Dates are signaled by two, four, or six numerals preceded by the letter D. The first two numerals indicate the day of the month; when used alone, they refer to the current month.
Example: D15—Transmitted on the 15th of the current month. The two numerals that follow indicate the month of the year.
Example: D1504 means 15 April. Where necessary, the year may be indicated by two further numerals.
Example: 181096 means 18 October 1996.
Times are to be expressed in four figures, of which the first two denote the hour (from 00—midnight up to 23—11 p.m.), and the last two denote the minutes (from 00-59). The figures are preceded by
- The letter T, indicating local time, or
- The letter Z, indicating Greenwich mean time.
BH T1045 L2015N G3840W C125—I sighted an aircraft at local time 1045 in lat. 20°15’N long. 38°40’W flying on course 125°. RX Z0830—You should proceed at GMT 0830.