2. Converting Time Conventional 12-hour clock –Source of errors in medication administration –Each time occurs twice daily 10:00 a.m. 10:00 p.m.

3. Converting Time (cont.) 24 hour time – military time –Reduces chance for errors –Each time occurs only once per day 10:00 a.m. = 1000 10:00 p.m. = 2200

4. Converting Time (cont.) Rule 7-2 Rule 7-2 When using a 24 hour clock for time: 1.Write 00 as the first two digits This represents the first hour after midnight.

5. Converting Time (cont.) Rule 7-2 (cont.) 2.Write 01, 02, 03, … 09 as the first two digits This represents the hours 1:00 a.m. through 9:00 a.m.

6. Converting Time (cont.) Rule 7-2 (cont.) 3.Add 12 to the first two digits This represents the hours 12:00 p.m. through 11:00 p.m. so that 12, 13, …23 represent these hours. 4.Write midnight as either 2400 or 0000.

7. Practice 1. Convert 9:00 a.m. to 24 hour time. ANSWER: 0900 2. Convert 12:19 a.m. to 24 hour time. ANSWER: 0019 3. Convert 4:28 p.m. to 24 hour time. ANSWER: 1628

8. Practice 4.Convert 1139 to conventional time. ANSWER: 1139 = 11:39 a.m. 5.Convert 1515 to conventional time. ANSWER: 1515 = 3:15 p.m.

9. Converting Time Rule 3-10 Rule 3-10 To state the time using 24 hour time: 1.Say “zero” if the first digit is a zero. 2.Say “zero zero” if the first two digits are both zero.

10. Converting Time Rule 3-10 (cont.) 3.If the minutes are represented by 00, then say “hundred” after you say the hour. 00 = hundred

11. Practice State the time 0900.* State the time 1139.* State the time 0023.* *Click speaker buttons to hear answers.

12. Apply Your Knowledge Convert 5:58 p.m. to 24 hour time ANSWER: 1758 Convert 0031 to conventional time ANSWER: 12:31 a.m. Convert 1845 to conventional time ANSWER: 6:45 p.m. Convert 4:24 a.m. to 24 hour time ANSWER: 0424

13. Apply Your Knowledge Write out the time 0856 as you would say it. ANSWER: Zero eight fifty-six hours Write out the time 1435 as you would say it. ANSWER: Fourteen thirty-five hours