Django 1.9.2 AssertionError: database connection isn't set to UTC

Question

I have setup 3 servers now with PostgreSQL and have so far not seen this issue. I am now setting up the first server which is not running on a danish server, and i start getting errors when accessing the database from the web.

I could use createsuperuser without issues and it created my super user. But when i try to use it to login to my site i get the error.

File "/usr/lib64/python3.4/site-packages/django/db/models/sql/compiler.py",    line 1239, in cursor_iter sentinel): File "/usr/lib64/python3.4/site-packages/django/db/models/sql/compiler.py", line 1238, in <lambda> for rows in iter((lambda: cursor.fetchmany(GET_ITERATOR_CHUNK_SIZE)), File "/usr/lib64/python3.4/site-packages/django/db/utils.py", line 102, in  inner return func(*args, **kwargs) File "/usr/lib64/python3.4/site-packages/django/db/backends/postgresql/utils.py", line 6, in utc_tzinfo_factory raise AssertionError("database connection isn't set to UTC") AssertionError: database connection isn't set to UTC 

I have been looking at the code and the error comes from this code.

from django.utils.timezone import utc def utc_tzinfo_factory(offset):     if offset != 0:     raise AssertionError("database connection isn't set to UTC") return utc 

Though i cannot find where offset is initiated, so i cannot figure out how Django decides that my offset is off.

My postgresql database have timezone set to UTC and have verified all postgresql parameters written in the django documentation and i am now running out of ideas of why this happens.

I hope someone here can help?

python3.4 -V: Python 3.4.3

psql -V: psql (PostgreSQL) 9.2.15

django-admin --version: 1.9.2

UPDATED 11/8-2016 - Full Stack from DEBUG view

I found the value for the offset in the utc_tzinfo_factory, it has the value of 120. Though i cannot explain how or why it gets this value.

Below is a copy from the debug page of Django for the error with full stack and variables.

