Data.Time.Patterns
type DatePattern
day
mondayWeek
sundayWeek
month
year
january
february
march
april
may
june
july
august
september
october
november
december
monday
tuesday
wednesday
thursday
friday
saturday
sunday
never
every
shiftBy
inEach
take
skip
except
intersect
union
until
elementOf
instancesFrom
intervalsFrom