<s>
Clock	O
is	O
a	O
timekeeping	O
mobile	B-Application
app	I-Application
available	O
since	O
the	O
initial	O
launch	O
of	O
the	O
iPhone	B-Device
and	O
iPhone	B-Operating_System
OS	I-Operating_System
1	I-Operating_System
in	O
2007	O
,	O
with	O
a	O
version	O
later	O
released	O
for	O
iPads	B-Device
with	O
iOS	B-Operating_System
6	I-Operating_System
,	O
and	O
Macs	O
with	O
the	O
release	O
of	O
macOS	B-Operating_System
Ventura	I-Operating_System
.	O
</s>
<s>
The	O
app	O
icon	O
shows	O
the	O
device	O
's	O
current	O
time	O
when	O
viewed	O
from	O
the	O
home	O
screen	O
,	O
making	O
it	O
one	O
of	O
the	O
only	O
iOS	B-Application
apps	O
with	O
a	O
dynamic	O
icon	O
(	O
the	O
other	O
being	O
Calendar	B-Operating_System
)	O
.	O
</s>
<s>
On	O
all	O
versions	O
except	O
iOS	B-Application
,	O
the	O
world	O
clock	O
will	O
also	O
display	O
the	O
sunrise	O
and	O
sunset	O
time	O
for	O
each	O
location	O
,	O
as	O
well	O
as	O
a	O
map	O
which	O
displays	O
where	O
it	O
is	O
currently	O
night	O
and	O
day	O
.	O
</s>
<s>
Users	O
can	O
also	O
set	O
a	O
sleep	O
schedule	O
,	O
which	O
notifies	O
users	O
to	O
wind	O
down	O
when	O
their	O
set	O
bedtime	O
is	O
approaching	O
and	O
sets	O
the	O
device	O
into	O
sleep	B-Operating_System
focus	I-Operating_System
mode	O
.	O
</s>
<s>
This	O
feature	O
integrates	O
with	O
the	O
Health	B-Application
application	O
to	O
track	O
sleep	O
data	O
.	O
</s>
<s>
Since	O
iOS	B-Application
10	O
,	O
an	O
analouge	O
stopwatch	O
face	O
can	O
accessed	O
by	O
swiping	O
to	O
the	O
left	O
.	O
</s>
<s>
Additionally	O
,	O
the	O
watchOS	B-Device
version	O
of	O
stopwatch	O
also	O
includes	O
graph	O
and	O
hybrid	O
faces	O
.	O
</s>
<s>
On	O
watchOS	B-Device
,	O
there	O
are	O
a	O
number	O
of	O
pre-set	O
timer	O
intervals	O
available	O
for	O
faster	O
access	O
,	O
and	O
multiple	O
timers	O
can	O
be	O
set	O
at	O
one	O
time	O
.	O
</s>
<s>
As	O
of	O
iOS	B-Application
11	O
,	O
the	O
timer	O
can	O
be	O
set	O
from	O
1	O
second	O
up	O
to	O
23	O
hours	O
,	O
59	O
minutes	O
,	O
and	O
59	O
seconds	O
.	O
</s>
