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Add -i and -t options to date for isodate and isotime display.

--- a/sys/man/1/date

+++ b/sys/man/1/date

@@ -24,6 +24,12 @@

 .B -n

 Report the date as the number of seconds since the

 epoch, 00:00:00 GMT, January 1, 1970.

+.TP

+.B -i

+Report the date as ISO-8601 without time and timezone suffix.

+.TP

+.B -t

+Report the date as ISO-8601 with time and timezone suffix.

 .PP

 The conversion from Greenwich Mean Time to local time depends on the

 .B $timezone

--- a/sys/src/cmd/date.c

+++ b/sys/src/cmd/date.c

@@ -1,17 +1,19 @@

 #include <u.h>

 #include <libc.h>

-int uflg, nflg;

+int uflg, nflg, iflg, tflg;

 void

 main(int argc, char *argv[])

 {

 	ulong now;

-

+	Tm *tm;

 	ARGBEGIN{

 	case 'n':	nflg = 1; break;

 	case 'u':	uflg = 1; break;

-	default:	fprint(2, "usage: date [-un] [seconds]\n"); exits("usage");

+	case 't':	tflg = 1; /* implies -i */

+	case 'i':	iflg = 1; break;

+	default:	fprint(2, "usage: date [-itun] [seconds]\n"); exits("usage");

 	}ARGEND

 	if(argc == 1)

@@ -21,10 +23,17 @@

 	if(nflg)

 		print("%ld\n", now);

-	else if(uflg)

-		print("%s", asctime(gmtime(now)));

-	else

-		print("%s", ctime(now));

-	

+	else if(iflg) {

+		tm = uflg ? gmtime(now) : localtime(now);

+		if(tflg)

+			print("%s\n", isotime(tm));

+		else

+			print("%s\n", isodate(tm));

+	} else {

+		if(uflg)

+			print("%s", asctime(gmtime(now)));

+		else

+			print("%s", ctime(now));

+	}

 	exits(0);

 }

-- 

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