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 ----------------------------------------------------------------