CHALLENGE CALCULATED COLUMN

Hi FrankWoody 

Try this DAX expression to add your new calculated column:

New Column = 
VAR _Len =
    LEN ( 'Table'[DATE] )
VAR _Dash_No =
    _Len - LEN ( SUBSTITUTE ( 'Table'[DATE], "-", "" ) )
VAR _C =
    IF ( LEFT ( RIGHT ( 'Table'[DATE], 4 ), 1 ) = "-", 4, 3 )
VAR _K =
    IF ( _Dash_No > 2, RIGHT ( 'Table'[DATE], _Len - 2 ), 'Table'[DATE] )
VAR _Re =
    IF ( _Dash_No > 2, LEFT ( _K, LEN ( _K ) - _C ), LEFT ( 'Table'[DATE], 4 ) )
RETURN
    _Re

Output:

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