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1. ordinalDateValid :: OrdinalDate -> Maybe Day

   thyme	Data.Thyme.Calendar.OrdinalDate

   Convert an OrdinalDate to a Day, or Nothing for invalid input.

   > ordinalDateValid (OrdinalDate 2015 365)
   Just 2015-12-31
   
   > ordinalDateValid (OrdinalDate 2015 366)
   Nothing
   
   > ordinalDateValid (OrdinalDate 2016 366)
   Just 2016-12-31
   

2. fromWeekDateValid :: Year -> WeekOfYear -> DayOfWeek -> Maybe Day

   thyme	Data.Thyme.Calendar.WeekDate

   Converts an ISO week date to a Day. Returns Nothing for invalid input.

   fromWeekDateValid y w d = weekDateValid (WeekDate y w d)
   

3. mondayWeekValid :: MondayWeek -> Maybe Day

   thyme	Data.Thyme.Calendar.WeekDate

   Convert a MondayWeek to a Day, or Nothing for invalid MondayWeek.

4. sundayWeekValid :: SundayWeek -> Maybe Day

   thyme	Data.Thyme.Calendar.WeekDate

   Convert a SundayWeek to a Day, or Nothing for invalid SundayWeek.

5. weekDateValid :: WeekDate -> Maybe Day

   thyme	Data.Thyme.Calendar.WeekDate

   Convert a WeekDate to a Day, or Nothing for invalid WeekDate.

6. weekdayOfMonthValid :: WeekdayOfMonth -> Maybe Day

   thyme	Data.Thyme.Calendar.WeekdayOfMonth

   Convert a WeekdayOfMonth to a Day. Returns Nothing for invalid input. For example, the third Sunday of January 2016 is 2016-01-27, but there is no fifth Monday in January 2016.

   > weekdayOfMonthValid (WeekdayOfMonth 2016 1 3 7)
   Just 2016-01-17
   > weekdayOfMonthValid (WeekdayOfMonth 2016 1 5 1)
   Nothing
   

7. makeTimeOfDayValid :: Hour -> Minute -> DiffTime -> Maybe TimeOfDay

   thyme	Data.Thyme.LocalTime

   Construct a TimeOfDay from the hour, minute, and second. Returns Nothing if these constraints are not satisfied:

   • 0 ≤ hour ≤ 23
   • 0 ≤ minute ≤ 59
   • 0 ≤ second < minuteLength hour minute

8. midday :: TimeOfDay

   thyme	Data.Thyme.LocalTime

   Hour twelve, noon.

   midday = TimeOfDay 12 0 zeroV
   

9. midnight :: TimeOfDay

   thyme	Data.Thyme.LocalTime

   Hour zero, midnight.

   midnight = TimeOfDay 0 0 zeroV
   

10. isValidLocalTime :: TimeZoneSeries -> LocalTime -> Bool

    timezone-series	Data.Time.LocalTime.TimeZone.Series

    When a clock change moves the clock forward, local times that are between the wall clock time before the change and the wall clock time after the change cannot occur.

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