small fix

src/herd_db.erl

@@ -32,7 +32,7 @@ epgsql_value_to_json(_Type, Value) when is_atom(Value);
                                         is_binary(Value)
                                         -> Value;
 epgsql_value_to_json(time, {H, M, S}) -> H * 3600 + M * 60 + trunc(S);
-epgsql_value_to_json(date, Date) -> epgsql_value_to_json(timestamp, {Date, {0, 0, 0}});
+epgsql_value_to_json(date, Date) -> epgsql_value_to_json(timestamp, {Date, {0, 0, 0.0}});
 epgsql_value_to_json(timestamp, Timestamp) -> epgsql_value_to_json(timestamptz, Timestamp);
 epgsql_value_to_json(timestamptz, Timestamp) ->
     herd_datetime:datetime_to_timestamp(