ISO
8601:2000(E)
©
ISO
2000
All
rights
reserved
21
5.5.3.2
Alternative
format
By
mutual
agreement
of
the
partners
in
information
interchange,
duration
may
be
expressed
in
conformity
with
the
format
used
for
time-points,
as
specified
in
5.2.1,
5.2.2,
5.2.3,
5.3.1.5
and
5.4,
where
the
formats
of
5.4
are
restricted
for
the
date
component
to
the
formats
in
5.2.1
and
for
the
time-of-the-day
component
to
the
formats
in
5.3.1.1
through
5.3.1.3.
The
values
expressed
must
not
exceed
the
"carry-over
points"
of
12
months,
30
days,
24
hours,
60
minutes
and
60
seconds.
Since
weeks
have
no
defined
carry-over
point
(52
or
53),
weeks
should
not
be
used
in
these
applications.
In
these
expressions
the
year
component
may
have
the
value
[0000]
and
the
month
and
day-of-the-
month
components
may
have
the
value
[00].
Truncated
representations
may
only
be
used
if
the
omitted
components
are
zero.
5.5.4
Complete
representations
Where
complete
representations
using
calendar
dates
in
a
time-point
component
are
shown
in
5.5.4,
a
complete
representation
of
ordinal
dates
(5.2.2)
or
of
dates
identified
by
week
number
(5.2.3)
may
be
substituted
for
the
calendar
date.
Where
complete
representations
using
local-time-of-the-day
in
a
time-point
component
are
shown
in
5.5.4,
a
complete
representation
of
coordinated
universal
time
(5.3.3)
or
local
time
and
the
difference
with
Coordinated
Universal
Time
(5.3.4.2)
may
be
substituted
for
local-time-of-the-day.
Where
complete
representations
using
the
expression
PnYnMnDTnHnMnS
in
a
duration
component
are
shown
in
5.5.4,
the
expression
PnW
(5.5.4.2.1)
may
be
substituted
in
a
similar
fashion.
5.5.4.1
Representation
of
time-intervals
identified
by
start
and
end
When
the
application
identifies
the
need
for
a
complete
representation
of
a
time-interval,
identified
by
its
start
and
its
end,
it
shall
use
an
expression
in
accordance
with
5.5.2
combining
any
two
complete
date
and
time
of
the
day
representations
as
defined
in
5.4.1,
provided
that
the
resulting
expression
is
either
consistently
in
basic
format
or
consistently
in
extended
format.
Basic
format:
YYYYMMDDThhmmss/YYYYMMDDThhmmss
EXAMPLE
19850412T232050/19850625T103000
Extended
format:
YYYY-MM-DDThh:mm:ss/YYYY-MM-DDThh:mm:ss
EXAMPLE
1985-04-12T23:20:50/1985-06-25T10:30:00
A
time-interval
beginning
at
20
minutes
and
50
seconds
past
23
hours
on
12
April
1985
local
time
and
ending
at
30
minutes
past
10
hours
on
25
June
1985
local
time.
5.5.4.2
Representation
of
time-interval
by
duration
only
5.5.4.2.1
Format
with
time-unit
designators
When
an
application
identifies
the
need
for
a
complete
representation
of
a
time-interval
through
its
duration
only,
with
duration
in
the
format
with
time-unit
designators,
it
shall
use
an
expression
in
accordance
with
5.5.2
using
a
complete
duration
representation
as
defined
in
5.5.3.1.
Basic
and
extended
format:
PnYnMnDTnHnMnS
PnW
EXAMPLE
P2Y10M15DT10H30M20S
A
time-interval
with
a
duration
of
two
years,
10
months,
15
days,
10
hours,
30
minutes
and
20
seconds.
P6W
A
time-interval
with
a
duration
of
six
weeks.
