004 15:05:58 -0700
       Sat, 11 Sep 2004 21:32:11 +0200
       20040912 15:05:58 -0700
       20040911 +0200

STANDARDS
       This parser was written to handle date formats specified in RFC 822 (including the update in  RFC  1123)  using
       time zone name or time zone delta and RFC 850 (obsoleted by RFC 1036) and ANSI C's asctime() format. These for-
       mats are the only ones RFC2616 says HTTP applications may use.

RETURN VALUE
       This function returns -1 when it fails to parse the date string. Otherwise it returns the number of seconds  as
       described.

       If the year is larger than 2037 on systems with 32 bit time_t, this function will return 0x7fffffff (since that
       is the largest possible signed 32 bit number).

       Having a 64 bit time_t is not a guarantee that dates beyond 03:14:07 UTC, January 19, 2038 will work  fine.  On
       systems with a 64 bit time_t but with a crippled mktime(), curl_getdate will return -1 in this case.

REWRITE
       The  former  version  of this function was built with yacc and was not only very large, it was also never quite
       understood and it wasn't possible to build with non-GNU tools since only GNU Bison could make it thread-safe!

       The rewrite was done for 7.12.2. The new one is much smaller and uses simpler code.



libcurl 7.0                       12 Aug 2005                  curl_getdate(3)