I am looking for a tool that allows us to override the system date-timestamp on the Unix servers so that we can perform regression tests using the same set of scripts and data. CDS is an example of a system where the logic is very date/time dependent. It would make regression testing much easier and more reliable if we could always start the tests at the same date/time. I recall back in the Y2K days there was a tool that allowed us to do that on the Unisys mainframe, but not sure about Unix.