Days between dates: Difference between revisions
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Or, composing rather than raising errors: |
Or, composing rather than raising errors: |
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<lang haskell> |
<lang haskell>import Data.Time (Day) |
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import Data.Time (Day) |
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import Data.Time.Calendar (diffDays) |
import Data.Time.Calendar (diffDays) |
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import Data.Time.Format (defaultTimeLocale, parseTimeM) |
import Data.Time.Format (defaultTimeLocale, parseTimeM) |
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showDateDiff s1 s2 = |
showDateDiff s1 s2 = |
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maybe |
maybe |
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( |
(unlines ["Unparseable as date string pair:", s1, s2]) |
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["Unparseable as date string pair:", s1, s2] |
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) |
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( \n -> |
( \n -> |
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concat |
concat |
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["There are ", |
[ "There are ", |
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show n, |
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" days between ", |
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s1, |
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" and ", |
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s2, |
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"." |
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] |
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) |
) |
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$ daysBetween s1 s2</lang> |
$ daysBetween s1 s2</lang> |
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