patch applied (packages/time): add validating converters

[Ashley Yakeley]

Mon Jun  1 23:51:42 PDT 2009  Ashley Yakeley <ashley at semantic.org>
  * add validating converters
  Ignore-this: 4b18a44adbcb288e62f8dbce1377be8b

    M ./Data/Time/Calendar/Gregorian.hs -1 +8
    M ./Data/Time/Calendar/Julian.hs -1 +8
    M ./Data/Time/Calendar/JulianYearDay.hs +10
    M ./Data/Time/Calendar/MonthDay.hs -1 +13
    M ./Data/Time/Calendar/OrdinalDate.hs +10
    M ./Data/Time/Calendar/Private.hs +5
    M ./Data/Time/Calendar/WeekDate.hs +14
    M ./test/ConvertBack.hs -6 +11

View patch online:
http://darcs.haskell.org/packages/time/_darcs/patches/20090602065142-ac6dd-8e4090d57516369e58f07fbf5872fadd5b30db9c.gz