libfaketime

Intercept and modify system time for testing time-dependent code

brewmacoslinux

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Report faked system time to programs

faketime

Run a program with a specific fake date$ faketime '2020-01-15 10:30:00' ./my_program

Test with relative time offset (1 month in the past)$ faketime '-1m' date

Run a script with accelerated time progression (2x speed)$ faketime -f '+2d x2' /path/to/script.sh