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.\"
.IX Title "CONVDATE 1"
.TH CONVDATE 1 "2016-10-07" "INN 2.6.4" "InterNetNews Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.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
\&\s-1RFC\s0\ 5322 format (accepting the variations on that format that \fBinnd\fR\|(8) is
willing to accept), or the number of seconds since epoch (if \fB\-c\fR is
given).  The output is either \fBctime\fR\|(3) results, the number of seconds
since epoch, or a Usenet Date: header, 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 instead of the results of \fBctime\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 \fBctime\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 the \s-1RFC\s0\ 5322 date parser and print the results of
\&\fBctime\fR\|(3) (or a Date: header 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 man
page dating from 1991 and were run in the \s-1EST/EDT\s0 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
\&\fBctime\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)
\&
\&    % env TZ=PST8PDT convdate \-dlc 666198000
\&    Sun, 10 Feb 1991 07:00:00 \-0800 (PST)
\&
\&    % 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$alz\fR <rsalz@uunet.uu.net>, rewritten and updated by Russ
Allbery <eagle@eyrie.org> for the \fB\-d\fR and \fB\-l\fR flags.
.PP
\&\f(CW$Id:\fR convdate.pod 9971 2015\-12\-10 20:30:10Z iulius $
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBactive.times\fR\|(5).