Adds an API for work with deltatime things.
deltatime.get([<unit>])
Gets deltatime float value. If unit param is nothing, returns seconds. If unit param is something like seconds / minutes / hours, it will returns seconds (same as nothing) / minutes / hours.
deltatime.add(<sec>, <min>, <hour>)
Adds time in deltatime.
For example, you want to add 15 seconds in deltatime, you can make it through: deltatime.add(15, 0, 0)