diff --git a/cups/http-support.c b/cups/http-support.c
index dfdfb1063..599f696ed 100644
--- a/cups/http-support.c
+++ b/cups/http-support.c
@@ -772,7 +772,10 @@ httpGetDateTime(const char *s)		// I - Date/time string
   DEBUG_printf("4httpGetDateTime: day=%d, mon=\"%s\", year=%d, hour=%d, min=%d, sec=%d", day, mon, year, hour, min, sec);
 
   // Check for invalid year (RFC 7231 says it's 4DIGIT)
-  if (year > 9999)
+  if (year < 0 || year > 9999)
+    return (0);
+
+  if (day < 1 || day > 31 || hour < 0 || hour > 23 || min < 0 || min > 59 || sec < 0 || sec > 60)
     return (0);
 
   // Convert the month name to a number from 0 to 11.