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1c39128d97
Make curl_getdate() handle dates before 1970 as well (returning negative values). Make test 517 test dates for 64 bit time_t. This fixes bug (3) mentioned in #2238 Closes #2250
111 lines
4.3 KiB
Groff
111 lines
4.3 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.haxx.se/docs/copyright.html.
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" *
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.\" **************************************************************************
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.TH curl_getdate 3 "12 Aug 2005" "libcurl 7.0" "libcurl Manual"
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.SH NAME
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curl_getdate - Convert a date string to number of seconds
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.SH SYNOPSIS
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.B #include <curl/curl.h>
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.sp
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.BI "time_t curl_getdate(char *" datestring ", time_t *"now " );"
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.ad
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.SH DESCRIPTION
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\fIcurl_getdate(3)\fP returns the number of seconds since the Epoch, January
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1st 1970 00:00:00 in the UTC time zone, for the date and time that the
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\fIdatestring\fP parameter specifies. The \fInow\fP parameter is not used,
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pass a NULL there.
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.SH PARSING DATES AND TIMES
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A "date" is a string containing several items separated by whitespace. The
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order of the items is immaterial. A date string may contain many flavors of
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items:
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.TP 0.8i
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.B calendar date items
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Can be specified several ways. Month names can only be three-letter english
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abbreviations, numbers can be zero-prefixed and the year may use 2 or 4 digits.
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Examples: 06 Nov 1994, 06-Nov-94 and Nov-94 6.
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.TP
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.B time of the day items
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This string specifies the time on a given day. You must specify it with 6
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digits with two colons: HH:MM:SS. To not include the time in a date string,
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will make the function assume 00:00:00. Example: 18:19:21.
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.TP
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.B time zone items
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Specifies international time zone. There are a few acronyms supported, but in
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general you should instead use the specific relative time compared to
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UTC. Supported formats include: -1200, MST, +0100.
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.TP
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.B day of the week items
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Specifies a day of the week. Days of the week may be spelled out in full
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(using english): `Sunday', `Monday', etc or they may be abbreviated to their
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first three letters. This is usually not info that adds anything.
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.TP
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.B pure numbers
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If a decimal number of the form YYYYMMDD appears, then YYYY is read as the
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year, MM as the month number and DD as the day of the month, for the specified
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calendar date.
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.PP
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.SH EXAMPLES
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.nf
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Sun, 06 Nov 1994 08:49:37 GMT
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Sunday, 06-Nov-94 08:49:37 GMT
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Sun Nov 6 08:49:37 1994
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06 Nov 1994 08:49:37 GMT
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06-Nov-94 08:49:37 GMT
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Nov 6 08:49:37 1994
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06 Nov 1994 08:49:37
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06-Nov-94 08:49:37
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1994 Nov 6 08:49:37
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GMT 08:49:37 06-Nov-94 Sunday
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94 6 Nov 08:49:37
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1994 Nov 6
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06-Nov-94
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Sun Nov 6 94
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1994.Nov.6
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Sun/Nov/6/94/GMT
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Sun, 06 Nov 1994 08:49:37 CET
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06 Nov 1994 08:49:37 EST
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Sun, 12 Sep 2004 15:05:58 -0700
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Sat, 11 Sep 2004 21:32:11 +0200
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20040912 15:05:58 -0700
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20040911 +0200
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.fi
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.SH STANDARDS
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This parser was written to handle date formats specified in RFC 822 (including
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the update in RFC 1123) using time zone name or time zone delta and RFC 850
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(obsoleted by RFC 1036) and ANSI C's asctime() format. These formats are the
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only ones RFC 7231 says HTTP applications may use.
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.SH RETURN VALUE
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This function returns -1 when it fails to parse the date string. Otherwise it
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returns the number of seconds as described.
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On systems with a signed 32 bit time_t: if the year is larger than 2037 or
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less than 1903, this function will return -1.
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On systems with an unsigned 32 bit time_t: if the year is larger than 2106 or
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less than 1970, this function will return -1.
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On systems with 64 bit time_t: if the year is less than 1583, this function
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will return -1. (The Gregorian calendar was first introduced 1582 so no "real"
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dates in this way of doing dates existed before then.)
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.SH "SEE ALSO"
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.BR curl_easy_escape "(3), " curl_easy_unescape "(3), "
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.BR CURLOPT_TIMECONDITION "(3), " CURLOPT_TIMEVALUE "(3) "
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