diff --git a/clickhouse.ts b/clickhouse.ts
index 158e437..bbfd30e 100644
--- a/clickhouse.ts
+++ b/clickhouse.ts
@@ -15,6 +15,7 @@ export const client = createClient({
     async_insert: 1,
     output_format_json_quote_64bit_integers: 0,
     output_format_json_quote_64bit_floats: 0,
+    date_time_input_format: "best_effort",
   },
 });
 
diff --git a/ingest-option-quotes.ts b/ingest-option-quotes.ts
index 01d1e8e..29e8ed1 100644
--- a/ingest-option-quotes.ts
+++ b/ingest-option-quotes.ts
@@ -69,9 +69,7 @@ for (const date of dateRange("2024-05-02", "2024-05-03")) {
                     symbol: contract.underlying_ticker,
                     expiration_date: contract.expiration_date,
                     strike: contract.strike_price,
-                    ts: new Date(
-                      Math.floor(sip_timestamp / 1000)
-                    ).toISOString(),
+                    ts: new Date(Math.floor(sip_timestamp / 1000)),
                     bid: bid_price,
                     ask: ask_price,
                   })