export const getBirthMonth: (cnp: string) => number | undefined = (cnp) => {
  switch (cnp.slice(3, 5)) {
    case '01':
      return 0
    case '02':
      return 1
    case '03':
      return 2
    case '04':
      return 3
    case '05':
      return 4
    case '06':
      return 5
    case '07':
      return 6
    case '08':
      return 7
    case '09':
      return 8
    case '10':
      return 9
    case '11':
      return 10
    case '12':
      return 11
  }
}