zdump man page
zdump — timezone dumper
zdump [--version] [--help] [-v] [-c [loyear,]hiyear] [zonename...]
The zdump program prints the current time in each zonename named on the command line.
Output version information and exit.
Output short usage message and exit.
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 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.
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tzfile(5), tzselect(8), zic(8).