How do I add the number of years to a date and then minus away 3 months
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I'm added in the number of clawback years and I want it to send me an email 3 months before the clawback date. Everything works fine when I add in the $legal_fee_clawback_year. but after minus away 3 mths I get a wrong date 1-10-1969.

    $clawback_reminder = $loan_lo_year.'-'.$loan_lo_month.'-'.$loan_lo_day;
    $clawback_reminder=strtotime(date("y-m-d", strtotime($clawback_reminder)) . " +".$legal_fee_clawback_year." year"); 
    $clawback_reminder=strtotime(date("y-m-d", strtotime($clawback_reminder)) . " -3 month");  
    $clawback_reminder=date('j-n-Y', $clawback_reminder); 