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.IX Title "CONVDATE 1"
.TH CONVDATE 1 2024-04-01 "INN 2.7.2" "InterNetNews Documentation"
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.SH NAME
convdate \- Convert to/from RFC 5322 dates and seconds since epoch
.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
RFC\ 5322 format (accepting the variations on that format that innd(8) is
willing to accept), or the number of seconds since epoch (if \fB\-c\fR is
given).  The output is either ctime(3) results, the number of seconds
since epoch, or a Usenet Date header field body, depending on the options
given.
.PP
If \fIdate\fR is not given, \fBconvdate\fR outputs the current date.
.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 field body instead of the results of
ctime(3) for each date given on the command line.  This is useful for
testing the algorithm used to generate Date header field bodies for local
posts.  Normally, the date will be in UTC, 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 header
field bodies generated will use the local time zone instead of UTC.
.IP \fB\-n\fR 4
.IX Item "-n"
Rather than outputting the results of ctime(3) or a Date header field
body, 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 the RFC\ 5322 date parser and print the results of
ctime(3) (or a Date header field body if \fB\-d\fR is given).  This is the default
behavior.
.SH EXAMPLES
.IX Header "EXAMPLES"
Most of these examples are taken, with modifications from the original manual
page dating from 1991 and were run in the EST/EDT time zone.
.PP
.Vb 2
\&    % convdate \*(Aq10 Feb 1991 10:00:00 \-0500\*(Aq
\&    Sun Feb 10 10:00:00 1991
\&
\&    % convdate \*(Aq13 Dec 91 12:00 EST\*(Aq \*(Aq04 May 1990 0:0:0\*(Aq
\&    Fri Dec 13 12:00:00 1991
\&    Fri May  4 00:00:00 1990
\&
\&    % convdate \-n \*(Aq10 feb 1991 10:00\*(Aq \*(Aq4 May 90 12:00\*(Aq
\&    666198000
\&    641880000
\&
\&    % convdate \-c 666198000
\&    Sun Feb 10 10:00:00 1991
.Ve
.PP
ctime(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)
\&
\&    % env TZ=America/Los_Angeles convdate \-dlc 666198000
\&    Sun, 10 Feb 1991 07:00:00 \-0800 (PST)
\&
\&    % env TZ=America/New_York convdate \-dlc 666198000
\&    Sun, 10 Feb 1991 10:00:00 \-0500 (EST)
.Ve
.PP
The system library functions generally use the environment variable TZ to
determine (or at least override) the local time zone.
.SH HISTORY
.IX Header "HISTORY"
Written by Rich $alz <rsalz@uunet.uu.net>, rewritten and updated by Russ
Allbery <eagle@eyrie.org> for the \fB\-d\fR and \fB\-l\fR flags.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
active.times(5).