Zdump prints the current time in each
zonename named on the command line.
These options are available:
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
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.