The terms am and pm are used to describe before noon and afternoon respectively. However, the exact midday or noon, i.e., 12 falls in none of the categories. Even ’12 m’ was suggested in order to overcome this controversy. The same problem is associated with 12 at night. Although it was concluded to use 12 am for midnight and 12 pm for noon, 12 noon and 12 midnight are still accepted as a more convenient method of telling time during these two periods.