Duration Between

Compute elapsed seconds between two fixed timestamps.

duration_between.lua

local hours = 
local startTime = 1717200000
local finishTime = startTime + hours * 60 * 60
local seconds = os.difftime(finishTime, startTime)
print("hours=" .. hours)
print("seconds=" .. seconds)

local hours = 
local startTime = 1717200000
local finishTime = startTime + hours * 60 * 60
local seconds = os.difftime(finishTime, startTime)
print("hours=" .. hours)
print("seconds=" .. seconds)

local hours = 
local startTime = 1717200000
local finishTime = startTime + hours * 60 * 60
local seconds = os.difftime(finishTime, startTime)
print("hours=" .. hours)
print("seconds=" .. seconds)

elapsed seconds `os.difftime` returns a numeric difference, which is safe to replay as a scalar.