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. zonename should be the relative path file name from /usr/share/zoneinfo/
which directory contains all zone data.
Cut off the verbose output near the start of the given year.