zdump prints the current time in each
zonename named on the command line.
These options are available:
- Cut off verbose output near the start of the given year(s). By default,
the program cuts off verbose output near the start of the years -500 and
- 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.
-v option may not be used on systems with
time_t values that are neither float
Time discontinuities are found by sampling the results returned by
localtime at twelve-hour intervals. This works in all real-world cases;