parse_date: handle dates in 2038 and beyond if time_t is big enough

libarchive/archive_parse_date.c

@@ -703,9 +703,7 @@ Convert(time_t Month, time_t Day, time_t Year,
 		Year += 1900;
 	DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0)
 	    ? 29 : 28;
-	/* Checking for 2038 bogusly assumes that time_t is 32 bits.  But
-	   I'm too lazy to try to check for time_t overflow in another way.  */
-	if (Year < EPOCH || Year >= 2038
+	if (Year < EPOCH || (sizeof(time_t) <= 4 && Year >= 2038)
 	    || Month < 1 || Month > 12
 	    /* Lint fluff:  "conversion from long may lose accuracy" */
 	    || Day < 1 || Day > DaysInMonth[(int)--Month]

libarchive/test/test_archive_parse_date.c

@@ -39,6 +39,8 @@ DEFINE_TEST(test_archive_parse_date)
 	assertEqualInt(get_date(now, "Jan 1, 1970 UTC"), 0);
 	assertEqualInt(get_date(now, "7:12:18-0530 4 May 1983"), 420900138);
 	assertEqualInt(get_date(now, "2004/01/29 513 mest"), 1075345980);
+	assertEqualInt(get_date(now, "2038-06-01 00:01:02 UTC"),
+	    sizeof(time_t) <= 4 ? -1 : 2158963262);
 	assertEqualInt(get_date(now, "99/02/17 7pm utc"), 919278000);
 	assertEqualInt(get_date(now, "02/17/99 7:11am est"), 919253460);
 	assertEqualInt(get_date(now, "now - 2 hours"),