81 lines
3.4 KiB
Groff
81 lines
3.4 KiB
Groff
.\" You can view this file with:
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.\" nroff -man [file]
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.\" $Id$
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.\"
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.TH curl_getdate 3 "5 March 2001" "libcurl 7.0" "libcurl Manual"
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.SH NAME
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curl_getdate - Convert an date in a ASCII string to number of seconds since
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January 1, 1970
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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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This function returns the number of seconds since January 1st 1970, for the
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date and time that the
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.I datestring
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parameter specifies. The
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.I now
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parameter is there and should hold the current time to allow the datestring to
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specify relative dates/times. Read further in the date string parser section
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below.
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.SH PARSING DATES AND TIMES
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A "date" is a string, possibly empty, containing many items separated by
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whitespace. The whitespace may be omitted when no ambiguity arises. The
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empty string means the beginning of today (i.e., midnight). Order of the
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items is immaterial. A date string may contain many flavors of items:
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.TP 0.8i
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.B calendar date items
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This can be specified in a number of different ways. Including 1970-09-17, 70-9-17, 70-09-17, 9/17/72, 24 September 1972, 24 Sept 72, 24 Sep 72, Sep 24, 1972, 24-sep-72, 24sep72.
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The year can also be omitted, for example: 9/17 or "sep 17".
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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. Syntax supported includes:
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18:19:0, 18:19, 6:19pm, 18:19-0500 (for specifying the time zone as well).
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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 realtive 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. If this is mentioned alone it means that day of
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the week in the future.
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Days of the week may be spelled out in full: `Sunday', `Monday', etc or they
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may be abbreviated to their first three letters, optionally followed by a
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period. The special abbreviations `Tues' for `Tuesday', `Wednes' for
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`Wednesday' and `Thur' or `Thurs' for `Thursday' are also allowed.
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A number may precede a day of the week item to move forward supplementary
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weeks. It is best used in expression like `third monday'. In this context,
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`last DAY' or `next DAY' is also acceptable; they move one week before or
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after the day that DAY by itself would represent.
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.TP
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.B relative items
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A relative item adjusts a date (or the current date if none) forward or
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backward. Example syntax includes: "1 year", "1 year ago", "2 days", "4
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weeks".
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The string `tomorrow' is worth one day in the future (equivalent to `day'),
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the string `yesterday' is worth one day in the past (equivalent to `day ago').
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.TP
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.B pure numbers
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If the decimal number is of the form YYYYMMDD and no other calendar date item
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appears before it in the date string, then YYYY is read as the year, MM as the
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month number and DD as the day of the month, for the specified calendar date.
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.PP
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.SH RETURN VALUE
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This function returns zero when it fails to parse the date string. Otherwise
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it returns the number of seconds as described.
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.SH AUTHORS
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Originally written by Steven M. Bellovin <smb@research.att.com> while at the
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University of North Carolina at Chapel Hill. Later tweaked by a couple of
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people on Usenet. Completely overhauled by Rich $alz <rsalz@bbn.com> and Jim
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Berets <jberets@bbn.com> in August, 1990.
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.SH "SEE ALSO"
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.BR
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.SH BUGS
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Surely there are some, you tell me!
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