ISO
8601:2000(E)
©
ISO
2000
All
rights
reserved
13
5.2.2
Ordinal
date
In
expressions
of
ordinal
dates
¾
day
of
the
year
is
represented
by
three
decimal
digits.
The
first
day
of
any
year
is
represented
by
[001]
and
subsequent
days
are
numbered
in
ascending
sequence;
¾
year
is
represented
as
in
5.2.1.
5.2.2.1
Complete
representation
When
the
application
identifies
the
need
for
a
complete
representation
of
an
ordinal
date,
it
shall
be
one
of
the
numeric
expressions
as
follows,
where
[YYYY]
represents
a
calendar
year
and
[DDD]
the
ordinal
number
of
a
day
within
the
year.
Basic
format:
YYYYDDD
EXAMPLE
1985102
Extended
format:
YYYY-DDD
EXAMPLE
1985-102
5.2.2.2
Truncated
representations
If,
by
agreement,
truncated
representations
are
used,
the
basic
formats
shall
be
as
specified
below.
In
each
case
hyphens
that
indicate
omitted
components
shall
be
used
only
as
indicated
or
shall
be
omitted.
a)
A
specific
year
and
day
in
the
implied
century
Basic
format:
YYDDD
EXAMPLE
85102
Extended
format:
YY-DDD
EXAMPLE
85-102
b)
Day
only
in
the
implied
year
Basic
format:
-DDD
EXAMPLE
-102
Extended
format:
not
applicable
NOTE
Logically,
the
representation
should
be
[--DDD],
but
the
first
hyphen
is
superfluous
and,
therefore,
it
has
been
omitted.
5.2.2.3
Expanded
representations
If,
by
agreement,
expanded
representations
are
used
the
basic
formats
shall
be
as
specified
below.
In
the
examples
below
it
has
been
agreed
to
expand
the
time
element
year
with
two
digits.
a)
A
specific
day
Basic
format:
±
YYYYYDDD
EXAMPLE
+001985102
Extended
format:
±
YYYYY-DDD
EXAMPLE
+001985-102
5.2.3
Week
date
In
expressions
of
week
dates
¾
day
of
the
week
is
represented
by
one
decimal
digit.
Monday
shall
be
identified
as
day
[1]
of
any
calendar
week,
and
subsequent
days
of
the
same
week
shall
be
numbered
in
ascending
sequence
to
Sunday
(day
[7]).
¾
calendar
week
is
represented
by
two
decimal
digits.
The
first
calendar
week
of
a
year
shall
be
identified
as
[01]
and
subsequent
weeks
shall
be
numbered
in
ascending
sequence.
¾
year
is
represented
as
in
5.2.1.
