diff --git a/docs/whats_new.md b/docs/whats_new.md
index 2a38359..0739206 100644
--- a/docs/whats_new.md
+++ b/docs/whats_new.md
@@ -1,5 +1,9 @@
 # What's New
 
+## Unreleased
+
+* Suffix for parquet file format is now ".parquet" instead of ".parq".
+
 ## v0.11.1 (February 4, 2025)
 
 * Move known model hard-wired model times into the class so they are refreshed each time the library is read.
diff --git a/particle_tracking_manager/the_manager.py b/particle_tracking_manager/the_manager.py
index 712eadb..0aac27b 100644
--- a/particle_tracking_manager/the_manager.py
+++ b/particle_tracking_manager/the_manager.py
@@ -213,7 +213,7 @@ def __init__(
             2021, 8, 31, 19, 0, 0
         )
         self.__dict__["ciofs_operational_end_time"] = (
-            pd.Timestamp.now() + pd.Timedelta("48H")
+            pd.Timestamp.now() + pd.Timedelta("48h")
         ).to_pydatetime()
         self.__dict__["ciofs_end_time"] = datetime.datetime(2023, 1, 1, 0, 0, 0)
         self.__dict__["nwgoa_end_time"] = datetime.datetime(2009, 1, 1, 0, 0, 0)
@@ -253,7 +253,9 @@ def __init__(
             output_file = f"output-results_{datetime.datetime.now():%Y-%m-%dT%H%M:%SZ}"
 
         # want output_file to not include any suffix
-        output_file = output_file.rstrip(".nc").rstrip(".parq")
+        output_file = (
+            output_file.replace(".nc", "").replace(".parquet", "").replace(".parq", "")
+        )
 
         ## set up log for this simulation
         # Create a file handler
@@ -476,7 +478,7 @@ def __setattr__(self, name: str, value) -> None:
                         output_file = str(pathlib.Path(output_file).with_suffix(".nc"))
                     elif self.output_format == "parquet":
                         output_file = str(
-                            pathlib.Path(output_file).with_suffix(".parq")
+                            pathlib.Path(output_file).with_suffix(".parquet")
                         )
                     else:
                         raise ValueError(
diff --git a/tests/test_manager.py b/tests/test_manager.py
index 964e1d2..f96646b 100644
--- a/tests/test_manager.py
+++ b/tests/test_manager.py
@@ -405,6 +405,9 @@ def test_log_name():
     m = ptm.OpenDriftModel(output_file="newtest.parq")
     assert m.logfile_name == "newtest.log"
 
+    m = ptm.OpenDriftModel(output_file="newtest.parquet")
+    assert m.logfile_name == "newtest.log"
+
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/tests/test_opendrift.py b/tests/test_opendrift.py
index 909a2b0..bc17452 100644
--- a/tests/test_opendrift.py
+++ b/tests/test_opendrift.py
@@ -326,7 +326,7 @@ def test_output_file():
     """make sure output file is parquet if output_format is parquet"""
 
     m = OpenDriftModel(output_format="parquet")
-    assert m.output_file.endswith(".parq")
+    assert m.output_file.endswith(".parquet")
 
     m = OpenDriftModel(output_format="netcdf")
     assert m.output_file.endswith(".nc")