zdump - Time zone dumper
/usr/ucb/zdump [-c cutoffyear] [-v] zonename...
Cuts off the verbose output near the start of the cutoffyear.
-v For each zonename on the command line, prints the current time, 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 time at which the rules for computing local time
change, the time at the highest possible time value, and the time at
one day less than the highest possible time value. Each line ends with
isdst=1 if the given time is Daylight Saving Time or isdst=0 otherwise.
The zdump command prints the current time in each zonename named on the
Standard zone information directory