Lua determines whether the current time is the time of the day

function  isToday(timestamp)
    local today = os.date("*t")
    local secondOfToday = os.time({day=today.day, month=today.month,year=today.year, hour=0, minute=0, second=0})
    if timestamp >= secondOfToday and timestamp < secondOfToday + 24 * 60 * 60 then
        return true
    else
        return false
    end
end