12 = noon = midday (middag)
 AM =  0(:01) - 11(:59) = before (före)  12
*PM = 12(:01) - 23(:59) = after  (efter) 12
*PM (= post meridiem) = AM + 12
*PM   = 12 13 14 15 16 17 18 19 20 21 22 23
 AM      0  1  2  3  4  5  6  7  8  9 10 11
 Minut. 00 05 10 15 20 25 30 35 40 45 50 55