ISO
8601:2000(E)
10
©
ISO
2000
All
rights
reserved
5
Representations
5.1
Explanations
5.1.1
Characters
used
in
place
of
digits
or
signs
[Y]
represents
a
digit
used
in
the
time
element
"year";
[M]
represents
a
digit
used
in
the
time
element
"month";
[D]
represents
a
digit
used
in
the
time
element
"day";
[w]
represents
a
digit
used
in
the
time
element
"week";
[h]
represents
a
digit
used
in
the
time
element
"hour";
[m]
represents
a
digit
used
in
the
time
element
"minute";
[s]
represents
a
digit
used
in
the
time
element
"second";
[n]
represents
digit(s),
constituting
a
positive
integer
or
zero;
[
±
]
represents
a
plus
sign
[+]
if
in
combination
with
the
following
element
a
positive
value
or
zero
needs
to
be
represented,
or
a
minus
sign
[]
if
in
combination
with
the
following
element
a
negative
value
needs
to
be
represented.
In
addition
the
following
convention
applies:
When
any
of
the
characters
representing
a
digit
is
underlined,
it
represents
zero
or
more
digits
in
the
corresponding
time
element.
The
number
of
digits
is
to
be
determined
by
the
interchanging
partners.
5.1.2
Characters
used
as
designators
[P]
is
used
as
time-interval
(period)
designator,
preceding
a
data
element
which
represents
a
given
duration
of
a
time-interval;
[R]
is
used
as
recurring
time-interval
designator,
preceding
a
data
element
which
represents
a
given
duration
of
one
time-interval
of
a
recurring
time-interval
or
the
total
expression
if
there
is
no
duration
data
element;
[T]
is
used
as
time
designator
to
indicate:
¾
the
start
of
the
representation
of
local
time
if
it
is
necessary
or
desirable
to
designate
time
of
the
day
expressions
as
such,
¾
the
start
of
the
representation
of
the
time
of
the
day
in
combined
date
and
time
of
day
expressions,
¾
the
start
of
the
representation
of
the
time-units
for
hour,
minute
or
second
in
expressions
of
duration;
[W]
is
used
as
week
designator,
preceding
a
data
element
which
represents
the
ordinal
number
of
a
calendar
week
within
the
year;
[Z]
is
used
as
UTC
designator,
immediately
(without
space)
following
a
data
element
expressing
the
time
of
the
day
in
Coordinated
Universal
Time
(UTC);
In
representations
of
duration
(5.5.3.1),
the
following
characters
are
also
used
as
part
of
the
representation
when
required:
