Applying an interval format( "l Y-m-d\n" ); $i = DateInterval::createFromDateString( "next weekday" ); echo $d->add( $i )->format( "l Y-m-d\n" ); $i = DateInterval::createFromDateString( "3 months 10 days" ); echo $d->sub( $i )->format( "l Y-m-d\n" ); ?>]]> Result: Friday 2018-04-20 Monday 2018-04-23 Wednesday 2018-01-10