freebsd-dev/usr.sbin/zic/zdump.8

.\"
.\"	@(#)zdump.8	8.2
.\" This file is in the public domain, so clarified as of
.\" 2009-05-17 by Arthur David Olson.
.\" $FreeBSD$
.\"
.Dd June 20, 2004
.Dt ZDUMP 8
.Os
.Sh NAME
.Nm zdump
.Nd timezone dumper
.Sh SYNOPSIS
.Nm
.Op Fl -version
.Op Fl v
.Op Fl c Ar [loyear,]hiyear
.Op Ar zonename ...
.Sh DESCRIPTION
The
.Nm
utility prints the current time in each
.Ar zonename
named on the command line.
.Pp
The following options are available:
.Bl -tag -width indent
.It Fl -version
Output version information and exit.
.It Fl v
For each
.Ar zonename
on the command line,
print the time at the lowest possible time value,
the time one day after the lowest possible time value,
the times both one second before and exactly at
each detected time discontinuity,
the time at one day less than the highest possible time value,
and the time at the highest possible time value,
Each line ends with
.Em isdst=1
if the given time is Daylight Saving Time or
.Em isdst=0
otherwise.
.It Fl c Ar loyear,hiyear
Cut off verbose output near the start of the given year(s).
By default,
the program cuts off verbose output near the starts of the years -500 and 2500.
.El
.Sh LIMITATIONS
The
.Fl v
option may not be used on systems with floating-point time_t values
that are neither float nor double.
.Pp
Time discontinuities are found by sampling the results returned by localtime
at twelve-hour intervals.
This works in all real-world cases;
one can construct artificial time zones for which this fails.
.Sh "SEE ALSO"
.Xr ctime 3 ,
.Xr tzfile 5 ,
.Xr zic 8
Convert to mdoc. 1998-02-04 07:30:11 +00:00			`.\"`
MFV of tzcode2009h revision r192887 - Clarify the license for the tzcode: public domain MFC after: 1 month 2009-05-27 12:18:39 +00:00			`.\" @(#)zdump.8 8.2`
			`.\" This file is in the public domain, so clarified as of`
			`.\" 2009-05-17 by Arthur David Olson.`
$Id$ -> $FreeBSD$ 1999-08-28 01:35:59 +00:00			`.\" $FreeBSD$`
Convert to mdoc. 1998-02-04 07:30:11 +00:00			`.\"`
Merge changes from the tzcode2004a import. 2004-06-20 21:41:11 +00:00			`.Dd June 20, 2004`
Convert to mdoc. 1998-02-04 07:30:11 +00:00			`.Dt ZDUMP 8`
			`.Os`
			`.Sh NAME`
			`.Nm zdump`
			`.Nd timezone dumper`
			`.Sh SYNOPSIS`
mdoc(7) police: use the new features of the Nm macro. 2000-11-20 20:10:44 +00:00			`.Nm`
Merge changes from the tzcode2004a import. 2004-06-20 21:41:11 +00:00			`.Op Fl -version`
Convert to mdoc. 1998-02-04 07:30:11 +00:00			`.Op Fl v`
MFV of tzcode2009e: Upgrade of the tzcode from 2004a to 2009e. Changes are numerous, but include... - New format of the output of zic, which supports both 32 and 64 bit time_t formats. - zdump on 64 bit platforms will actually produce some output instead of doing nothing for a looooooooong time. - linux_base-fX, with X >= at least 8, will work without problems related to the local time again. The original patch, based on the 2008e, has been running for a long time on both my laptop and desktop machine and have been tested by other people. After the installation of this code and the running of zic(8), you need to run tzsetup(8) again to install the new datafile. Approved by: wollman@ for usr.sbin/zic MFC after: 1 month 2009-05-23 06:31:50 +00:00			`.Op Fl c Ar [loyear,]hiyear`
Convert to mdoc. 1998-02-04 07:30:11 +00:00			`.Op Ar zonename ...`
			`.Sh DESCRIPTION`
The .Nm utility 2002-07-14 14:47:15 +00:00			`The`
			`.Nm`
			`utility prints the current time in each`
Convert to mdoc. 1998-02-04 07:30:11 +00:00			`.Ar zonename`
The latest and greatest timezone code from Arthur David Olson, part 1. This import comprises the `zic' and `zdump' programs. Obtained from: Arthur David Olson, ftp://elsie.nci.nih.gov/pub/tzcode94g 1994-09-13 03:29:24 +00:00			`named on the command line.`
Convert to mdoc. 1998-02-04 07:30:11 +00:00			`.Pp`
			`The following options are available:`
			`.Bl -tag -width indent`
Merge changes from the tzcode2004a import. 2004-06-20 21:41:11 +00:00			`.It Fl -version`
			`Output version information and exit.`
Convert to mdoc. 1998-02-04 07:30:11 +00:00			`.It Fl v`
