How do you update text on a Text Label in the screen GUI without resetting the character?

I am building a game that needs a schedule, and I wrote a script that I thought would work, but didn't. I then asked for help on this forum, and was given some, but the script given to me as a solution didn't work either for updating the text.

Here is the script (its a script in serverscriptservice:

local lighting = game:GetService("Lighting")
local tim = lighting.ClockTime


function changeText(current, nexts)
    for i,v in pairs(game.Players:GetPlayers()) do
        v.PlayerGui.Schedule.viewschedule.current.Text = current
        v.PlayerGui.Schedule.viewschedule.next.Text = nexts
    end
end

if tim >= 6 then
    changeText("Wake Up", "Math Class")
end

if tim >= 8 then
    changeText("Math Class", "Break Time") -- So basically you do changeText(current text, next text)
end

if tim >= 10 then
    changeText("Break Time", "Lunch Time")
end

if tim >= 12 then
    changeText("Lunchtime", "Reading")
end

if tim >= 14 then
    changeText("Reading", "Science")
end

if tim >= 16 then
    changeText("Science", "Dinner")
end

if tim >= 18 then
    changeText("Dinner", "Freetime")
end

if tim >= 20 then
    changeText("Freetime", "Bedtime")
end

if tim >= 22 then
    changeText("Bedtime", "Wake Up")
end

So my question is how do you update the text for everyone on the server without resetting your player?