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of the sun. This is, however, a variable quantity which depends, among
other things, on where it is measured on earth. A mean value of this time,
based upon measurements in a number of places on the earth, is known
as Universal Time. A different time scale, based upon the definition of the
second, is known as International Atomic Time (TAI). A combination of
these two scales results in Co-ordinated Universal Time. This consists of
TAI adjusted as necessary by the use of leap seconds to obtain a close
approximation (always within 0.5 seconds) of Universal Time.
No. 14
22/11/84
ANNEX 5
ATTACHMENT E.-PRESENTATION OF DATE AND TIME
IN ALL-NUMERIC FORM
The International Organization for Standardization (ISO)
Standards 2014 and 3307 specify the procedures for writing
the date and time in all-numeric form and ICAO will be using
these procedures in its documents where appropriate in the
future.
2.-Presentation of Date
Where dates are presented in all-numeric form, IS0 2014
specifies that the sequence year-month-day should be used.
The elements of the date should be:
- four digits to represent the year, except that the century
digits may be omitted where no possible confusion
could arise from such an omission. There is value in
using the century digits during the period of familiarization
with the new format to make it clear that the new
order of elements is being used;
- two digits to represent the month;
- two digits to represent the day.
Where it is desired to separate the elements for easier visual
understanding, only a space or a hyphen should be used as a
separator. As an example, 25 August 1983 may be written as:
It should be emphasized that the IS0 sequence should only be
used where it is intended to use an all-numeric presentation.
Presentations using a combination of figures and words may
still be used if required (e.g. 25 August 1983).
3.1 Where the time of day is to be written in
all-numeric form, IS0 3307 specifies that the sequence hoursminutes-
seconds should be used.
3.2 Hours should be represented by two digits from
00 to 23 in the 24-hour timekeeping system and may be
followed either by decimal fractions of an hour or by minutes
and seconds. Where decimal fractions of an hour are used, the
normal decimal separator should be used followed by the
number of digits necessary to provide the required accuracy.
3.3 Minutes should likewise be represented by two
digits from 00 to 59 followed by either decimal fractions of a
minute or by seconds.
3.4 Seconds should also be represented by two digits
from 00 to 59 and followed by decimal fractions of a second
if required.
3.5 Where it is necessary to facilitate visual understanding
a colon should be used to separate hours and minutes
and minutes and seconds. For example, 20 minutes and
18 seconds past 3 o'clock in the afternoon may be written as:
152018 or 15:20:18 in hours, minutes and seconds
or 1520.3 or 15:20.3 in hours, minutes and decimal
fractions of a minute
or 15.338 in hours and decimal fractions of an hour.
4.-Combination Date and T i e Groups
This presentation lends itself to a uniform method of writing
date and time together where necessary. In such cases, the
sequence of elements year-month-day-hour-minute-second
should be used. It may be noted that not all the elements need
be used in every case - in a typical application, for example,
only the elements day-hour-minute might be used.
- END -
ANNEX 5 No. 14
22/11/84
COVER SHEET TO AMENDMENT 15
INTERNATIONAL STANDARDS
UNITS OF MEASUREMENT
TO BE USED IN
AIR AND GROUND OPERATIONS
ANNEX 5
TO THE CONVENTION ON INTERNATIONAL CIVIL AVIATION
FOURTH EDITION - JULY 1979
INTERNATIONAL CIVIL AVIATION ORGANIZATION
--.
Check-List of Amendments
t o Annex 5
D a t e o f
E f f e c t i v e Date A p p l i c a b i l i t y
Fourth E d i t i o n
( i n c o r p o r a t i n g Amendments 1-13)
Amendment 14 (adopted by Council on
27 February 1984)
Amendment 15 (adopted by Council on
24 November 1986)
Replacement pages 6, 7, 8, 1 1 , 1 2,
15, 16, 19 and 30
23 J u l y 1979
30 J u l y 1984
19 A p r i l 1987
26 November 1981
22 November 1984
19 November 1987
AMENDMENT 15
t o t h e
I n t e r n a t i o n a l S t a n d a r d s
UNITS OF MEASUREMENT TO BE USED I N
A I R AND GROUND OPERATIONS
\
(Annex 5 t o t h e Convention on I n t e r n a t i o n a l C i v i l A v i a t i o n )
1. I n s e r t t h e f o l l o w i n g replacement pages i n Annex 5 ( F o u r t h E d i t i o n ) ,
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