Checking for condition of given date with current system date in workflow

Hi,

I have created a table which has a column name DateOfAction, in that column user can insert the date whenever he wants to run a task. Now, I have created a workflow which will call the task reading it from SQL. I want to check that if DateOf Action matches the system date then only the task should run. Is there any sql query or workflow component which will check for the condition that given date is equal to system date,if it matches then only proceed for further execution or else end the workflow..

Thanks.