Need help with a script please

I need to find customers with a last transaction date occurring before 1/1/2012 and update a custom field on the customer record. I've never used the getSummary function and need to know if the below java I have will work.

Thank you in advance!

 function UpdateWinback()   {  var filters = new Array();   filters[0] = new nlobjSearchFilter('winback', null, 'isEmpty', null);    filters[1] = new nlobjSearchFilter('date', null, 'Before','1/1/2012').getSummary(max); // Need to pull customers with a last transaction date before 1/1/2012   filters[2] = new nlobjSearchFilter('custentity_altslsrep', null, 'isNotEmpty', null);   filters[3] = new nlobjSearchFilter('custentity_transitiondate', null, 'onOrBefore', 'custentity_transitiondate');     var columns = new Array()   columns[0] = new nlobjSearchColumn('internalid');   columns[1] = new nlobjSearchColumn('entityid');    columns[2] = new nlobjSearchColumn('salesrep');   columns[3] = new nlobjSearchColumn('companyname');   columns[4] = new nlobjSearchColumn('firstorderdate');   columns[5] = new nlobjSearchColumn('custentity_transitiondate');   columns[6] = new nlobjSearchColumn('custentity_altslsrep');   columns[7] = new nlobjSearchColumn('date');   columns[8] = new nlobjSearchColumn('custentity_winback');    var results = nlapiSearchRecord( 'customer', null, filters, columns);        nlapiLogExecution('DEBUG', 'Records to