Index: calendar.1
===================================================================
RCS file: /cvsroot/src/usr.bin/calendar/calendar.1,v
retrieving revision 1.25
diff -u -r1.25 calendar.1
--- calendar.1	8 Jun 2010 03:08:47 -0000	1.25
+++ calendar.1	1 Jun 2016 20:40:40 -0000
@@ -29,7 +29,7 @@
 .\"
 .\"     @(#)calendar.1	8.1 (Berkeley) 6/29/93
 .\"
-.Dd August 27, 2009
+.Dd June 1, 2016
 .Dt CALENDAR 1
 .Os
 .Sh NAME
@@ -37,7 +37,7 @@
 .Nd reminder service
 .Sh SYNOPSIS
 .Nm
-.Op Fl ax
+.Op Fl avx
 .Op Fl d Ar MMDD[[YY]YY]
 .Op Fl f Ar file
 .Op Fl l Ar days
@@ -95,6 +95,11 @@
 The default value is two, which causes
 .Nm
 to print entries through the weekend on Fridays.
+.It Fl v
+Causes
+.Nm
+to print version information for itself,
+and then exit.
 .It Fl x
 Causes
 .Nm
Index: calendar.c
===================================================================
RCS file: /cvsroot/src/usr.bin/calendar/calendar.c,v
retrieving revision 1.52
diff -u -r1.52 calendar.c
--- calendar.c	1 Jul 2015 06:48:25 -0000	1.52
+++ calendar.c	1 Jun 2016 20:40:40 -0000
@@ -65,6 +65,8 @@
 
 #include "pathnames.h"
 
+#define CALENDAR_VERSION	"calendar-20160601"
+
 	/* flags used by calendar file parser */
 #define	F_ISMONTH	0x01
 #define	F_ISDAY		0x02
@@ -133,7 +135,7 @@
 
 	(void)setprogname(argv[0]);	/* for portability */
 
-	while ((ch = getopt(argc, argv, "-ad:f:l:w:x")) != -1) {
+	while ((ch = getopt(argc, argv, "-ad:f:l:vw:x")) != -1) {
 		switch (ch) {
 		case '-':		/* backward contemptible */
 		case 'a':
@@ -152,6 +154,9 @@
 		case 'l':
 			atodays(ch, optarg, &lookahead);
 			break;
+		case 'v':
+			printf("%s\n", CALENDAR_VERSION);
+			return 0;
 		case 'w':
 			atodays(ch, optarg, &weekend);
 			break;