faketime

Fake the system time for a given command.

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• Fake the time to this evening, before printing the result of date:

faketime '{today 23:30}' {date}

• Open a new bash shell, which uses yesterday as the current date:

faketime '{yesterday}' {bash}

• Simulate how a program would act next Friday night:

faketime '{next Friday 1 am}' {path/to/program}

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