AH, yes - thanks, that is the missing 13-days mystery? And yes - in us MM/dd/yy is most common. Thanks. Dr. Gregory Guthrie Maharishi International University ---------------------------------------------------------------- Subject: Re: [Haskell-cafe] dates... Dear Gregory, According to [1]:
For any given event during the years from 1901 to 2099 inclusive, its date according to the Julian calendar is 13 days behind its corresponding Gregorian date.
Regards, Jeroen Bransen [1] https://en.wikipedia.org/wiki/Julian_calendar Op 6-8-2020 om 05:23 schreef Gregory Guthrie: I don't understand why the Julian conversion are given relative to 2019, instead of 2020, and don't seem to actually show the date index. Must be misreading the library specs? toJulianYearAndDay :: Dayhttps://hackage.haskell.org/package/time-1.6/docs/Data-Time-Calendar.html#t:... -> (Integerhttps://hackage.haskell.org/package/base-4.8.1.0/docs/Prelude.html#t:Integer, Inthttps://hackage.haskell.org/package/base-4.8.1.0/docs/Data-Int.html#t:Int) convert to proleptic Julian year and day format. First element of result is year (proleptic Julian calendar), second is the day of the year, with 1 for Jan 1, and 365 toJulian :: Dayhttps://hackage.haskell.org/package/time-1.6/docs/Data-Time-Calendar.html#t:... -> (Integerhttps://hackage.haskell.org/package/base-4.8.1.0/docs/Prelude.html#t:Integer, Inthttps://hackage.haskell.org/package/base-4.8.1.0/docs/Data-Int.html#t:Int, Inthttps://hackage.haskell.org/package/base-4.8.1.0/docs/Data-Int.html#t:Int) Sourcehttps://hackage.haskell.org/package/time-1.6/docs/src/Data-Time-Calendar-Jul... convert to proleptic Julian calendar. First element of result is year, second month number (1-12), third day (1-31). ---------------------------------------------------------------------------------- ds = "1/8/2020" day = parseTimeOrError True defaultTimeLocale "%-m/%-d/%Y" ds :: UTCTime getDay = toGregorian . utctDay getDayOfYear = toJulian . utctDay getDayYear = toJulianYearAndDay. utctDay main = do print day print $ getDay day print $ getDayYear day print $ getDayOfYear day 2020-01-08 00:00:00 UTC (2020,1,8) (2019,360) (2019,12,26) And; 2020-02-08 00:00:00 UTC (2020,2,8) (2020,26) (2020,1,26) Dr. Gregory Guthrie Maharishi International University ---------------------------------------------------------------- _______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post. -- Jeroen Bransen Lead Back-end Developer at Chordify [https://chordify.net/img/email-signature.png]https://chordify.net/