feat: optimize timezone

api/core/orchestrator_rule_parser.py

@@ -251,7 +251,7 @@ class OrchestratorRuleParser:
         tool = Tool(
             name="current_datetime",
             description="A tool when you want to get the current date, time, week, month or year, "
-                        "and the time zone is UTC+0000.",
+                        "and the time zone is UTC.",
             func=helper.get_current_datetime,
             callbacks=[DifyStdOutCallbackHandler()]
         )