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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  function-ality functionality
       ality  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 usu-ally usually
               ally 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 asc-time() asctime()
       time() format. These formats 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)