From 33cdbc4b0e45f1ed4cb321d5e9d391b26fd287b2 Mon Sep 17 00:00:00 2001
From: Leo Werneck <leo.werneck@princeton.edu>
Date: Wed, 21 Oct 2026 09:52:17 -0400
Subject: [PATCH 1/2] Bumped cdflib to 1.3.15

---
 poetry.lock    | 8 ++++----
 pyproject.toml | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/poetry.lock b/poetry.lock
index 493953c9c7..a30b315d75 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -227,14 +227,14 @@ lxml = ["lxml"]
 
 [[package]]
 name = "cdflib"
-version = "1.3.12"
+version = "1.3.15"
 description = "A python CDF reader toolkit"
 optional = false
 python-versions = ">=3.9"
 groups = ["main"]
 files = [
-    {file = "cdflib-1.3.12-py3-none-any.whl", hash = "sha256:ef3df6e7ea918223059c7c8384802d52d9a1f655d5db677b7b8d29fd9f3d2381"},
-    {file = "cdflib-1.3.12.tar.gz", hash = "sha256:b74fbbeac4c26e7a32a4aff678c7ae249682d77898c9674654e1a038c8c2624c"},
+    {file = "cdflib-1.3.15-py3-none-any.whl", hash = "sha256:90f9b1f86bfdfc8637a8cc0f14f5545a7d83a3722579c8ba78a2a71b0d046137"},
+    {file = "cdflib-1.3.15.tar.gz", hash = "sha256:cdb71c0b280988a69c18b369eb3bd4bd9738d153acd4ed85908cbde5fc511d5f"},
 ]
 
 [package.dependencies]
@@ -3162,4 +3162,4 @@ tools = ["openpyxl", "pandas"]
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.10,<3.15"
-content-hash = "f34f41059bd79accf06652aa077c863ccf9a92543282abad9fc5252c9ee5b7fb"
+content-hash = "84b71ee1b16cc325cf0270ecce93747457ddafe0a96aa7aaa57941fc5bc95dab"
diff --git a/pyproject.toml b/pyproject.toml
index d2b784a388..72728097f9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ classifiers = [
 ]
 dependencies = [
     "astropy-healpix>=1.0",
-    "cdflib>=1.3.11",
+    "cdflib>=1.3.15",
     "imap-data-access>=1.3.0",
     "space_packet_parser>=6.0.0",
     "spiceypy>=6.0.0",

From f245513bfe785ea5cd04f53a33b269d0509ccd71 Mon Sep 17 00:00:00 2001
From: Leo Werneck <leo.werneck@princeton.edu>
Date: Wed, 21 Oct 2026 09:59:05 -0400
Subject: [PATCH 2/2] imap_processing/tests/cdf/test_utils.py: added regression
 test for CDF attributes

---
 imap_processing/tests/cdf/test_utils.py | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/imap_processing/tests/cdf/test_utils.py b/imap_processing/tests/cdf/test_utils.py
index 6482b89e26..1e2f15e5ba 100644
--- a/imap_processing/tests/cdf/test_utils.py
+++ b/imap_processing/tests/cdf/test_utils.py
@@ -2,6 +2,7 @@
 
 from unittest import mock
 
+import cdflib
 import imap_data_access
 import numpy as np
 import pandas as pd
@@ -141,6 +142,23 @@ def test_write_cdf_extra_cdf_kwargs(test_dataset):
         assert xarray_to_cdf.call_args.kwargs["compression"] == 9
 
 
+def test_write_cdf_l2_epoch_attribute_types(test_dataset):
+    """Test epoch attribute is TT2000, while epoch_delta attributes stay INT8."""
+    test_dataset.attrs["Logical_source"] = "imap_swe_l2_sci"
+    swe_attrs = ImapCdfAttributes()
+    test_dataset["epoch_delta"] = (
+        "epoch",
+        np.ones(3, dtype=np.int64),
+        swe_attrs.get_variable_attributes("epoch_delta", check_schema=False),
+    )
+    file_path = write_cdf(test_dataset, terminate_on_warning=False)
+
+    with cdflib.CDF(file_path) as cdf:
+        for att in ("FILLVAL", "VALIDMIN", "VALIDMAX"):
+            assert cdf.attget(att, "epoch").Data_Type == "CDF_TIME_TT2000"
+            assert cdf.attget(att, "epoch_delta").Data_Type == "CDF_INT8"
+
+
 def test_write_cdf_converts_extension_array(test_dataset):
     """Pass NumPy string data to cdflib without changing the input dataset."""
     test_dataset["labels"] = (