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The *clock* special variable and the following generic functions are exposed so that applications may re-define the current time or date as required. This can be used for testing or to support alternate clocks.
The currently supported values are:
t
- Use the standard system clock with no adjustments
leap-second-adjusted
- The system clock, adjusted for leap seconds using the information in *default-timezone*.
Specialize this generic function to re-define the present moment
Specialize this generic function to re-define the present day