ZDUMP(8)                OpenBSD System Manager's Manual               ZDUMP(8)

NAME
     zdump - time zone dumper

SYNOPSIS
     zdump [-v] [-c [loyear,]hiyear] zonename ...

DESCRIPTION
     zdump prints the current time in each zonename named on the command line.

     These options are available:

     -c [loyear,]hiyear
                 Cut off verbose output near the start of the given year(s).
                 By default, the program cuts off verbose output near the
                 start of the years -500 and 2500.

     -v          For each 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 ex-
                 actly 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
                 ``isdst=1'' if the given time is Daylight Saving Time or
                 ``isdst=0'' otherwise.

LIMITATIONS
     The -v option may not be used on systems with floating-point time_t val-
     ues that are neither float nor double.

     Time discontinuities are found by sampling the results returned by local-
     time at twelve-hour intervals.  This works in all real-world cases;

SEE ALSO
     ctime(3), tzfile(5), zic(8)

OpenBSD 4.7                      May 31, 2007                                1
