20 lines
510 B
Haskell
20 lines
510 B
Haskell
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module Timestamp where
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isPreviewSeason :: Timestamp -> Bool
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isPreviewSeason (Ts x _ _) = x >= 20
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inFuture :: Timestamp -> Timestamp -> Bool
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inFuture (Ts d1 m1 y1) (Ts d2 m2 y2)
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| y1 /= y2 = y1 > y2
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| m1 /= m2 = m1 > m2
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| d1 /= d2 = d1 > d2
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| otherwise = False
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monthsSince :: Timestamp -> Timestamp -> Integer
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monthsSince (Ts d1 m1 y1) (Ts d2 m2 y2)
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| t1 `inFuture` t2 = (12 * (y1 - y2)) + (m1 - m2)
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| otherwise = 0
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where
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t1 = Ts d1 m1 y1
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t2 = Ts d2 m2 y2
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