zdump - time zone dumper
zdump [ --version ] [ -v ] [ -c [loyear,]hiyear ] [ zonename ... ]
Zdump prints the current time in each zonename named on the command
These 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.
Cut off the verbose output near the start of the given year(s).
The output still includes the lowest possible time value and one
day after it, and the highest possible time value preceded by
the time value one day before it.