Handle dates past January 19th, 2038

Try to support dates past year 2038 on systems with 64-bit time_t.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/args.c

@@ -310,7 +310,7 @@ date_arg_from_to(long from, long to, int add_line, const char *fmt_apt,
 	}
 }
 
-static int parse_datearg(const char *str)
+static long parse_datearg(const char *str)
 {
 	struct date day;
 
@@ -329,7 +329,7 @@ static int parse_datearg(const char *str)
 	return -1;
 }
 
-static int parse_datetimearg(const char *str)
+static long parse_datetimearg(const char *str)
 {
 	char *date = mem_strdup(str);
 	char *time;

src/ui-calendar.c

@@ -630,9 +630,7 @@ void ui_calendar_change_day(int datefmt)
 	char *outstr;
 	int dday, dmonth, dyear;
 	int wrong_day = 1;
-	const char *mesg_line1 =
-	    _("The day you entered is not valid "
-	      "(should be between 01/01/1902 and 12/31/2037)");
+	const char *mesg_line1 = _("The day you entered is not valid");
 	const char *mesg_line2 = _("Press [ENTER] to continue");
 	const char *request_date =
 	    _("Enter the day to go to [ENTER for today] : %s");
@@ -739,10 +737,6 @@ void ui_calendar_move(enum move move, int count)
 			t.tm_mday = 1;
 			t.tm_mon = 0;
 			t.tm_year = 2;
-		} else if (t.tm_year > 137) {
-			t.tm_mday = 31;
-			t.tm_mon = 11;
-			t.tm_year = 137;
 		}
 
 		slctd_day.dd = t.tm_mday;

src/utils.c

@@ -651,10 +651,8 @@ char *new_tempfile(const char *prefix)
  */
 int check_date(unsigned year, unsigned month, unsigned day)
 {
-	return (year >= 1902 && year <= 2037 && month >= 1 && month <= 12
-		&& day >= 1 && day <= days[month - 1] + (month == 2
-							 && ISLEAP(year)) ?
-		1 : 0);
+	return (year >= 1902 && month >= 1 && month <= 12 && day >= 1 &&
+		day <= days[month - 1] + (month == 2 && ISLEAP(year)) ? 1 : 0);
 }
 
 /*

test/data/apts-y2k38-001

@@ -0,0 +1,4 @@
+01/19/2038 [1] Event 1
+01/20/2038 [1] Event 2
+01/01/2100 [1] Event 3
+01/01/9999 [1] Event 4

test/y2k38-001.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+
+. "${TEST_INIT:-./test-init.sh}"
+
+if [ "$1" = 'actual' ]; then
+  "$CALCURSE" --read-only -D "$DATA_DIR"/ -c "$DATA_DIR/apts-y2k38-001" \
+    -d01/19/2038
+  "$CALCURSE" --read-only -D "$DATA_DIR"/ -c "$DATA_DIR/apts-y2k38-001" \
+    -d01/20/2038
+  "$CALCURSE" --read-only -D "$DATA_DIR"/ -c "$DATA_DIR/apts-y2k38-001" \
+    -d01/01/2100
+  "$CALCURSE" --read-only -D "$DATA_DIR"/ -c "$DATA_DIR/apts-y2k38-001" \
+    -d01/01/9999
+elif [ "$1" = 'expected' ]; then
+  cat <<EOD
+01/19/38:
+ * Event 1
+01/20/38:
+ * Event 2
+01/01/00:
+ * Event 3
+01/01/99:
+ * Event 4
+EOD
+else
+  ./run-test "$0"
+fi