Environment:   Request Method: POST Request URL: http://myweb.dk/accounts/login/  Django Version: 1.9.2 Python Version: 3.4.3 Installed Applications: ['polls.apps.PollsConfig',  'teamTournamentApp.apps.TeamtournamentappConfig',  'django.contrib.admin',  'django.contrib.auth',  'django.contrib.contenttypes',  'django.contrib.sessions',  'django.contrib.messages',  'django.contrib.staticfiles'] Installed Middleware: ['django.middleware.security.SecurityMiddleware',  'django.contrib.sessions.middleware.SessionMiddleware',  'django.middleware.common.CommonMiddleware',  'django.middleware.csrf.CsrfViewMiddleware',  'django.contrib.auth.middleware.AuthenticationMiddleware',  'django.contrib.auth.middleware.SessionAuthenticationMiddleware',  'django.contrib.messages.middleware.MessageMiddleware',  'django.middleware.clickjacking.XFrameOptionsMiddleware']    Traceback:  File "/usr/lib64/python3.4/site-packages/django/core/handlers/base.py" in get_response   149.                     response = self.process_exception_by_middleware(e, request)  File "/usr/lib64/python3.4/site-packages/django/core/handlers/base.py" in get_response   147.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)  File "/usr/lib64/python3.4/site-packages/django/contrib/auth/views.py" in inner   49.         return func(*args, **kwargs)  File "/usr/lib64/python3.4/site-packages/django/views/decorators/debug.py" in sensitive_post_parameters_wrapper   76.             return view(request, *args, **kwargs)  File "/usr/lib64/python3.4/site-packages/django/utils/decorators.py" in _wrapped_view   149.                     response = view_func(request, *args, **kwargs)  File "/usr/lib64/python3.4/site-packages/django/views/decorators/cache.py" in _wrapped_view_func   57.         response = view_func(request, *args, **kwargs)  File "/usr/lib64/python3.4/site-packages/django/contrib/auth/views.py" in login   69.         if form.is_valid():  File "/usr/lib64/python3.4/site-packages/django/forms/forms.py" in is_valid   161.         return self.is_bound and not self.errors  File "/usr/lib64/python3.4/site-packages/django/forms/forms.py" in errors   153.             self.full_clean()  File "/usr/lib64/python3.4/site-packages/django/forms/forms.py" in full_clean   363.         self._clean_form()  File "/usr/lib64/python3.4/site-packages/django/forms/forms.py" in _clean_form   390.             cleaned_data = self.clean()  File "/usr/lib64/python3.4/site-packages/django/contrib/auth/forms.py" in clean   159.                                            password=password)  File "/usr/lib64/python3.4/site-packages/django/contrib/auth/__init__.py" in authenticate   74.             user = backend.authenticate(**credentials)  File "/usr/lib64/python3.4/site-packages/django/contrib/auth/backends.py" in authenticate   17.             user = UserModel._default_manager.get_by_natural_key(username)  File "/usr/lib64/python3.4/site-packages/django/contrib/auth/base_user.py" in get_by_natural_key   45.         return self.get(**{self.model.USERNAME_FIELD: username})  File "/usr/lib64/python3.4/site-packages/django/db/models/manager.py" in manager_method   122.                 return getattr(self.get_queryset(), name)(*args, **kwargs)  File "/usr/lib64/python3.4/site-packages/django/db/models/query.py" in get   381.         num = len(clone)  File "/usr/lib64/python3.4/site-packages/django/db/models/query.py" in __len__   240.         self._fetch_all()  File "/usr/lib64/python3.4/site-packages/django/db/models/query.py" in _fetch_all   1074.             