Index: lib/libc/stdtime/strptime.c
===================================================================
--- lib/libc/stdtime/strptime.c
+++ lib/libc/stdtime/strptime.c
@@ -291,8 +291,10 @@
 			if (c == 'H' || c == 'k') {
 				if (i > 23)
 					return (NULL);
-			} else if (i > 12)
-				return (NULL);
+			} else {
+				if (i == 0 || i > 12)
+					return (NULL);
+			}
 
 			tm->tm_hour = i;