How to use TimeOfDay to change a NumberValue...? [SOLVED]

What I'm trying to achieve with this script is:

There's a NumberValue within each player in the game, I want the script to set it to 0 after TimeOfDay changes to 6:00:00 or more, but I only want it to change once that time has passed, and then leave it.

local players = game.Players:GetPlayers()
local currentTime = game.Lighting:GetMinutesAfterMidnight()/60

game.Lighting.Changed:connect(function(prop)
if prop == "TimeOfDay" then
    if currentTime >= 6 and currentTime < 20 then
        for i = 1, #players do
        players[i].Tiredv.Value = 0
        print'changed'
        end     end 

    else
    print'not time' 


    end
end)

After trying what @alphawolvess said,

I have this:

local players = game.Players:GetPlayers()
local currentTime = game.Lighting:GetMinutesAfterMidnight()/60

game.Lighting.Changed:connect(function()
    if game.Lighting.TimeOfDay == "06:00:00" then
        for i = 1, #players do
        players[i].Tiredv.Value = 0
        print'changed'
        end 

    else
    print'not time' 


    end
end)

And that still isn't working, I've tried 'game.Lighting.LightingChanged:connect(function()', and that also isn't working. Any ideas why this script might not be working as the script tells it to?

It prints 'not time', but when time == 06:00:00 it doesn't run the if statement... Hmm ;/