pdd - 1.5-1 main

pdd (python3 date diff) is a small cmdline utility to calculate date and
time difference. If no program arguments are specified it shows the current
date, time and timezone.
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Feature
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- calculate date difference
- calculate time difference
- calculate diff from today and now
- add, subtract duration (timeslice) to/from date (time)
- show current date, time and timezone
- minimal dependencies