self._result_cache = list(self.iterator())  File "/usr/lib64/python3.4/site-packages/django/db/models/query.py" in __iter__   68.         for row in compiler.results_iter(results):  File "/usr/lib64/python3.4/site-packages/django/db/models/sql/compiler.py" in results_iter   805.         for rows in results:  File "/usr/lib64/python3.4/site-packages/django/db/models/sql/compiler.py" in cursor_iter   1239.                          sentinel):  File "/usr/lib64/python3.4/site-packages/django/db/models/sql/compiler.py" in <lambda>   1238.         for rows in iter((lambda: cursor.fetchmany(GET_ITERATOR_CHUNK_SIZE)),  File "/usr/lib64/python3.4/site-packages/django/db/utils.py" in inner   102.                 return func(*args, **kwargs)  File "/usr/lib64/python3.4/site-packages/django/db/backends/postgresql/utils.py" in utc_tzinfo_factory   6.         raise AssertionError("database connection isn't set to UTC")  Exception Type: AssertionError at /accounts/login/ Exception Value: database connection isn't set to UTC  Request information  GET No GET data POST Variable    Value next     '' password     'xxxxxxx' username     'admin' csrfmiddlewaretoken  'f8E50d9kpS2j4Wlc7O9KsKtUXHxbuX58' FILES No FILES data COOKIES Variable    Value _ga  'GA1.2.1308578855.1465289038' csrftoken    'f8E50d9kpS2j4Wlc7O9KsKtUXHxbuX58' META Variable    Value UNIQUE_ID    'xxxxx' HTTP_USER_AGENT  ('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like '  'Gecko) Chrome/51.0.2704.103 Safari/537.36') mod_wsgi.total_requests  1 REMOTE_ADDR  'xx.yy.zz.tt' mod_wsgi.handler_script  '' mod_wsgi.script_name     '' HTTP_ACCEPT  'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8' REQUEST_SCHEME   'http' mod_wsgi.script_start    '1470934394985429' HTTP_REFERER     'http://myweb.dk/accounts/login/' mod_wsgi.version     (4, 5, 3) SERVER_PROTOCOL  'HTTP/1.1' HTTP_HOST    'myweb.dk' wsgi.url_scheme  'http' HTTP_ACCEPT_ENCODING     'gzip, deflate' PATH_INFO    '/accounts/login/' wsgi.multiprocess    True HTTP_CONNECTION  'keep-alive' mod_wsgi.listener_port   '80' mod_wsgi.path_info   '/accounts/login/' CONTEXT_DOCUMENT_ROOT    '/var/www/vhosts/default/htdocs' REMOTE_PORT  '59723' wsgi.errors  <_io.TextIOWrapper encoding='utf-8'> mod_wsgi.callable_object     'application' SCRIPT_NAME  '' REQUEST_URI  '/accounts/login/' SCRIPT_FILENAME  '/var/www/vhosts/myweb.dk/httpdocs/TeamTournament/TeamTournament/wsgi.py' SERVER_ADMIN     '.....' mod_wsgi.request_start   '1470934394985053' mod_wsgi.listener_host   '' mod_wsgi.enable_sendfile     '0' HTTP_UPGRADE_INSECURE_REQUESTS   '1' mod_wsgi.script_reloading    '1' SERVER_SIGNATURE     '' mod_wsgi.application_group   'myweb.dk|' mod_wsgi.thread_requests     0 wsgi.input   <mod_wsgi.Input object at 0x7f6266286920> QUERY_STRING     '' SERVER_ADDR  'xx.yy.zz.tt' wsgi.multithread     True wsgi.version     (1, 0) CONTEXT_PREFIX   '' wsgi.run_once    False REQUEST_METHOD   'POST' HTTP_ORIGIN  'http://myweb.dk' SERVER_NAME  'myweb.dk' mod_wsgi.request_handler     'wsgi-script' mod_wsgi.process_group   '' CONTENT_TYPE     'application/x-www-form-urlencoded' HTTP_CACHE_CONTROL   'max-age=0' SERVER_SOFTWARE  'Apache' HTTP_COOKIE  '_ga=GA1.2.1308578855.1465289038; csrftoken=f8E50d9kpS2j4Wlc7O9KsKtUXHxbuX58' HTTP_ACCEPT_LANGUAGE     'da-DK,da;q=0.8,en-US;q=0.6,en;q=0.4,sv;q=0.2' SERVER_PORT  '80' wsgi.file_wrapper    '' apache.version   (2, 4, 6) PATH_TRANSLATED  '/var/www/vhosts/myweb.dk/httpdocs/TeamTournament/TeamTournament/wsgi.py/accounts/login/' CONTENT_LENGTH   '91' mod_wsgi.thread_id   2 CSRF_COOKIE  'f8E50d9kpS2j4Wlc7O9KsKtUXHxbuX58' GATEWAY_INTERFACE    