diff --git a/meilisearch/models/key.py b/meilisearch/models/key.py
index 977afe7a..ee88c4bf 100644
--- a/meilisearch/models/key.py
+++ b/meilisearch/models/key.py
@@ -38,7 +38,11 @@ class Config:
             json_encoders = {
                 datetime: lambda v: None
                 if not v
-                else f"{str(v).split('.', maxsplit=1)[0].replace(' ', 'T')}Z"
+                else (
+                    f"{str(v).split('+', maxsplit=1)[0].replace(' ', 'T')}Z"
+                    if "+" in str(v)
+                    else f"{str(v).replace(' ', 'T')}Z"
+                )
             }
 
 
@@ -103,7 +107,11 @@ class Config:
             json_encoders = {
                 datetime: lambda v: None
                 if not v
-                else f"{str(v).split('.', maxsplit=1)[0].replace(' ', 'T')}Z"
+                else (
+                    f"{str(v).split('+', maxsplit=1)[0].replace(' ', 'T')}Z"
+                    if "+" in str(v)
+                    else f"{str(v).replace(' ', 'T')}Z"
+                )
             }