You can get the seconds by using Modulo. In code you would use the % sign.
float seconds = GameTimeInSeconds % 60; // 60 because there are 60 seconds in a minute
The way it works is it will remove 60 (or whatever you use) from GameTimeInSeconds until there’s less then 60 left. It will then return whatever is left. In this case you remove one minute at a time until there’s less then a minute left, and the result is the remaining seconds.
You get the minutes by dividing by 60 and flooring the value.
You get the hours by dividing by (6060) which is 3600, and flooring the value.
You can get days by dividing by (6060*24) and flooring the value.