date time difference x++

public static void DateTimeDifference(Args _args)
{     
TransDateTime   dateTime_a, dateTime_b;
date            date1, date2;
int64           c;
#define.NoOfHrsInADay(24);
dateTime_a= 2018-09-26T11:59:59;
dateTime_b= 2018-09-19T08:50:50;
c = DateTimeUtil::getDifference(dateTime_a,dateTime_b);
date1 = DateTimeUtil::date(dateTime_a);
date2 = DateTimeUtil::date(dateTime_b);
c = c - (date1-date2)*(#NoOfHrsInADay)*60*60;
info(strFmt("%1 day, %2 hrs.",(date1-date2), c div 3600));
}