diff --git a/test/scapy/layers/tls/cert.uts b/test/scapy/layers/tls/cert.uts
index 35a8d050059..cb3b363397e 100644
--- a/test/scapy/layers/tls/cert.uts
+++ b/test/scapy/layers/tls/cert.uts
@@ -329,7 +329,13 @@ x.notAfter == (2026, 3, 30, 7, 38, 59, 0, 89, -1)
 
 = Cert class : test remainingDays
 assert abs(x.remainingDays("02/12/11")) > 5000
-assert abs(x.remainingDays("Feb 12 10:00:00 2011 Paris, Madrid")) > 1
+assert abs(x.remainingDays("Feb 12 10:00:00 2011 UTC")) > 5000
+
+from unittest.mock import patch
+import time
+
+with patch('time.localtime', return_value=time.struct_time((2026, 3, 1, 0, 0, 0, 6, 60, 0))):
+    assert abs(x.remainingDays("Feb 12 10:00:00 2011 Paris, Madrid")) > 1
 
 = Cert class : Checking RSA public key
 assert type(x.pubkey) is PubKeyRSA
@@ -1104,4 +1110,4 @@ assert [x.buffer for x in aikOpaque.policyDigestList.digests] == [
     b'\xc4\x13\xa8G\xb1\x11\x12\xb1\xcb\xdd\xd4\xec\xa4\xda\xaa\x15\xa1\x85,\x1c;\xbaWF\x1d%v\x05\xf3\xd5\xafS',
     b'',
     b'\x04\x8e\x9a:\xce\x08X?y\xf3D\xffx[\xbe\xa9\xf0z\xc7\xfa3%\xb3\xd4\x9a!\xddQ\x94\xc6XP',
-]
\ No newline at end of file
+]