TimeOfDay detecting part of script not working?

local light = script.Parent
local timeofday = game.Lighting.TimeOfDay

while true do
    wait(1)
    if timeofday > "17:45:00" and timeofday < "06:20:00" then
        print("its night")
        light.Angle = 180
        light.Brightness = 10
        light.Range = 12
    else
        print("its day")
        light.Angle = 0
        light.Brightness = 0
        light.Range = 0
    end
end

The output keeps on printing that it's day..

I don't get how to fix it. is it because of comparing with strings instead of numbers? And if it is, how would i convert time of day to numbers? It doesn't let me write the time of day as a number without an error.