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.\"
.\" Copyright (c) 2016 - 2023 Masato Minda
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd Jul 17, 2023
.Dt TZDIFF 1
.Os
.Sh NAME
.Nm tzdiff
.Nd displays timezone differences with localtime.
.Sh SYNOPSIS
.Nm
.Op Fl 0lvHN
.Op Fl n Ar count
.Op Fl f Ar format
.Op Fl t Ar start
timzone
.Op timezone ...
.Op count
.Op 0
.Sh DESCRIPTION
The
.Nm
utility displays the localtime of the designated timezone and yours.
.Pp
The
.Nm
utility needs at least one of timezone name, such as
.Dq Asia/Tokyo .
If the argument is
.Dq Asia
then
.Nm
displays the timezones of Asia. You can easy to choose it from the result.
.Pp
The
.Nm
supports the complition with name of timezone for useful.
For example,
.Dq Tok
means
.Dq Asia/Tokyo .
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl h
Show usage.
.It Fl 0
Round down to hour. 0(zero) may be specified as the last argument.
.It Fl l
Display full timezone name (region/city), only city in default.
.It Fl n Ar count
Number of hours. Default is 10. It may be specified as the last argument.
.It Fl f Ar format
Output format of time. It uses output format of
.Xr date 1
.It Fl t Ar start
Specify the start time.
For the GNU date command, you can specify a flexible format.
Otherwise, it supports one of "YYYY-mm-ddTHH:HH[Z]", "YYYYmmddTHHMM[Z]" or "YYYYmmddHHMM[Z]", adding "Z" means UTC.
.It Fl v
Show version of tzdiff.
.It Fl H
Scripting mode with timezone name. In scripting mode, field separator is TAB instead of space.
.It Fl HH
Scripting mode without timezone name.
.It Fl N
Display without local timezone.
.El
.Sh EXAMPLES
These exsamples are in JST.
.Pp
The command:
.Pp
.Dl tzdiff
.Pp
will display the result of
.Dq "ls -F /usr/share/zoneinfo" :
.Bd -literal -offset indent
Africa/ Australia/ Etc/ MST WET
America/ CET Europe/ MST7MDT posixrules
--- snip --- snip --- snip ---
Asia/ EST Indian/ SystemV/
Atlantic/ EST5EDT MET UTC
.Ed
.Pp
The command:
.Pp
.Dl "tzdiff Eu"
.Pp
will display the result of
.Dq "ls -F /usr/share/zoneinfo/Europe" :
.Bd -literal -offset indent
Europe/Amsterdam Europe/Kiev Europe/Sarajevo
Europe/Andorra Europe/Kirov Europe/Saratov
--- snip --- snip --- snip ---
Europe/Jersey Europe/Samara
Europe/Kaliningrad Europe/San_Marino
.Ed
.Pp
The command:
.Pp
.Dl "tzdiff Europe/Amsterdam"
.Pp
will display the time of CET and localtime.:
.Pp
.Bd -literal -offset indent
Amsterdam
2018-12-19 14:52 CET 2018-12-19 22:52 JST
2018-12-19 15:52 CET 2018-12-19 23:52 JST
--- snip --- snip --- snip ---
2018-12-19 22:52 CET 2018-12-20 06:52 JST
2018-12-19 23:52 CET 2018-12-20 07:52 JST
.Ed
.Pp
The command:
.Pp
.Dl "tzdiff Lond New_ 0 3"
.Pp
will display:
.Bd -literal -offset indent
London New_York
2018-12-20 01:00 GMT 2018-12-19 20:00 EST 2018-12-20 10:00 JST
2018-12-20 02:00 GMT 2018-12-19 21:00 EST 2018-12-20 11:00 JST
2018-12-20 03:00 GMT 2018-12-19 22:00 EST 2018-12-20 12:00 JST
.Ed
.Sh SEE ALSO
.Xr date 1 ,
.Xr strftime 3 ,
.Xr strptime 3
.Pp
.Nm
on Github: https://github.com/belgianbeer/tzdiff
.Sh AUTHOR
Written by
.An Masato Minda
|
