Small function to verify validity of datetime (to use with https://gist.github.com/thomo/8ac2bceb6400eb8868c651e8897be958)

isDateTimeValid.lua

function isDateTimeValid(second, minute, hour, day, month, year)
  function check(x, xmin, xmax) 
    return x >= xmin and x <= xmax
  end
  
  return check(second, 0, 59) and check(minute, 0, 59) and check(hour, 0, 23) and 
         check(day, 1, 31) and check(month, 1, 12) and check(year, 0, 99)
end