From ee9bc59982d51a40d73ded26717cef998eaaeeed Mon Sep 17 00:00:00 2001
From: Brooks Davis <brooks@FreeBSD.org>
Date: Thu, 1 May 2014 22:28:14 +0000
Subject: [PATCH] Fix a 2038 bug.

If time_t is 64-bit (i.e. isn't 32-bit) allow any value of year, not
just years less than 2038.

Don't bother fixing the underflow in the case of years before 1903.

MFC after:	1 week
Sponsored by:	DARPA, AFRL
---
 sys/kern/subr_clock.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/kern/subr_clock.c b/sys/kern/subr_clock.c
index dbd74f756275..f30f529dbdba 100644
--- a/sys/kern/subr_clock.c
+++ b/sys/kern/subr_clock.c
@@ -46,6 +46,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/kernel.h>
 #include <sys/bus.h>
 #include <sys/clock.h>
+#include <sys/limits.h>
 #include <sys/sysctl.h>
 #include <sys/timetc.h>
 
@@ -147,7 +148,7 @@ clock_ct_to_ts(struct clocktime *ct, struct timespec *ts)
 	if (ct->mon < 1 || ct->mon > 12 || ct->day < 1 ||
 	    ct->day > days_in_month(year, ct->mon) ||
 	    ct->hour > 23 ||  ct->min > 59 || ct->sec > 59 ||
-	    ct->year > 2037) {		/* time_t overflow */
+	    (sizeof(time_t) == 4 && year > 2037)) {	/* time_t overflow */
 		if (ct_debug)
 			printf(" = EINVAL\n");
 		return (EINVAL);