freebsd-skq/usr.sbin/zic/zdump.8
Edwin Groothuis dfc79e892f 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

62 lines
1.4 KiB
Groff

.\"
.\" @(#)zdump.8 7.3
.\" $FreeBSD$
.\"
.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