mirror of
https://github.com/moparisthebest/curl
synced 2024-12-21 23:58:49 -05:00
101 lines
3.7 KiB
Groff
101 lines
3.7 KiB
Groff
.\" You can view this file with:
|
|
.\" nroff -man [file]
|
|
.\" $Id$
|
|
.\"
|
|
.TH curl_getdate 3 "12 Aug 2005" "libcurl 7.0" "libcurl Manual"
|
|
.SH NAME
|
|
curl_getdate - Convert an 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 \fIdatestring\fP parameter
|
|
specifies. The \fInow\fP 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
|
|
abbrivations, 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_getdate\fP 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 use simpler
|
|
code.
|