TODO list for Perl module DateTime - what's the relation between UT1 and MJD/JD ? see: http://hpiers.obspm.fr/eop-pc/earthor/utc/leapsecond.html * strftime method - more tests for other languages * sub-second resolution - more tests: add/subtract/compare * Other - document RD days/seconds(/nanosecs?) in a separate document that will be the reference for DateTime.pm internals, as well as being useful for other calendar implementors. - thorough tests for subtraction & addition overloading NOTE TO FUTURE DEVELOPERS: Attempting to implement add_duration in XS actually seemed to slow date math operations down. Sad but true.