Fix leap second update when using a non english locale

.github/workflows/ci_workflows.yml

@@ -68,9 +68,9 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python }}
-    - name: Install language-pack-de and tzdata
+    - name: Install language-pack-fr and tzdata
       if: startsWith(matrix.os, 'ubuntu')
-      run: sudo apt-get install language-pack-de tzdata
+      run: sudo apt-get install language-pack-fr tzdata
     - name: Install Python dependencies
       run: python -m pip install --upgrade tox codecov
     - name: Run tests

CHANGES.rst

@@ -1110,6 +1110,8 @@ astropy.tests
 astropy.time
 ^^^^^^^^^^^^
 
+- Fix leap second update when using a non english locale. [#11062]
+
 astropy.timeseries
 ^^^^^^^^^^^^^^^^^^
 

astropy/io/ascii/tests/test_read.py

@@ -1290,9 +1290,9 @@ def test_non_C_locale_with_fast_reader():
 
     try:
         if platform.system() == 'Darwin':
-            locale.setlocale(locale.LC_ALL, 'de_DE')
+            locale.setlocale(locale.LC_ALL, 'fr_FR')
         else:
-            locale.setlocale(locale.LC_ALL, 'de_DE.utf8')
+            locale.setlocale(locale.LC_ALL, 'fr_FR.utf8')
 
         for fast_reader in (True,
                             False,

astropy/utils/iers/iers.py

@@ -76,6 +76,9 @@
   conf.auto_max_age = None
 """
 
+MONTH_ABBR = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug',
+              'Sep', 'Oct', 'Nov', 'Dec']
+
 
 def download_file(*args, **kwargs):
     """
@@ -1031,9 +1034,10 @@ def _read_leap_seconds(cls, file, **kwargs):
             for line in lines:
                 match = cls._re_expires.match(line)
                 if match:
-                    expires = Time.strptime(match.groups()[0], '%d %B %Y',
-                                            scale='tai', format='iso',
-                                            out_subfmt='date')
+                    day, month, year = match.groups()[0].split()
+                    month_nb = MONTH_ABBR.index(month[:3]) + 1
+                    expires = Time(f'{year}-{month_nb:02d}-{day}',
+                                   scale='tai', out_subfmt='date')
                     break
             else:
                 raise ValueError(f'did not find expiration date in {file}')

astropy/utils/iers/tests/test_leap_second.py

@@ -1,6 +1,8 @@
 # Licensed under a 3-clause BSD style license - see LICENSE.rst
 import urllib.request
 import os
+import locale
+import platform
 
 import pytest
 import numpy as np
@@ -48,6 +50,24 @@ def test_read_leap_second_dat(self):
         assert ls['tai_utc'][-1] >= 37
         self.verify_day_month_year(ls)
 
+    def test_read_leap_second_dat_locale(self):
+        current = locale.setlocale(locale.LC_ALL)
+        try:
+            if platform.system() == 'Darwin':
+                locale.setlocale(locale.LC_ALL, 'fr_FR')
+            else:
+                locale.setlocale(locale.LC_ALL, 'fr_FR.utf8')
+
+            ls = iers.LeapSeconds.from_iers_leap_seconds(
+                iers.IERS_LEAP_SECOND_FILE)
+        except locale.Error as e:
+            pytest.skip(f'Locale error: {e}')
+        finally:
+            locale.setlocale(locale.LC_ALL, current)
+
+        # Below, >= to take into account we might ship and updated file.
+        assert ls.expires >= Time('2020-06-28', scale='tai')
+
     def test_open_leap_second_dat(self):
         ls = iers.LeapSeconds.from_iers_leap_seconds(
             iers.IERS_LEAP_SECOND_FILE)

astropy/utils/tests/test_misc.py

@@ -89,8 +89,8 @@ def test_set_locale():
     # First, test if the required locales are available
     current = locale.setlocale(locale.LC_ALL)
     try:
-        locale.setlocale(locale.LC_ALL, 'en_US')
-        locale.setlocale(locale.LC_ALL, 'de_DE')
+        locale.setlocale(locale.LC_ALL, 'en_US.utf8')
+        locale.setlocale(locale.LC_ALL, 'fr_FR.utf8')
     except locale.Error as e:
         pytest.skip(f'Locale error: {e}')
     finally:
@@ -99,11 +99,11 @@ def test_set_locale():
     date = datetime(2000, 10, 1, 0, 0, 0)
     day_mon = date.strftime('%a, %b')
 
-    with misc._set_locale('en_US'):
+    with misc._set_locale('en_US.utf8'):
         assert date.strftime('%a, %b') == 'Sun, Oct'
 
-    with misc._set_locale('de_DE'):
-        assert date.strftime('%a, %b') == 'So, Okt'
+    with misc._set_locale('fr_FR.utf8'):
+        assert date.strftime('%a, %b') == 'dim., oct.'
 
     # Back to original
     assert date.strftime('%a, %b') == day_mon