Hledger.Data.Period

periodAsDateSpan

dateSpanAsPeriod

simplifyPeriod

isLastDayOfMonth

isStandardPeriod

showPeriod

periodStart

periodEnd

periodNext

periodPrevious

periodNextIn

periodPreviousIn

periodMoveTo

periodGrow

periodShrink

mondayBefore

yearMonthContainingWeekStarting

quarterContainingMonth

firstMonthOfQuarter

startOfFirstWeekInMonth