Add mandoc-manpage for date(1) and clean up code

and mark it as finished in README.

README

@@ -23,7 +23,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
 =  cp              no                              -H, -i, -L
 =* cron            non-posix                       none
 #* cut             yes                             none
-=  date            yes                             none
+=* date            yes                             none
 =  dirname         yes                             none
 =  du              no                              -H, -L, -x
 =  echo            yes                             none

date.1

@@ -1,26 +1,38 @@
-.TH DATE 1 sbase\-VERSION
-.SH NAME
-date \- print date and time
-.SH SYNOPSIS
-.B date
-.RB [ \-d
-.IR time ]
-.RB [ \-u ]
-.RI [+ format ]
-.SH DESCRIPTION
-.B date
-prints the date and time. If a
-.I format
-is given it is used to format the date as per
-.IR strftime (3).
-.SH OPTIONS
-.TP
-.BI \-d " time"
-prints
-.I time
-instead of the system time, given as the number of seconds since the Unix epoch.
-.TP
-.B \-u
-prints UTC time instead of local time.
-.SH SEE ALSO
-.IR strftime (3)
+.Dd January 23, 2015
+.Dt DATE 1 sbase\-VERSION
+.Sh NAME
+.Nm date
+.Nd print date and time
+.Sh SYNOPSIS
+.Nm date
+.Op Fl d Ar time
+.Op Fl u
+.Op Cm + Ns Ar format
+.Sh DESCRIPTION
+.Nm
+prints the date and time according to
+.Xr locale 7
+or
+.Ar format
+using
+.Xr strftime 3 .
+.Sh OPTIONS
+.Bl -tag -width Ds
+.It Fl d Ar time
+Print
+.Ar time
+given as the number of seconds since the
+Unix epoch 1970-01-01T00:00:00Z.
+.It Fl u
+Print UTC time instead of local time.
+.El
+.Sh STANDARDS
+The
+.Nm
+utility is compliant with the
+.St -p1003.1-2008
+specification.
+.Pp
+The
+.Op Fl d
+flag is an extension to that specification.

date.c

@@ -34,12 +34,13 @@ main(int argc, char *argv[])
 	default:
 		usage();
 	} ARGEND;
+
 	if (argc > 0 && argv[0][0] == '+')
 		fmt = &argv[0][1];
 	if (!(now = tztime(&t)))
 		eprintf("%stime failed\n", tz);
 
-	strftime(buf, sizeof buf, fmt, now);
+	strftime(buf, sizeof(buf), fmt, now);
 	puts(buf);
 
 	return 0;