Time Machine
Seasonal events. Forever.Lets you change what time the game thinks it is, which currently affects stuff like Halloween decorations, chance of the Mask and Tracker spawning, etc.
If the mod is installed correctly, an input field will appear in the bottom left corner of the main menu. You can input your desired date and/or time there. If you just want the highest possible chance for spooky stuff to happen do "3AM October 31" (which is also the default value).
Disables leaderboards if the mod affected anything during the run. If you disable the mod by making the input field empty or set a date which is functionally identical to the current one the leaderboards will not be affected. You can tell if your run had the leaderboards disabled by whether the leaderboard panel appears at the end screen.