diff --git a/src/_py/utils.rs b/src/_py/utils.rs
index 1799f1a..45c24f2 100644
--- a/src/_py/utils.rs
+++ b/src/_py/utils.rs
@@ -5,18 +5,31 @@ use pyo3_polars::{PyDataFrame, PySeries};
 #[allow(deprecated)]
 #[pymodule]
 pub fn utils(_py: Python, m: &PyModule) -> PyResult<()> {
-    m.add_function(wrap_pyfunction!(get_bdates_series_default, m)?)?;
+    m.add_function(wrap_pyfunction!(get_bdates_series_default_pl, m)?)?;
+    m.add_function(wrap_pyfunction!(get_bdates_series_default_opt, m)?)?;
     Ok(())
 }
 
 #[pyfunction]
-pub fn get_bdates_series_default(
+pub fn get_bdates_series_default_pl(
     start_date: String,
     end_date: String,
     freq: Option<String>,
 ) -> PyResult<PySeries> {
     Ok(PySeries(
-        crate::utils::dateutils::get_bdates_series_default(start_date, end_date, freq)
+        crate::utils::dateutils::get_bdates_series_default_pl(start_date, end_date, freq)
+            .map_err(|e| PyErr::new::<pyo3::exceptions::PyValueError, _>(format!("{}", e)))?,
+    ))
+}
+
+#[pyfunction]
+pub fn get_bdates_series_default_opt(
+    start_date: String,
+    end_date: String,
+    freq: Option<String>,
+) -> PyResult<PySeries> {
+    Ok(PySeries(
+        crate::utils::dateutils::get_bdates_series_default_opt(start_date, end_date, freq)
             .map_err(|e| PyErr::new::<pyo3::exceptions::PyValueError, _>(format!("{}", e)))?,
     ))
 }