A system and method for time virtualization, comprising a time virtualizer running on a first digital computer and adapted to intercept time-dependent requests from a plurality of applications executing on the first or another digital computer, wherein on intercepting a time-dependent request from an application, the time virtualizer returns an expected result to the requesting application comprising a virtual time rather than a clock time, the virtualized time being established by the time virtualizer and differing from the clock time, is disclosed.