Method: When::TM::CalDate#prev

Defined in:

lib/when_exe/tmptypes.rb

#prev ⇒ When::TM::TemporalPosition

前の日時

Returns:

• (When::TM::TemporalPosition) —

  分解能に対応する Duration だけ,日時を戻す

# File 'lib/when_exe/tmptypes.rb', line 615

def prev
  @precision==When::DAY ? _force_euqal_day(-1) : self-period
rescue RangeError
  (When::Gregorian ^ self) - period
end