If you need more precision than in 30-minute intervals, then add one digit for each additional 15 minutes.
For example, 10 30 would be 8 o’clock in the morning. If it’s AM/PM, then it’s the same as normal. If you are trying to convert to or from military time, there is a simple formula that you can use based on what type of time it is: For example, if it’s a Monday at 10:30 AM, it would be 10 30. They also use 24-hour days just like we do but they use two digits per hour.
It is helpful to know that all military bases, including those overseas, observe the standard United States calendar with 12 AM and 12 PM occurring 59 minutes apart. Since 13 is greater than 12, subtract 12 which gives you 1 (13-12=1) so you have 1:00 PM.
For example, if you see 1300 as the time, the hours are 13 and the minutes are 00. The easiest way to convert a time from military time is to subtract 12 from any hour that is greater than 12 and add PM to the end. If a time only has three digits, then the first one is the hour (e.g., 100) and the last two digits are the minutes. The first two digits are the hours and the last two digits are the minutes. Military times are written with four digits (e.g., 0100 which is 1:00 AM). How to Quickly Convert From Military Time