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...;,"%m-%d-%Y-%H:%M",1,0) My second questions refers to finding the time difference in seconds between the first time a user sees something Vs the last.. and engagment time essentially, i see there is the difftime function, is there a more elegant way of working this out then my thoughts (Pysdo code below) sort data by user_id and Timestamp take the head of user_id as new_time_var take the tail of user_id as new_time_var2 use difftime(new_time_var, new_time_var2, units="secs") Mike [[alternative HTML version deleted]]