john-bodley commented on a change in pull request #8464: [sql] Fixing datetime 
SQL literal
URL: 
https://github.com/apache/incubator-superset/pull/8464#discussion_r339846559
 
 

 ##########
 File path: superset/db_engine_specs/bigquery.py
 ##########
 @@ -72,11 +72,13 @@ class BigQueryEngineSpec(BaseEngineSpec):
     }
 
     @classmethod
-    def convert_dttm(cls, target_type: str, dttm: datetime) -> str:
+    def convert_dttm(cls, target_type: str, dttm: datetime) -> Optional[str]:
         tt = target_type.upper()
         if tt == "DATE":
-            return "'{}'".format(dttm.strftime("%Y-%m-%d"))
-        return "'{}'".format(dttm.strftime("%Y-%m-%d %H:%M:%S"))
+            return f"CAST('{dttm.isoformat()[:10]}' AS DATE)"
+        if tt == "TIMESTAMP":
 
 Review comment:
   @betodealmeida do you know why the `TIMESTAMP` type wasn't defined for 
BigQuery?

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