curl_getdate.3
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- ." You can view this file with:
- ." nroff -man [file]
- ." $Id: curl_getdate.3,v 1.10 2008-12-28 21:56:56 bagder Exp $
- ."
- .TH curl_getdate 3 "12 Aug 2005" "libcurl 7.0" "libcurl Manual"
- .SH NAME
- curl_getdate - Convert a date string to number of seconds since January 1,
- 1970
- .SH SYNOPSIS
- .B #include <curl/curl.h>
- .sp
- .BI "time_t curl_getdate(char *" datestring ", time_t *"now " );"
- .ad
- .SH DESCRIPTION
- This function returns the number of seconds since January 1st 1970 in the UTC
- time zone, for the date and time that the fIdatestringfP parameter
- specifies. The fInowfP parameter is not used, pass a NULL there.
- fBNOTE:fP 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.
- .SH 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:
- .TP 0.8i
- .B 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.
- .TP
- .B 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.
- .TP
- .B 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.
- .TP
- .B 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.
- .TP
- .B 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.
- .PP
- .SH EXAMPLES
- .nf
- 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
- .fi
- .SH 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 formats are the
- only ones RFC2616 says HTTP applications may use.
- .SH 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(), fIcurl_getdatefP will return -1 in this case.
- .SH 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.
English
