logic problem

I'm using some proprietary software/hardware where when a visitor swipes their entry card, it is recorded in a mssql 2000 server. My boss wants a count of unique vistors for a range of dates. So, I need to have it give a count of unique vistors, meaning that I need to count all vists for a day as one visit (because if they go outside to smoke and come back and swipe their card again to get in, each one is a separate visit, but i need to count all visits by each person as one visit since i just want to know if they came at all each day, not how many times they came in). This is my SQL statement: select distinct count(convert( varchar,eventime, 110)) as count, convert( varchar,eventime,110) as date from events, badge wher events.cardnum = badge.id and devid = '1' and convert( varchar, events.eventime, 110) BETWEEN '$startdate' and 'enddate' and type = '1' group by convert( varchar,events.eventime, 110) for reference, devid = '1' is the hardware device, where everytime it triggers, it means someone swiped their card to get in, and type = '1' means patron (because we have a type = 2 that is for staff and we jsut want to know how many patrons visited) When I execute this statement, its returning the result for each date of the total number of card swipes (so if a person comes in twice on a date, its recording it as 2 swipes, but I just need to know that they came to the building at all on this date, so I just need it to register that there was a count of atleast one for this card that was swiped) any suggestions? thanks