Hi guys,
All ways suggested worked fine ... the for this is that the downtime is calculated from the time the the information is sent to the output table, but the data will be sent out only when downtime occurs and this clock will be perfect. As each record is set in the output table it is stamped by the subform which is grabbing the time date etc.... each time it has data entered.
Thanks for all the input, you guys are an invaluable resource for the beginner Access programmer.
Thanks again.