Dolphin's pretty much coded to look at your system time, you'd have to somehow fool it by making it see a different system clock. It might be possible to do this from something like a Virtual Machine.
An easy way to change the system clock with minimal user input is to make a batch file in Windows using the time and date commands, then all you have to do is run the batch file by double clicking it. PowerShell might be a better option than the regular cmd.exe if you went this route.
An easy way to change the system clock with minimal user input is to make a batch file in Windows using the time and date commands, then all you have to do is run the batch file by double clicking it. PowerShell might be a better option than the regular cmd.exe if you went this route.