You may also use =ISLEAPYEAR( &quot; 29/02/1968 &quot; ) or =ISLEAPYEAR( &quot; 29/02/68 &quot; ).
Vous pouvez aussi utiliser =ESTBISSEXTILE( &quot; 29-02-1968 &quot; ) ou =ESTBISSEXTILE( &quot; 29/02/1968 &quot; ).