Also called military time. A 24-hour period in the toll-free application is measured from 0000 to 2359, or midnight to 11:59 PM. To convert to military time, add 12 to the number that appears on the clock after 12:00 PM [noon]. For example, 1:00 PM is 12 plus 1 [the clock number], which equals 13 or 1300 hours.
A toll-free telephone number.