diff --git a/usr.sbin/ac/ac.c b/usr.sbin/ac/ac.c
index b82a7e72c9a2..1543568bd7ce 100644
--- a/usr.sbin/ac/ac.c
+++ b/usr.sbin/ac/ac.c
@@ -473,7 +473,8 @@ ac(fp)
 		if (!FirstTime)
 			FirstTime = usr.ut_time;
 		if (Flags & AC_D) {
-			ltm = localtime(&usr.ut_time);
+			time_t t = int_to_time(usr.ut_time);
+			ltm = localtime(&t);
 			if (day >= 0 && day != ltm->tm_yday) {
 				day = ltm->tm_yday;
 				/*
@@ -524,7 +525,8 @@ ac(fp)
 	(void)strcpy(usr.ut_line, "~");
 
 	if (Flags & AC_D) {
-		ltm = localtime(&usr.ut_time);
+		time_t t = int_to_time(usr.ut_time);
+		ltm = localtime(&t);
 		if (day >= 0 && day != ltm->tm_yday) {
 			/*
 			 * print yesterday's total