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


       #include <curl/curl.h>

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


       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.


       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.


       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
       Sun Nov 6 94
       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


       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 formats are the only ones RFC2616 says HTTP  applications
       may use.


       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.


       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

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