Thats simple. When you insert an auction into the database the user will be able to specific the end date (I assume) so when you insert the record you will have a field that contains the date the auction was posted (lets call it begin date) and you will have a field that determines when the auction ends (call it end date)
For the countdown part this can be done through SQL
SELECT DateDiff(beginDate, getDate()) From <table> where auctionID = <value>
You could then, either in SQL or .NET code, write logic to determine if the auction is over e.g. if getDate() >= endDate then the auction is over.
hth
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How to Create a countdown timer
