zdump - time zone dumper
zdump [ -v ] [ -c cutoffyear ] [ zonename ... ]
Zdump prints the current time in each zonename named on the command line.
These options are available:
-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.
newctime(3), tzfile(5), zic(8).