diff --git a/src/ravenpy/utilities/forecasting.py b/src/ravenpy/utilities/forecasting.py
index 84d4c10d..5b48c7dd 100644
--- a/src/ravenpy/utilities/forecasting.py
+++ b/src/ravenpy/utilities/forecasting.py
@@ -297,13 +297,14 @@ def _shift_esp_time(nc, year, dim="member"):
 
     Modify time such that it starts on the given year, and add member dimension with original year as value.
     """
-    ds = xr.open_dataset(nc, use_cftime=True)
+    ds = xr.open_dataset(nc)
 
     # Create new time coordinate
-    start = ds.time.data[0]
+    start = ds.indexes['time'][0]
     freq = xr.infer_freq(ds.time)
-    ds["time"] = xr.cftime_range(
-        start.replace(year=year), periods=len(ds.time), freq=freq
+    ds["time"] = xr.date_range(
+        start.replace(year=year), periods=len(ds.time), freq=freq,
+        calendar=ds.time.dt.calendar
     )
 
     # New coordinate dimension to store the original year