The title of your thread might need clarification.
First: a "mod" is a modification of the original game, typically adding something that normally doesn't exist and sometimes just changing things like weapon statistics or unlockables gained through progress of the game. Sometimes, adding content that was excluded by the developers but have assets that could be used.
Second: mods you find here on the forums are usually extracted directly to the game folder. Some of them require extra effort to get them to work with the game, like using third-party tools like "
Minimaul's SR2, SRTT, SRIV and GOoH Tools" found here on the forums.
However, there are some mods found here that are also found on Saints Row IV Workshop, in the Community section of Steam application. These mods from the latter might be easier for someone who hasn't been around modding. Simply, for most of the mods on Workshop, click the "subscribe" button located near the graphical representation area and start your game after it has downloaded (progress shown through Steam's application).
Are you looking for a mod to change what time of day, like you can from the Crib Ship? For this, find IdolNinja's "
Ship TOD controls unlock early" here on the forums.
Or do you want a mod that makes the progress of day to night visible in the game? For this, find IdolNinja's "
Dynamic Time of Day" at the Workshop.
Good luck, happy gaming!