fix date formatting for non-English locales

bottle.py

@@ -69,8 +69,8 @@ def _cli_patch(cli_args):  # pragma: no coverage
 ###############################################################################
 
 
-import base64, cgi, email.utils, functools, hmac, imp, itertools, mimetypes,\
-        os, re, tempfile, threading, time, warnings, weakref, hashlib
+import base64, calendar, cgi, email.utils, functools, hmac, imp, itertools,\
+       mimetypes, os, re, tempfile, threading, time, warnings, weakref, hashlib
 
 from types import FunctionType
 from datetime import date as datedate, datetime, timedelta
@@ -1887,11 +1887,7 @@ def set_cookie(self, name, value, secret=None, digestmod=hashlib.sha256, **optio
                 if isinstance(value, timedelta):
                     value = value.seconds + value.days * 24 * 3600
             if key == 'expires':
-                if isinstance(value, (datedate, datetime)):
-                    value = value.timetuple()
-                elif isinstance(value, (int, float)):
-                    value = time.gmtime(value)
-                value = time.strftime("%a, %d %b %Y %H:%M:%S GMT", value)
+                value = http_date(value)
             if key in ('same_site', 'samesite'): # 'samesite' variant added in 0.13
                 key, value = 'samesite', (value or "none").lower()
                 if value not in ('lax', 'strict', 'none'):
@@ -2965,13 +2961,19 @@ def debug(mode=True):
 
 
 def http_date(value):
-    if isinstance(value, (datedate, datetime)):
+    if isinstance(value, basestring):
+        return value
+    if isinstance(value, datetime):
+        # aware datetime.datetime is converted to UTC time
+        # naive datetime.datetime is treated as UTC time
         value = value.utctimetuple()
-    elif isinstance(value, (int, float)):
-        value = time.gmtime(value)
-    if not isinstance(value, basestring):
-        value = time.strftime("%a, %d %b %Y %H:%M:%S GMT", value)
-    return value
+    elif isinstance(value, datedate):
+        # datetime.date is naive, and is treated as UTC time
+        value = value.timetuple()
+    if not isinstance(value, (int, float)):
+        # convert struct_time in UTC to UNIX timestamp
+        value = calendar.timegm(value)
+    return email.utils.formatdate(value, usegmt=True)
 
 
 def parse_date(ims):

test/test_sendfile.py

@@ -13,23 +13,29 @@
 root2 = os.path.dirname(bottle.__file__)
 
 
+weekday_full = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']
+weekday_abbr = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
+month_abbr = [None, 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
+
 class TestDateParser(unittest.TestCase):
     def test_rfc1123(self):
         """DateParser: RFC 1123 format"""
         ts = time.time()
-        rs = time.strftime("%a, %d %b %Y %H:%M:%S GMT", time.gmtime(ts))
+        rs = bottle.http_date(ts)
         self.assertEqual(int(ts), int(parse_date(rs)))
 
     def test_rfc850(self):
         """DateParser: RFC 850 format"""
         ts = time.time()
-        rs = time.strftime("%A, %d-%b-%y %H:%M:%S GMT", time.gmtime(ts))
+        t = time.gmtime(ts)
+        rs = time.strftime("%%s, %d-%%s-%y %H:%M:%S GMT", t) % (weekday_full[t.tm_wday], month_abbr[t.tm_mon])
         self.assertEqual(int(ts), int(parse_date(rs)))
 
     def test_asctime(self):
         """DateParser: asctime format"""
         ts = time.time()
-        rs = time.strftime("%a %b %d %H:%M:%S %Y", time.gmtime(ts))
+        t = time.gmtime(ts)
+        rs = time.strftime("%%s %%s %d %H:%M:%S %Y", t) % (weekday_abbr[t.tm_wday], month_abbr[t.tm_mon])
         self.assertEqual(int(ts), int(parse_date(rs)))
 
     def test_bad(self):
@@ -81,12 +87,12 @@ def test_mime(self):
 
     def test_ims(self):
         """ SendFile: If-Modified-Since"""
-        request.environ['HTTP_IF_MODIFIED_SINCE'] = time.strftime("%a, %d %b %Y %H:%M:%S GMT", time.gmtime())
+        request.environ['HTTP_IF_MODIFIED_SINCE'] = bottle.http_date(time.time())
         res = static_file(basename, root=root)
         self.assertEqual(304, res.status_code)
         self.assertEqual(int(os.stat(__file__).st_mtime), parse_date(res.headers['Last-Modified']))
         self.assertAlmostEqual(int(time.time()), parse_date(res.headers['Date']))
-        request.environ['HTTP_IF_MODIFIED_SINCE'] = time.strftime("%a, %d %b %Y %H:%M:%S GMT", time.gmtime(100))
+        request.environ['HTTP_IF_MODIFIED_SINCE'] = bottle.http_date(100)
         self.assertEqual(open(__file__,'rb').read(), static_file(basename, root=root).body.read())
 
     def test_etag(self):
@@ -116,7 +122,7 @@ def test_download(self):
 
         f = static_file(basename, root=root, download=True)
         self.assertEqual('attachment; filename="%s"' % basename, f.headers['Content-Disposition'])
-        request.environ['HTTP_IF_MODIFIED_SINCE'] = time.strftime("%a, %d %b %Y %H:%M:%S GMT", time.gmtime(100))
+        request.environ['HTTP_IF_MODIFIED_SINCE'] = bottle.http_date(100)
 
         f = static_file(basename, root=root)
         self.assertEqual(open(__file__,'rb').read(), f.body.read())