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.\"
.IX Title "CONVDATE 1"
.TH CONVDATE 1 "2008-04-06" "INN 2.4.5" "InterNetNews Documentation"
.SH "NAME"
convdate \- Convert time/date strings and numbers
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fBconvdate\fR [\fB\-dhl\fR] [\fB\-c\fR | \fB\-n\fR | \fB\-s\fR] [\fIdate\fR ...]
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBconvdate\fR translates the date/time strings given on the command line,
outputting the results one to a line.  The input can either be a date in
some format that \fIparsedate\fR\|(3) can parse or the number of seconds since
epoch (if \fB\-c\fR is given).  The output is either \fIctime\fR\|(3) results, the
number of seconds since epoch, or a Usenet Date: header, depending on the
options given.
.SH "OPTIONS"
.IX Header "OPTIONS"
.IP "\fB\-c\fR" 4
.IX Item "-c"
Each argument is taken to be the number of seconds since epoch (a time_t)
rather than a date.
.IP "\fB\-d\fR" 4
.IX Item "-d"
Output a valid Usenet Date: header instead of the results of \fIctime\fR\|(3) for
each date given on the command line.  This is useful for testing the
algorithm used to generate Date: headers for local posts.  Normally, the
date will be in \s-1UTC\s0, but see the \fB\-l\fR option.
.IP "\fB\-h\fR" 4
.IX Item "-h"
Print usage information and exit.
.IP "\fB\-l\fR" 4
.IX Item "-l"
Only makes sense in combination with \fB\-d\fR.  If given, Date: headers
generated will use the local time zone instead of \s-1UTC\s0.
.IP "\fB\-n\fR" 4
.IX Item "-n"
Rather than outputting the results of \fIctime\fR\|(3) or a Date: header, output
each date given as the number of seconds since epoch (a time_t).  This
option doesn't make sense in combination with \fB\-d\fR.
.IP "\fB\-s\fR" 4
.IX Item "-s"
Pass each given date to \fIparsedate\fR\|(3) and print the results of \fIctime\fR\|(3) (or
a Date: header if \fB\-d\fR is given).  This is the default behavior.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
Note that relative times or times with partial information use the current
time to fill in the rest of the date, so dates like \*(L"12pm\*(R" are taken to be
12pm of the day when convdate is run.  This is a property of \fIparsedate\fR\|(3);
see the man page for more information.  Most of these examples are from
the original man page dating from 1991 and were run in the \-0400 time
zone.
.PP
.Vb 2
\&    % convdate 'feb 10 10am'
\&    Sun Feb 10 10:00:00 1991
.Ve
.PP
.Vb 3
\&    % convdate 12pm 5/4/90
\&    Fri Dec 13 00:00:00 1991
\&    Fri May  4 00:00:00 1990
.Ve
.PP
Note that 12pm and 5/4/90 are two *separate* arguments and therefore
result in two results.  Note also that a date with no time is taken to be
at midnight.
.PP
.Vb 3
\&    % convdate \-n 'feb 10 10am' '12pm 5/4/90'
\&    666198000
\&    641880000
.Ve
.PP
.Vb 2
\&    % convdate \-c 666198000
\&    Sun Feb 10 10:00:00 1991
.Ve
.PP
\&\fIctime\fR\|(3) results are in the local time zone.  Compare to:
.PP
.Vb 2
\&    % convdate \-dc 666198000
\&    Sun, 10 Feb 1991 15:00:00 +0000 (UTC)
.Ve
.PP
.Vb 2
\&    % env TZ=PST8PDT convdate \-dlc 666198000
\&    Sun, 10 Feb 1991 07:00:00 \-0800 (PST)
.Ve
.PP
.Vb 2
\&    % env TZ=EST5EDT convdate \-dlc 666198000
\&    Sun, 10 Feb 1991 10:00:00 \-0500 (EST)
.Ve
.PP
The system library functions generally use the environment variable \s-1TZ\s0 to
determine (or at least override) the local time zone.
.SH "HISTORY"
.IX Header "HISTORY"
Written by Rich \f(CW$alz\fR <rsalz@uunet.uu.net>, rewritten and updated by Russ
Allbery <rra@stanford.edu> for the \fB\-d\fR and \fB\-l\fR flags.
.PP
$Id: convdate.1 7880 2008-06-16 20:37:13Z iulius $
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIparsedate\fR\|(3).