Hello, First I wanted to thank everyone on this list for all their input, it helps newbs like me tremendously. I was hoping that someone could help me. I just don''t understand how to come up with runt temporal expressions. I am trying to generate a rule/expression that accounts for the following infomation. Rule 1: recurring event every n days with a specific start and end date Rule 2: recurring event every n days with a specific start date and no end date. Thanks for any help, again I just can''t comprehend how to do this.