avoid deprecated utcnow

Author: weaverba137

.github/workflows/ci_workflows.yml

@@ -40,12 +40,12 @@ jobs:
           - name: Python 3.12 (Windows)
             os: windows-latest
             python: '3.12'
-            toxenv: py311-test
+            toxenv: py312-test
 
           - name: Python 3.10 (MacOS X)
             os: macos-latest
             python: '3.10'
-            toxenv: py311-test
+            toxenv: py310-test
 
           - name: Python 3.10
             os: ubuntu-latest
@@ -55,7 +55,7 @@ jobs:
           - name: Python 3.10 with oldest supported version of key dependencies
             os: ubuntu-22.04
             python: '3.10'
-            toxenv: py38-test-oldestdeps
+            toxenv: py310-test-oldestdeps
 
     steps:
     - name: Checkout code
@@ -66,11 +66,11 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python }}
-    # - name: Install language-pack-de and tzdata
-    #   if: startsWith(matrix.os, 'ubuntu')
-    #   run: |
-    #       sudo apt-get update
-    #       sudo apt-get install language-pack-de tzdata graphviz
+    - name: Install language-pack-de and tzdata
+      if: startsWith(matrix.os, 'ubuntu')
+      run: |
+          sudo apt-get update
+          sudo apt-get install graphviz
     - name: Install Python dependencies
       run: python -m pip install --upgrade tox
     - name: Run tests

pydl/pydlutils/yanny.py

@@ -865,7 +865,7 @@ def write(self, newfile=None, comments=None):
                   "{0} exists, aborting write!".format(newfile))
         if comments is None:
             basefile = os.path.basename(newfile)
-            timestamp = datetime.datetime.utcnow().strftime('%Y-%m-%d %H:%M:%S UTC')
+            timestamp = datetime.datetime.now(datetime.UTC).strftime('%Y-%m-%d %H:%M:%S UTC')
             comments = f"""#
 # {basefile}
 #
@@ -947,7 +947,7 @@ def append(self, datatable):
         if not isinstance(datatable, dict):
             raise ValueError("Data to append is not of the correct type. " +
                              "Use a dict!")
-        timestamp = datetime.datetime.utcnow().strftime('%Y-%m-%d %H:%M:%S UTC')
+        timestamp = datetime.datetime.now(datetime.UTC).strftime('%Y-%m-%d %H:%M:%S UTC')
         contents = ''
         #
         # Print any key/value pairs