Preview the date in the Set Date module

[CreepPork]

Is your feature request related to a problem?
When zeusing, I don't want to switch the time multiple times because I can't set it right. So to relieve the flashiness a preview button would be nice.

Solution you'd like:

• Open the Set Date module dialog
• Press Preview
• Move the slider
• See changes reflected locally
  • If the user presses Cancel, then they get a beep and a message telling them that they cancelled it
  • If they press OK, then the time is set for the server.

Alternatives you've considered:
N/A

Additional context:
Like the module in Achilles (worked only on dedi and I would assume the same here)