ISO
8601:2000(E)
©
ISO
2000
All
rights
reserved
23
5.5.5
Representations
other
than
complete
A
representation
other
than
complete
of
a
time-interval
shall
be
an
expression
in
accordance
with
5.5.1
and
5.5.2,
where
time-points
are
represented
in
accordance
with
5.2,
5.3
or
5.4
and
where
duration
is
represented
in
accordance
with
5.5.3.1
or
5.5.3.2,
provided
that:
a)
the
rules
specified
in
those
sections
are
applied;
b)
the
result
is
not
a
complete
representation
in
accordance
with
5.5.4,
and
c)
for
which
the
resulting
expression
is
either
consistently
in
basic
format
or
consistently
in
extended
format;
d)
the
use
of
a
representation
needs
to
be
agreed
by
the
partners
in
information
interchange,
if
the
use
of
any
of
its
constituent
parts
needs
to
be
agreed
by
the
partners
in
information
interchange.
In
the
representation
of
time-intervals
in
accordance
with
5.5.1
a),
¾
if
higher
order
components
are
omitted
from
the
expression
following
the
solidus
(i.e.
the
representation
for
"end
of
time-interval"),
it
shall
be
assumed
that
the
corresponding
components
from
the
"start
of
time-interval"
expression
apply
(e.g.
if
[YYYYMM]
are
omitted
by
using
a
derived
representation,
the
end
of
the
time-interval
is
in
the
same
year
and
month
as
the
start
of
the
time-interval);
¾
representations
for
time-zones
and
Coordinated
Universal
Time
included
with
the
component
preceding
the
solidus
shall
be
assumed
to
apply
to
the
component
following
the
solidus,
unless
a
corresponding
alternative
is
included.
5.6
Recurring
time-intervals
5.6.1
Means
of
specifying
recurring
time-intervals
A
recurring
time-interval
shall
be
expressed
in
one
of
the
following
ways:
a)
By
a
number
of
recurrences
(optional),
a
start
and
an
end.
This
represents
a
recurring
time-interval
of
which
the
first
time-interval
is
identified
by
the
first
two
components
of
the
expression
and
the
number
of
recurrences
by
the
last
component.
If
the
last
component
is
absent
the
number
of
occurrences
is
unbounded.
b)
By
a
number
of
recurrences
(optional)
and
a
duration.
This
represents
a
recurring
time
interval
with
the
indicated
duration
for
each
time-interval
and
with
the
indicated
number
of
recurrences.
If
the
number
of
recurrences
is
absent
the
number
of
occurrences
is
unbounded.
c)
By
a
number
of
recurrences
(optional)
a
start
and
a
duration.
This
represents
a
recurring
time-interval
of
which
the
first
time-interval
is
identified
by
the
first
two
components
of
the
expression
and
the
number
of
recurrences
by
the
last
component.
If
the
last
component
is
absent
the
number
of
occurrences
is
unbounded.
d)
By
a
number
of
recurrences
(optional),
a
duration
and
an
end.
This
represents
a
recurring
time-interval
of
which
the
last
time-interval
is
identified
by
the
first
two
components
of
the
expression
and
the
number
of
recurrences
by
the
last
component.
If
the
last
component
is
absent
the
number
of
occurrences
is
unbounded.
5.6.2
Separators
and
designators
A
recursive
time
interval
is
expressed
according
to
the
following
rule:
All
representations
start
with
the
designator
[R],
followed,
without
spaces,
by
the
number
of
recurrences,
if
present,
followed,
without
spaces,
by
a
solidus
[/],
followed,
without
spaces,
by
the
expression
of
a
time
interval
in
accordance
with
5.5.1.
For
the
representation
5.6.1
a),
5.6.1
b),
5.6.1
c)
and
5.6.1
d)
the
time
interval
in
accordance
with
5.5.1
a),
5.5.1
b),
5.5.1
c)
and
5.5.1
d)
shall
be
used
respectively.
