Problem with Time based Workflow

 Hi,

I have one requirement, there is a field called Reminder time, where user will set some time , if the system time reaces that reminder time an automated task should be created. For this requirement i created a time based workflow where i set condition "[<dt Remainder_Time_ITAG>] IS NOT N ULL " and in Wait Action i specified [<dt Remainder_Time_ITAG>]  in Until when option. It was working fine the problem was if user modifies something and the current time is more than the reminder time also task was getting created so i added one more condition "PRE('<d