Maybe I'm missing something, but the one thing I want from DateTime is the ability to determine whether a day has elapsed since a file modify date, but not just a calendar day... at least a business day (i.e. Saturdays and Sundays don't count), but even better if a calendar could skip past government and/or business holidays too, so elapsed days are only the meaningful ones, weekends and business holidays would not increment a business days elapsed counter.
For example, if you have downloaded daily closing stock prices at 8PM on Friday the 29th of January, there's no point in downloading them again until after the close of trading Monday, February 1st, but if you originally downloaded them at 2PM on Friday the 29th of January, you will get one more result by downloading them again at 8PM that same day. It gets even more interesting when you throw time zone into the mix. The markets are still actively trading at 6:30 PM Pacific Time. Need DateTime functions that will aid in making those decisions. Is this being considered for Julia and if not, should it be?
