diff --git a/waternsw_grabber/waternsw_grabber.py b/waternsw_grabber/waternsw_grabber.py
index 7865cfc..3676bf6 100644
--- a/waternsw_grabber/waternsw_grabber.py
+++ b/waternsw_grabber/waternsw_grabber.py
@@ -148,9 +148,21 @@ def get_telemetered_bore(driver, bore_id, start_date, end_date):
     # Get date input fields
     fields = driver.find_elements_by_xpath('//*[starts-with(@id,"cdate")]')
 
-    # Parse dates
-    start_date = pd.to_datetime(start_date)
-    end_date = pd.to_datetime(end_date)
+    # Get available date ranges
+    datestr = driver.find_elements_by_xpath('//*/tr/td[4]/span')
+    dates = np.array([d.text.split(' to ') for d in datestr])
+
+    if start_date is not None:
+        start_date = pd.to_datetime(start_date)
+    else:
+        # Get date from page, if not provided
+        start_date = pd.to_datetime(dates[:, 0], dayfirst=True).min()
+
+    if end_date is not None:
+        end_date = pd.to_datetime(end_date)
+    else:
+        # Get date from page, if not provided
+        end_date = pd.to_datetime(dates[:, 1], dayfirst=True).max()
 
     # Update fields with specified dates
     for field, date in zip(fields, [start_date, end_date]):