add missing datetime conversion in fromJson

freqtrade/persistence/trade_model.py

@@ -1593,7 +1593,7 @@ class Trade(_DECL_BASE, LocalTrade):
                 average=order["average"],
                 cost=order["cost"],
                 filled=order["filled"],
-                order_date=order["order_date"],
+                order_date=datetime.strptime(order["order_date"], DATETIME_PRINT_FORMAT),
                 order_filled_date=(datetime.fromtimestamp(
                     order["order_filled_timestamp"] // 1000, tz=timezone.utc)
                     if order["order_filled_timestamp"] else None),

tests/persistence/test_trade_fromjson.py

@@ -178,3 +178,4 @@ def test_trade_fromjson():
     assert len(trade.orders) == 5
     last_o = trade.orders[-1]
     assert last_o.order_filled_date == datetime(2022, 10, 18, 9, 45, 22, tzinfo=timezone.utc)
+    assert isinstance(last_o.order_date, datetime)