zdump - Time zone dumper
/usr/ucb/zdump [ -c cutoffyear ] [ -v ] zonename ...
Cuts off the verbose output near the start of the cutoffyear. 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 command line.
Standard zone information directory
Files: tzfile(4) delim off