On Linux (well, glibc, not sure about other libc implementations) you can just set the `TZ` environment variable before running the app. I wonder if Windows has something similar.
You might be able to obtain reproducible behavior from a tool that insists on putting time stamps into its output, and has no options for reproducibility.
You might be able to get an indefinite extension for running some time-limited trialware.
But not all, the author says: I get many email messages that say something like "I tried to extend the trial period of xyz software with RunAsDate and it didn't work". Running a software with different date/time can be used for many legitimate purposes and for these purposes RunAsDate was created. I have never said implicitly or explicitly that RunAsDate can be used for extending the trial period of a software. For some shareware programs, RunAsDate might really work, but many shareware creators are smart enough to detect that the date/time was modified and when they detect the time change, they end the trial period immediately.
Please don't bother yourself to send me a question about extending the trial period of a software, because these kind of messages are simply deleted without answering.
It's a niche statistical analytics programming language. Used by banks and pharmaceutical companies mostly because it makes it easier to audit things. The open source alternative would be R.
