1.\" $OpenBSD: zdump.8,v 1.3 2022/09/11 06:38:12 jmc Exp $ 2.Dd $Mdocdate: September 11 2022 $ 3.Dt ZDUMP 8 4.Os 5.Sh NAME 6.Nm zdump 7.Nd time zone dumper 8.Sh SYNOPSIS 9.Nm zdump 10.Op Fl v 11.Oo 12.Fl c 13.Oo Ar loyear , Oc Ar hiyear 14.Oc 15.Ar zonename ... 16.Sh DESCRIPTION 17.Nm 18prints the current time in each 19.Ar zonename 20named on the command line. 21.Pp 22These options are available: 23.Bl -tag -width Ds 24.It Xo 25.Fl c 26.Oo Ar loyear , Oc Ar hiyear 27.Xc 28Cut off verbose output near the start of the given year(s). 29By default, 30the program cuts off verbose output near the start of the years -500 and 2500. 31.It Fl v 32For each 33.Ar zonename 34on the command line, 35print the time at the lowest possible time value, 36the time one day after the lowest possible time value, 37the times both one second before and exactly at 38each detected time discontinuity, 39the time at one day less than the highest possible time value, 40and the time at the highest possible time value. 41Each line ends with 42.Dq isdst=1 43if the given time is Daylight Saving Time or 44.Dq isdst=0 45otherwise. 46.El 47.Sh LIMITATIONS 48The 49.Fl v 50option may not be used on systems with floating-point 51.Vt time_t 52values that are neither float nor double. 53.Pp 54Time discontinuities are found by sampling the results returned by localtime 55at twelve-hour intervals. 56This works in all real-world cases; 57.\" @(#)zdump.8 8.1 58.Sh SEE ALSO 59.Xr ctime 3 , 60.Xr tzfile 5 , 61.Xr zic 8 62.\" This file is in the public domain, so clarified as of 63.\" 2009-05-17 by Arthur David Olson. 64