The latest and greatest timezone code from Arthur David Olson, part 1. This import comprises the `zic' and `zdump' programs. Obtained from: Arthur David Olson, ftp://elsie.nci.nih.gov/pub/tzcode94g 1994-09-13 03:29:24 +00:00			`For each`
Convert to mdoc. 1998-02-04 07:30:11 +00:00			`.Ar zonename`
The latest and greatest timezone code from Arthur David Olson, part 1. This import comprises the `zic' and `zdump' programs. Obtained from: Arthur David Olson, ftp://elsie.nci.nih.gov/pub/tzcode94g 1994-09-13 03:29:24 +00:00			`on the command line,`
Merge from vendor branch. We are now completely up-to-date with respect to the ADO timezone code. 1996-07-18 19:59:09 +00:00			`print the time at the lowest possible time value,`
The latest and greatest timezone code from Arthur David Olson, part 1. This import comprises the `zic' and `zdump' programs. Obtained from: Arthur David Olson, ftp://elsie.nci.nih.gov/pub/tzcode94g 1994-09-13 03:29:24 +00:00			`the time one day after the lowest possible time value,`
			`the times both one second before and exactly at`
			`each detected time discontinuity,`
			`the time at one day less than the highest possible time value,`
			`and the time at the highest possible time value,`
			`Each line ends with`
Convert to mdoc. 1998-02-04 07:30:11 +00:00			`.Em isdst=1`
The latest and greatest timezone code from Arthur David Olson, part 1. This import comprises the `zic' and `zdump' programs. Obtained from: Arthur David Olson, ftp://elsie.nci.nih.gov/pub/tzcode94g 1994-09-13 03:29:24 +00:00			`if the given time is Daylight Saving Time or`
Convert to mdoc. 1998-02-04 07:30:11 +00:00			`.Em isdst=0`
The latest and greatest timezone code from Arthur David Olson, part 1. This import comprises the `zic' and `zdump' programs. Obtained from: Arthur David Olson, ftp://elsie.nci.nih.gov/pub/tzcode94g 1994-09-13 03:29:24 +00:00			`otherwise.`
MFV of tzcode2009e: Upgrade of the tzcode from 2004a to 2009e. Changes are numerous, but include... - New format of the output of zic, which supports both 32 and 64 bit time_t formats. - zdump on 64 bit platforms will actually produce some output instead of doing nothing for a looooooooong time. - linux_base-fX, with X >= at least 8, will work without problems related to the local time again. The original patch, based on the 2008e, has been running for a long time on both my laptop and desktop machine and have been tested by other people. After the installation of this code and the running of zic(8), you need to run tzsetup(8) again to install the new datafile. Approved by: wollman@ for usr.sbin/zic MFC after: 1 month 2009-05-23 06:31:50 +00:00			`.It Fl c Ar loyear,hiyear`
			`Cut off verbose output near the start of the given year(s).`
			`By default,`
			`the program cuts off verbose output near the starts of the years -500 and 2500.`
Spelling. Add missing .El. 2000-01-23 20:36:27 +00:00			`.El`
MFV of tzcode2009e: Upgrade of the tzcode from 2004a to 2009e. Changes are numerous, but include... - New format of the output of zic, which supports both 32 and 64 bit time_t formats. - zdump on 64 bit platforms will actually produce some output instead of doing nothing for a looooooooong time. - linux_base-fX, with X >= at least 8, will work without problems related to the local time again. The original patch, based on the 2008e, has been running for a long time on both my laptop and desktop machine and have been tested by other people. After the installation of this code and the running of zic(8), you need to run tzsetup(8) again to install the new datafile. Approved by: wollman@ for usr.sbin/zic MFC after: 1 month 2009-05-23 06:31:50 +00:00			`.Sh LIMITATIONS`
			`The`
			`.Fl v`
			`option may not be used on systems with floating-point time_t values`
			`that are neither float nor double.`
			`.Pp`
			`Time discontinuities are found by sampling the results returned by localtime`
			`at twelve-hour intervals.`
			`This works in all real-world cases;`
			`one can construct artificial time zones for which this fails.`
Convert to mdoc. 1998-02-04 07:30:11 +00:00			`.Sh "SEE ALSO"`
			`.Xr ctime 3 ,`
			`.Xr tzfile 5 ,`
			`.Xr zic 8`