>>>>>SNIP ..
>My client doesn't want that. I have had this contract for 4 weeks and have been on site 9 times. The file server has NEVER had both the correct date and time when I've been on site. The department I have the contract with has a PC with a UPS and the date/time is always correct. The interdepartment relations is such that if accounting says anything about the date/time being wrong, they lose access to the network. Not my way of working but it's their's. As long as my invoices are paid on time, I'll charge them to write programs that do what their system whould do automatically.

I hate when that happens (gives us IS Managers a bad name). FWIW, both hardware - and software-based time servers are available (if the customer is willing to spend the money) and should solve the problem nicely.