Time

Six Figure Date/Time Group.

• For aeronautical purposes, date/time groups are used to express time rather than the more conventional methods, such as 25th of August, March 15, 10.35 a.m.
• They can be in a 6, 8, or 10-figure date/time group, with the 6-figure group being the most common.
• In all instances, the largest time unit comes first, followed by each successive unit, thus years precede months, months precede days and so on.
• In the six-figure date and time group, the date is a two-figure group for the day of the month from 00 to 31.
• This is then followed by the time, written as a four-figure group on a 24-hour clock, the first two figures representing the hours from 00 to 24, and the last two figures representing the minutes from 00 through to 59.

Example

Express 10.35 a.m., 13 September as a six-figure date and time group.

The four-figure time group for 10.35 a.m. is 1035. 

The two-figure date group representing the day will be 13. 

Put the two groups together to get the six-figure group.

Answer: 131035

Example

Express 3.21 p.m. on 17 March, as a six-figure date and time group.

First, convert 3.21 p.m. to 24-hour time by adding 12 hours to express the four-figure time group which will make it 1521.