Command Section
ZDUMP(8)                FreeBSD System Manager's Manual               ZDUMP(8)

     zdump - timezone dumper

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

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

     The following options are available:

             Output version information and exit.

     -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 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 isdst=1 if the given
             time is Daylight Saving Time or isdst=0 otherwise.

     -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 starts of
             the years -500 and 2500.

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

     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.

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

FreeBSD 11.1-RELEASE-p4          June 20, 2004         FreeBSD 11.1-RELEASE-p4
Command Section