<s>
The	O
Daytime	B-Protocol
Protocol	I-Protocol
is	O
a	O
service	O
in	O
the	O
Internet	B-Protocol
Protocol	I-Protocol
Suite	I-Protocol
,	O
defined	O
in	O
1983	O
in	O
RFC	O
867	O
.	O
</s>
<s>
A	O
host	O
may	O
connect	O
to	O
a	O
server	O
that	O
supports	O
the	O
Daytime	B-Protocol
Protocol	I-Protocol
on	O
either	O
Transmission	B-Protocol
Control	I-Protocol
Protocol	I-Protocol
(	O
TCP	O
)	O
or	O
User	B-Protocol
Datagram	I-Protocol
Protocol	I-Protocol
(	O
UDP	O
)	O
port	O
13	O
.	O
</s>
<s>
On	O
UNIX-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
a	O
daytime	B-Protocol
server	O
is	O
usually	O
built	O
into	O
the	O
inetd	B-Protocol
(	O
or	O
xinetd	B-Operating_System
)	O
daemon	B-Operating_System
.	O
</s>
<s>
It	O
may	O
be	O
enabled	O
by	O
adding	O
the	O
following	O
lines	O
to	O
the	O
file	O
and	O
telling	O
inetd	B-Protocol
to	O
reload	O
its	O
configuration	O
:	O
</s>
