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Adjust ( $Date, $DeltaYears, $DeltaMonths, $DeltaDays );

Adjust ( $Date, 0, 0, 15 );  # or
Adjust ( $Date, 0, -1, 0 );  # or
Adjust ( $Date, -3, 0, -1 );

Adjust ( { date => $Date, day => 15 } );  # or
Adjust ( { date => $Date, month => -1 } );  # or
Adjust ( { date => $Date, year => -3, day => -1 } );

sub Adjust
{
...

  #  More code ..
}