HORIZON HASKELLDocslts/ghc-10.0.x2b276322026-10-31Search packagesCtrl K
Theme: |

GHC 10.0.0.20260917 · lts/ghc-10.0.x · 2b27632 · 2026-10-31

Moduletime-compat-1.9.9Haskell2010

Data.Time.Calendar.WeekDate.Compat

Contents
  1. ISO 8601 Week Date format
Synopsis
  • Packagetime-compat-1.9.9
  • Exports13
  • LanguageHaskell2010
  • LicenceBSD-3-Clause
  • SourceTypes.hs
typetype WeekOfYear = Int

Week of year, by various reckonings, generally in range 0-53 depending on reckoning.

datadata DayOfWeek
#
Instances14Enum, Eq, Data, Ord, Read, Show, …

ISO 8601 Week Date format

Convert to ISO 8601 Week Date format. First element of result is year, second week number (1-53), third day of week (1 for Monday to 7 for Sunday). Note that "Week" years are not quite the same as Gregorian years, as the first day of the year is always a Monday. The first week of a year is the first week to contain at least four days in the corresponding Gregorian year.

valuefromWeekDate :: Year -> WeekOfYear -> Int -> Day

Convert from ISO 8601 Week Date format. First argument is year, second week number (1-52 or 53), third day of week (1 for Monday to 7 for Sunday). Invalid week and day values will be clipped to the correct range.

Convert from ISO 8601 Week Date format. First argument is year, second week number (1-52 or 53), third day of week (1 for Monday to 7 for Sunday). Invalid week and day values will return Nothing.