    -- #hide
    module Data.Time.Calendar.Private where

    import Data.Fixed

    data PadOption = Pad Int Char | NoPad

    showPadded :: PadOption -> String -> String
    showPadded NoPad s = s
    showPadded (Pad i c) s = replicate (i - length s) c ++ s

    showPaddedNum :: (Num t,Ord t,Show t) => PadOption -> t -> String
    showPaddedNum NoPad i = show i
    showPaddedNum pad i | i < 0 = '-':(showPaddedNum pad (negate i))
    showPaddedNum pad i = showPadded pad $ show i

    show2Fixed :: Pico -> String
    show2Fixed x | x < 10 = '0':(showFixed True x)
    show2Fixed x = showFixed True x

    show2 :: (Num t,Ord t,Show t) => t -> String
    show2 = showPaddedNum $ Pad 2 '0'

    show3 :: (Num t,Ord t,Show t) => t -> String
    show3 = showPaddedNum $ Pad 3 '0'

    show4 :: (Num t,Ord t,Show t) => t -> String
    show4 = showPaddedNum $ Pad 4 '0'

    mod100 :: (Integral i) => i -> i
    mod100 x = mod x 100

    div100 :: (Integral i) => i -> i
    div100 x = div x 100

    clip :: (Ord t) => t -> t -> t -> t
    clip a _ x | x < a = a
    clip _ b x | x > b = b
    clip _ _ x = x

    clipValid :: (Ord t) => t -> t -> t -> Maybe t
    clipValid a _ x | x < a = Nothing
    clipValid _ b x | x > b = Nothing
    clipValid _ _ x = Just x