My real time script runs in Studio but not in the Client?

So I found a script which is GMT time as far as I know. If its BST then even better. It works in studio, syncs up to my clock. Run it in Player. Nothing happens. Run it in Studio, works perfectly. Just day time when you run it in the Player.

local time_zone = -5        -- Time zone, offset from GMT.

local tz_diff = 5*3600 + time_zone*3600
local secondsInDay = 60*60*24

while true do
    game.Lighting:setMinutesAfterMidnight(math.fmod(tick() + tz_diff,secondsInDay)/60)
    wait(0.1)
end