diff --git a/README.md b/README.md
index d1cc41f..6ab0ba6 100644
--- a/README.md
+++ b/README.md
@@ -6,3 +6,7 @@ Build:
 sudo apt build-dep bsdmainutils
 make
 ```
+
+## Known issues
+
+Cursor can be moved out of the visible calendar.
diff --git a/ncal.c b/ncal.c
index cda6ccd..02cc185 100644
--- a/ncal.c
+++ b/ncal.c
@@ -170,6 +170,10 @@ static void printmonthr(int line, int col, int y, int m, int jd_flag,
 static void printmonthb(int line, int col, int y, int m, int jd_flag,
     int highlightdate);
 static void	mkweekdays(struct weekdays * wds);
+static void	processkeyr(int key, int year, int m, int jd_flag,
+    int before, int after, int *highlightdate);
+static void	processkeyb(int key, int year, int m, int jd_flag,
+    int before, int after, int *highlightdate);
 static void	monthranger(int year, int m, int jd_flag,
     int before, int after, int highlightdate);
 static void	monthrangeb(int year, int m, int jd_flag,
@@ -562,13 +566,20 @@ main(int argc, char *argv[])
 		int key;
 		initscr();
 		noecho();
+		curs_set(0);
+		keypad(stdscr, 1);
 		do {
 			clear();
-			if (flag_backward)
+			if (flag_backward) {
 				monthrangeb(y, m, flag_julian_day, before, after, highlightdate);
-			else
+				key = getch();
+				processkeyb(key, y, m, flag_julian_day, before, after, &highlightdate);
+			} else {
 				monthranger(y, m, flag_julian_day, before, after, highlightdate);
-			key = getch();
+				key = getch();
+				mvprintw(30, 60, "%d %d", key, highlightdate);
+				processkeyr(key, y, m, flag_julian_day, before, after, &highlightdate);
+			}
 		} while (key != 'q');
 		endwin();
 	}
@@ -1068,6 +1079,97 @@ printmonthb(int line, int col, int y, int m, int jd_flag, int highlightdate)
 	weekstart++;
 }
 
+static void
+processkeyb(int key, int y, int m, int jd_flag, int before, int after, int *highlightdate)
+{
+	struct weekdays wds;
+	char	s[MAX_WIDTH], t[MAX_WIDTH];
+	wchar_t	ws[MAX_WIDTH], ws1[MAX_WIDTH];
+	const char	*wdss;
+	int     i, j;
+	int     mpl;
+	int     mw;
+	int	m1, m2;
+	int	printyearheader;
+	int	prevyear = -1;
+
+	mpl = jd_flag ? 2 : 3;
+	mw = jd_flag ? MONTH_WIDTH_B_J : (flag_weeks ? MONTH_WIDTH_B_WW : MONTH_WIDTH_B_NW );
+	wdss = (mpl == 2) ? " " : "";
+
+	while (before > 0) {
+		DECREASEMONTH(m, y);
+		before--;
+		after++;
+	}
+	while (before < 0) {
+		INCREASEMONTH(m, y);
+		before++;
+		after--;
+	}
+	m1 = y * 12 + m - 1;
+	m2 = m1 + after;
+
+	switch (key) {
+	case KEY_UP:
+		*highlightdate -= 7;
+		break;
+	case KEY_DOWN:
+		*highlightdate += 7;
+		break;
+	case KEY_LEFT:
+		(*highlightdate)--;
+		break;
+	case KEY_RIGHT:
+		(*highlightdate)++;
+		break;
+	}
+}
+
+static void
+processkeyr(int key, int y, int m, int jd_flag, int before, int after, int *highlightdate)
+{
+	struct weekdays wds;
+	char    s[MAX_WIDTH], t[MAX_WIDTH];
+	int     i, j;
+	int     mpl;
+	int     mw;
+	int	m1, m2;
+	int	prevyear = -1;
+	int	printyearheader;
+
+	mpl = jd_flag ? 3 : 4;
+	mw = jd_flag ? MONTH_WIDTH_R_J : MONTH_WIDTH_R;
+
+	while (before > 0) {
+		DECREASEMONTH(m, y);
+		before--;
+		after++;
+	}
+	while (before < 0) {
+		INCREASEMONTH(m, y);
+		before++;
+		after--;
+	}
+	m1 = y * 12 + m - 1;
+	m2 = m1 + after;
+
+	switch (key) {
+	case KEY_UP:
+		(*highlightdate)--;
+		break;
+	case KEY_DOWN:
+		(*highlightdate)++;
+		break;
+	case KEY_LEFT:
+		*highlightdate -= 7;
+		break;
+	case KEY_RIGHT:
+		*highlightdate += 7;
+		break;
+	}
+}
+
 /* Put the local names of weekdays into the wds. */
 static void
 mkweekdays(struct weekdays *wds)