Determination of the legal validity of competing wills follows the principle that a later will takes precedence over an earlier one. And "later" and "earlier" are determined by the dates written on each will.
因此遺囑效力的認定是採取「後立遺囑推翻前立遺囑」的原則，而「前」、「後」順序的認定概以遺囑上的年月日為準。