diff --git a/aries_cloudagent/vc/ld_proofs/suites/bbs_bls_signature_2020.py b/aries_cloudagent/vc/ld_proofs/suites/bbs_bls_signature_2020.py
index 233661b88d..78a820e45f 100644
--- a/aries_cloudagent/vc/ld_proofs/suites/bbs_bls_signature_2020.py
+++ b/aries_cloudagent/vc/ld_proofs/suites/bbs_bls_signature_2020.py
@@ -63,7 +63,9 @@ async def create_proof(
             date = self.date or datetime.now(timezone.utc)
             if not date.tzinfo:
                 date = utc.localize(date)
-            proof["created"] = date.isoformat()
+            proof["created"] = (
+                date.replace(tzinfo=None).isoformat(timespec="seconds") + "Z"
+            )
 
         # Allow purpose to update the proof; the `proof` is in the
         # SECURITY_CONTEXT_URL `@context` -- therefore the `purpose` must
diff --git a/aries_cloudagent/vc/ld_proofs/suites/linked_data_signature.py b/aries_cloudagent/vc/ld_proofs/suites/linked_data_signature.py
index a4547041be..4bca5b7edd 100644
--- a/aries_cloudagent/vc/ld_proofs/suites/linked_data_signature.py
+++ b/aries_cloudagent/vc/ld_proofs/suites/linked_data_signature.py
@@ -100,7 +100,9 @@ async def create_proof(
             date = self.date or datetime.now(timezone.utc)
             if not date.tzinfo:
                 date = utc.localize(date)
-            proof["created"] = date.isoformat()
+            proof["created"] = (
+                date.replace(tzinfo=None).isoformat(timespec="seconds") + "Z"
+            )
 
         # Allow purpose to update the proof; the `proof` is in the
         # SECURITY_CONTEXT_URL `@context` -- therefore the `purpose` must