ISO
8601:2000(E)
©
ISO
2000
All
rights
reserved
15
5.2.3.4
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:
±
YYYYYWwwD
EXAMPLE
+001985W155
Extended
format:
±
YYYYY-Www-D
EXAMPLE
+001985-W15-5
b)
A
specific
week
Basic
format:
±
YYYYYWww
EXAMPLE
+001985W15
Extended
format:
±
YYYYY-Www
EXAMPLE
+001985-W15
NOTE
5.2.3.4
includes
the
definition
of
representations
that
both
expanded
and
have
reduced
precision.
5.3
Time
of
the
day
As
this
International
Standard
is
based
on
the
24-hour
timekeeping
system
that
is
now
in
common
use,
hours
are
represented
by
two
digits
from
[00]
to
[24],
minutes
are
represented
by
two
digits
from
[00]
to
[59],
and
seconds
are
represented
by
two
digits
from
[00]
to
[60].
For
most
purposes,
times
will
be
represented
by
four
digits
[hhmm].
The
representation
of
the
hour
by
[24]
is
only
allowed
to
indicate
midnight,
see
5.3.2.
The
representation
of
the
second
by
[60]
is
only
allowed
to
indicate
the
positive
leap
second
or
a
time-point
within
that
second.
5.3.1
Local
time
of
the
day
5.3.1.1
Complete
representation
When
the
application
identifies
the
need
for
an
expression
only
of
a
time
of
the
day
then
the
complete
representation
shall
be
a
single
numeric
data
element
comprising
six
digits
in
the
basic
format,
where
[hh]
represents
hours,
[mm]
minutes
and
[ss]
seconds.
Basic
format:
hhmmss
EXAMPLE
232050
Extended
format:
hh:mm:ss
EXAMPLE
23:20:50
5.3.1.2
Representations
with
reduced
precision
If
the
degree
of
precision
required
permits,
either
two
or
four
digits
may
be
omitted
from
the
representation
in
5.3.1.1.
a)
A
specific
hour
and
minute
Basic
format:
hhmm
EXAMPLE
2320
Extended
format:
hh:mm
EXAMPLE
23:20
b)
A
specific
hour
Basic
format:
hh
EXAMPLE
23
Extended
format:
not
applicable
5.3.1.3
Representation
of
decimal
fractions
If
necessary
for
a
particular
application
a
decimal
fraction
of
hour,
minute
or
second
may
be
included.
If
a
decimal
fraction
is
included,
lower
order
components
(if
any)
shall
be
omitted
and
the
decimal
fraction
shall
be
divided
from
the
integer
part
by
the
decimal
sign
specified
in
ISO
31-0:
i.e.
the
comma
[,]
or
full
stop
[.].
Of
these,
the
comma
is
the
preferred
sign.
If
the
magnitude
of
the
number
is
less
than
unity,
the
decimal
sign
shall
be
preceded
by
two
zeros
in
accordance
with
4.8.
