Extracted from Pike v7.8 release 866 at 2016-11-06.
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Calendar
Calendar.TimeRange

Methods
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 subtract()
 succeeds()
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previousCalendar.TimeRange()->strictly_succeeds()
Calendar.TimeRange()->succeeds()next

Method Calendar.TimeRange()->subtract()

Method subtract

TimeRange subtract(TimeRange what)

Description

This subtracts a period of time from another; 

>- the past          the future -<
|-------called-------|
     |-------other--------|
<---->  <- called->subtract(other)
 
|-------called-------|
     |---third---|
<---->           <---> <- called->subtract(third)