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What day of the week was 0030-04-07?

GROUPS:

Today I asked WolframAlpha "What day of the week was 0030-04-07?", and he answered "Sunday." However, timeanddate.com said it was Friday. So who is right? I just need to know. Thanks.

timeanddate.com's result

POSTED BY: Andrew Chou
Answer
9 months ago

There might be a problem with either site because the calendar that we use now didn't exist back then. So there were no leap years back than. If the algorithm keeps doing leap-year checks all the way back to 0030, it will probably not work...

POSTED BY: Sander Huisman
Answer
9 months ago

I quote:

The first leap year in the modern sense in Britain was 1752, when 11 days were 'lost' from the month September with the adoption of the Gregorian calendar by Britain and her colonies.

So i'm not sure what happened in those lost 11 days. Did it just continue with the days or were also the days skipped?

POSTED BY: Sander Huisman
Answer
9 months ago
calendarType = {"Gregorian", "Islamic", "Jewish", "Julian"};
day = DateList[{30, 4, 7}];
Map[{#, DayName[Take[day, 3], CalendarType -> #]} &, 
  calendarType] // TableForm**strong text**
(* "Gregorian"  Sunday
"Islamic"   Monday
"Jewish"    Thursday
"Julian"    Friday

*)
POSTED BY: Michael Helmle
Answer
9 months ago

Group Abstract Group Abstract