Use a 24-hour clock
Start with 0000 for midnight
Add hours from 0001 to 1159 for morning times
Use 1200 for noon
Add 12 to PM hours after 1200
Write 1300 for 1:00 PM
Write 1400 for 2:00 PM
Write 1500 for 3:00 PM
Write 1600 for 4:00 PM
Write 1700 for 5:00 PM
Write 1800 for 6:00 PM
Write 1900 for 7:00 PM
Write 2000 for 8:00 PM
Write 2100 for 9:00 PM
Write 2200 for 10:00 PM
Write 2300 for 11:00 PM
Write minutes after the hour as two digits
Write 1345 for 1:45 PM
Write 0815 for 8:15 AM
Omit the colon in standard military format
Use four digits for most times
Keep leading zeros for morning times
Use 2400 only when specifically allowed for midnight at day’s end