Add preliminary, untested parsing.
Merge branch 'master' of git+ssh://git.eigenstate.org/git/ori/libdate
Add 'tozone' converter for dates.
Fix formatting timezones and years.
Add time formatting support.
Convert back from date to Unix time.
Add format variants that just do ymd.
Add support for default formats.
Add preliminary support for time zones.
Remove a few magic constants.
Keep the actual time and offset.