UpdateManager

If you need access to passed game time you can use UpdateManager.

All that you need is create an object with update() function and add it to updateManager:

local object = {}

function object:update(dt)
    -- use dt (delta time from previous frame)
end

fv.core.theUpdateManager:addObject(object)

However, the better programming practice is to create a special class for this (see Classes for details):

MyClass = Class("MyClass")

function MyClass:update(dt)
    -- use dt (delta time from previous frame)
end

local instance = MyClass()
fv.core.theUpdateManager:addObject(instance)

By default, dt is represented game time (in seconds). That is, dt is scaled by time control buttons and always 0 on pause. If you need real delta time for some reason, you need pass true for second parameter of addObject() function:

fv.core.theUpdateManager:addObject(instance, true)