You could transform the seconds to hours and minutes
function convertToHMS(Seconds)
local Minutes = (Seconds - Seconds%60)/60
Seconds = Seconds - Minutes*60
local Hours = (Minutes - Minutes%60)/60
Minutes = Minutes - Hours*60
return ("%02i"):format(Hours)..":"..("%02i"):format(Minutes)..":"..("%02i"):format(Seconds)
end
local Now = os.time()
local W = 1637099166
warn(Now)
print(os.date("%c", Now))
warn(W)
print(os.date("%c", W))
local C = Now - W
warn(C)
print(convertToHMS(C))