'CGI/1.1' DOCUMENT_ROOT    '/var/www/vhosts/default/htdocs' Settings Using settings module TeamTournament.settings Setting Value LOGIN_REDIRECT_URL   '/accounts/profile/' FILE_UPLOAD_HANDLERS     ['django.core.files.uploadhandler.MemoryFileUploadHandler',  'django.core.files.uploadhandler.TemporaryFileUploadHandler'] SECURE_SSL_HOST  None DATETIME_FORMAT  'N j, Y, P' EMAIL_HOST   'localhost' SESSION_COOKIE_PATH  '/' FORMAT_MODULE_PATH   None DEFAULT_TABLESPACE   '' DATE_INPUT_FORMATS   ['%Y-%m-%d',  '%m/%d/%Y',  '%m/%d/%y',  '%b %d %Y',  '%b %d, %Y',  '%d %b %Y',  '%d %b, %Y',  '%B %d %Y',  '%B %d, %Y',  '%d %B %Y',  '%d %B, %Y'] TEMPLATE_DIRS    [] DATETIME_INPUT_FORMATS   ['%Y-%m-%d %H:%M:%S',  '%Y-%m-%d %H:%M:%S.%f',  '%Y-%m-%d %H:%M',  '%Y-%m-%d',  '%m/%d/%Y %H:%M:%S',  '%m/%d/%Y %H:%M:%S.%f',  '%m/%d/%Y %H:%M',  '%m/%d/%Y',  '%m/%d/%y %H:%M:%S',  '%m/%d/%y %H:%M:%S.%f',  '%m/%d/%y %H:%M',  '%m/%d/%y'] FILE_UPLOAD_DIRECTORY_PERMISSIONS    None FILE_UPLOAD_MAX_MEMORY_SIZE  2621440 FIRST_DAY_OF_WEEK    0 STATICFILES_STORAGE  'django.contrib.staticfiles.storage.StaticFilesStorage' SESSION_ENGINE   'django.contrib.sessions.backends.db' TIME_FORMAT  'P' FORCE_SCRIPT_NAME    None SECURE_SSL_REDIRECT  False ALLOWED_INCLUDE_ROOTS    [] SHORT_DATETIME_FORMAT    'm/d/Y P' DEFAULT_CONTENT_TYPE     'text/html' NUMBER_GROUPING  0 DEFAULT_EXCEPTION_REPORTER_FILTER    'django.views.debug.SafeExceptionReporterFilter' SESSION_EXPIRE_AT_BROWSER_CLOSE  False LANGUAGE_CODE    'en-us' TIME_INPUT_FORMATS   ['%H:%M:%S', '%H:%M:%S.%f', '%H:%M'] SESSION_COOKIE_NAME  'sessionid' ALLOWED_HOSTS    ['xx.yy.zz.tt', 'myweb.net', 'myweb.dk'] SESSION_COOKIE_DOMAIN    None EMAIL_SSL_CERTFILE   None DEFAULT_FROM_EMAIL   'webmaster@localhost' EMAIL_PORT   25 DATE_FORMAT  'N j, Y' ABSOLUTE_URL_OVERRIDES   {} USE_ETAGS    False CSRF_FAILURE_VIEW    'django.views.csrf.csrf_failure' EMAIL_SSL_KEYFILE    '********************' CSRF_COOKIE_HTTPONLY     False SESSION_CACHE_ALIAS  'default' LANGUAGES    [('af', 'Afrikaans'),  ('ar', 'Arabic'),  ('ast', 'Asturian'),  ('az', 'Azerbaijani'),  ('bg', 'Bulgarian'),  ('be', 'Belarusian'),  ('bn', 'Bengali'),  ('br', 'Breton'),  ('bs', 'Bosnian'),  ('ca', 'Catalan'),  ('cs', 'Czech'),  ('cy', 'Welsh'),  ('da', 'Danish'),  ('de', 'German'),  ('el', 'Greek'),  ('en', 'English'),  ('en-au', 'Australian English'),  ('en-gb', 'British English'),  ('eo', 'Esperanto'),  ('es', 'Spanish'),  ('es-ar', 'Argentinian Spanish'),  ('es-co', 'Colombian Spanish'),  ('es-mx', 'Mexican Spanish'),  ('es-ni', 'Nicaraguan Spanish'),  ('es-ve', 'Venezuelan Spanish'),  ('et', 'Estonian'),  ('eu', 'Basque'),  ('fa', 'Persian'),  ('fi', 'Finnish'),  ('fr', 'French'),  ('fy', 'Frisian'),  ('ga', 'Irish'),  ('gd', 'Scottish Gaelic'),  ('gl', 'Galician'),  ('he', 'Hebrew'),  ('hi', 'Hindi'),  ('hr', 'Croatian'),  ('hu', 'Hungarian'),  ('ia', 'Interlingua'),  ('id', 'Indonesian'),  ('io', 'Ido'),  ('is', 'Icelandic'),  ('it', 'Italian'),  ('ja', 'Japanese'),  ('ka', 'Georgian'),  ('kk', 'Kazakh'),  ('km', 'Khmer'),  ('kn', 'Kannada'),  ('ko', 'Korean'),  ('lb', 'Luxembourgish'),  ('lt', 'Lithuanian'),  ('lv', 'Latvian'),  ('mk', 'Macedonian'),  ('ml', 'Malayalam'),  ('mn', 'Mongolian'),  ('mr', 'Marathi'),  ('my', 'Burmese'),  ('nb', 'Norwegian Bokmal'),  ('ne', 'Nepali'),  ('nl', 'Dutch'),  ('nn', 'Norwegian Nynorsk'),  ('os', 'Ossetic'),  ('pa', 'Punjabi'),  ('pl', 'Polish'),  ('pt', 'Portuguese'),  ('pt-br', 'Brazilian Portuguese'),  ('ro', 'Romanian'),  ('ru', 'Russian'),  ('sk', 'Slovak'),  ('sl', 'Slovenian'),  ('sq', 'Albanian'),  ('sr', 'Serbian'),  ('sr-latn', 'Serbian Latin'),  ('sv', 'Swedish'),  ('sw', 'Swahili'),  ('ta', 'Tamil'),  ('te', 'Telugu'),  ('th', 'Thai'),  ('tr', 'Turkish'),  ('tt', 'Tatar'),  ('udm', 'Udmurt'),  ('uk', 'Ukrainian'),  ('ur', 'Urdu'),  ('vi', 'Vietnamese'),  ('zh-hans', 'Simplified Chinese'),  ('zh-hant', 'Traditional Chinese')] X_FRAME_OPTIONS  'SAMEORIGIN' AUTH_USER_MODEL  'auth.User' SILENCED_SYSTEM_CHECKS   [] LOGOUT_URL   '/accounts/logout/' STATICFILES_FINDERS  ['django.contrib.staticfiles.finders.FileSystemFinder',  'django.contrib.staticfiles.finders.AppDirectoriesFinder'] TEMPLATES    [{'APP_DIRS': True,   'BACKEND': 'django.template.backends.django.DjangoTemplates',   'DIRS': ['/var/www/vhosts/myweb.dk/httpdocs/TeamTournament/templates'],   'OPTIONS': {'context_processors': ['django.template.context_processors.debug',                                      'django.template.context_processors.request',                                      'django.contrib.auth.context_processors.auth',                                      'django.contrib.messages.context_processors.messages',                                      'django.template.context_processors.request']}}] SERVER_EMAIL     'root@localhost' SECURE_BROWSER_XSS_FILTER    False TEMPLATE_CONTEXT_PROCESSORS  ['django.contrib.auth.context_processors.auth',  'django.template.context_processors.debug',  'django.template.context_processors.i18n',  'django.template.context_processors.media',  'django.template.context_processors.static',  'django.template.context_processors.tz',  'django.contrib.messages.context_processors.messages'] DEBUG_APPS   False USE_X_FORWARDED_PORT     False ADMINS   [] SIGNING_BACKEND  'django.core.signing.TimestampSigner' CSRF_COOKIE_SECURE   False EMAIL_USE_SSL    False CACHES   {'default': {'BACKEND': 'django.core.cache.backends.locmem.LocMemCache'}} LOCALE_PATHS     [] TEMPLATE_STRING_IF_INVALID   '' MESSAGE_STORAGE  'django.contrib.messages.storage.fallback.FallbackStorage' PRODUCTION   False FIXTURE_DIRS     [] CSRF_COOKIE_PATH     '/' MIDDLEWARE_CLASSES   ['django.middleware.security.SecurityMiddleware',  'django.contrib.sessions.middleware.SessionMiddleware',  'django.middleware.common.CommonMiddleware',  'django.middleware.csrf.CsrfViewMiddleware',  'django.contrib.auth.middleware.AuthenticationMiddleware',  'django.contrib.auth.middleware.SessionAuthenticationMiddleware',  'django.contrib.messages.middleware.MessageMiddleware',  'django.middleware.clickjacking.XFrameOptionsMiddleware'] MANAGERS     [] CSRF_TRUSTED_ORIGINS     [] CACHE_MIDDLEWARE_SECONDS     600 APPEND_SLASH     True TEST_NON_SERIALIZED_APPS     [] SECURE_HSTS_INCLUDE_SUBDOMAINS   False MIGRATION_MODULES    {} LANGUAGE_COOKIE_AGE  None TEMPLATE_LOADERS     ['django.template.loaders.filesystem.Loader',  'django.template.loaders.app_directories.Loader'] STATIC_URL   '/static/' SESSION_COOKIE_AGE   1209600 SETTINGS_MODULE  'TeamTournament.settings' DECIMAL_SEPARATOR    '.' YEAR_MONTH_FORMAT    'F Y' EMAIL_TIMEOUT    None SESSION_SAVE_EVERY_REQUEST   False BASE_DIR     '/var/www/vhosts/myweb.dk/httpdocs/TeamTournament' SECURE_CONTENT_TYPE_NOSNIFF  False FILE_UPLOAD_TEMP_DIR     None CACHE_MIDDLEWARE_KEY_PREFIX  '********************' DEBUG    True SESSION_COOKIE_HTTPONLY  True CSRF_HEADER_NAME     'HTTP_X_CSRFTOKEN' USE_L10N     True STATICFILES_DIRS     [] SESSION_SERIALIZER   'django.contrib.sessions.serializers.JSONSerializer' USE_THOUSAND_SEPARATOR   False EMAIL_BACKEND    'django.core.mail.backends.smtp.EmailBackend' USE_X_FORWARDED_HOST     False STATIC_ROOT  '/var/www/vhosts/myweb.dk/httpdocs/static/' SECRET_KEY   '********************' PASSWORD_RESET_TIMEOUT_DAYS  '********************' MEDIA_ROOT   '' TIME_ZONE    'CET' DATABASES    {'default': {'ATOMIC_REQUESTS': False,              'AUTOCOMMIT': True,              'CONN_MAX_AGE': 0,              'ENGINE': 'django.db.backends.postgresql',              'HOST': '127.0.0.1',              'NAME': 'user',              'OPTIONS': {},              'PASSWORD': '********************',              'PORT': '5432',              'TEST': {'CHARSET': None,                       'COLLATION': None,                       'MIRROR': None,                       'NAME': None},              'TIME_ZONE': None,              'USER': 'user'}} DEFAULT_INDEX_TABLESPACE     '' EMAIL_USE_TLS    False LOGIN_URL    '/accounts/login/' SHORT_DATE_FORMAT    'm/d/Y' CSRF_COOKIE_NAME     'csrftoken' LANGUAGE_COOKIE_DOMAIN   None USE_I18N     True SESSION_COOKIE_SECURE    False CACHE_MIDDLEWARE_ALIAS   'default' DEFAULT_CHARSET  'utf-8' TEMPLATE_DEBUG   False ROOT_URLCONF     'TeamTournament.urls' SECURE_PROXY_SSL_HEADER  None EMAIL_HOST_PASSWORD  '********************' FILE_UPLOAD_PERMISSIONS  None CSRF_COOKIE_AGE  31449600 DEBUG_PROPAGATE_EXCEPTIONS   False WSGI_APPLICATION     'TeamTournament.wsgi.application' PASSWORD_HASHERS     '********************' SECURE_REDIRECT_EXEMPT   [] LANGUAGES_BIDI   ['he', 'ar', 'fa', 'ur'] CSRF_COOKIE_DOMAIN   None DEFAULT_FILE_STORAGE     'django.core.files.storage.FileSystemStorage' POSTGRES     True PREPEND_WWW  False EMAIL_SUBJECT_PREFIX     '[Django] ' LOGGING  {'disable_existing_loggers': False,  'filters': {'require_debug_false': {'()': 'django.utils.log.RequireDebugFalse'}},  'handlers': {'logfile': {'class': 'logging.handlers.WatchedFileHandler',                           'filename': '/var/log/django/error.log'},               'mail_admins': {'class': 'django.utils.log.AdminEmailHandler',                               'filters': ['require_debug_false'],                               'level': 'ERROR'}},  'loggers': {'django': {'handlers': ['logfile'],                         'level': 'ERROR',                         'propagate': False},              'django.request': {'handlers': ['mail_admins'],                                 'level': 'ERROR',                                 'propagate': True}},  'version': 1} SESSION_FILE_PATH    None TEST_RUNNER  'django.test.runner.DiscoverRunner' INTERNAL_IPS     [] DATABASE_ROUTERS     [] FILE_CHARSET     'utf-8' LANGUAGE_COOKIE_NAME     'django_language' INSTALLED_APPS   ['polls.apps.PollsConfig',  'teamTournamentApp.apps.TeamtournamentappConfig',  'django.contrib.admin',  'django.contrib.auth',  'django.contrib.contenttypes',  'django.contrib.sessions',  'django.contrib.messages',  'django.contrib.staticfiles'] LANGUAGE_COOKIE_PATH     '/' IGNORABLE_404_URLS   [] MEDIA_URL    '' DISALLOWED_USER_AGENTS   [] LOG_PATH     '/var/log/django/error.log' LOGGING_CONFIG   'logging.config.dictConfig' THOUSAND_SEPARATOR   ',' MONTH_DAY_FORMAT     'F j' USE_TZ   True EMAIL_HOST_USER  '' AUTH_PASSWORD_VALIDATORS     '********************' SECURE_HSTS_SECONDS  0 AUTHENTICATION_BACKENDS  ['django.contrib.auth.backends.ModelBackend'] 

Answer 1

For 18/06/2021 this is a known issue, which comes from the psycopg-2/psycopg2-binary packages. Fortunately, they already have an open issue on their GitHub page, so hopefully it gets fixed soon.

As a temporary fix, you can pin the version in your requirements.txt to psycopg2-binary>=2.8,<2.9 or psycopg2>=2.8,<2.9, depending on what package you are using.

Thanks to @vinkomlacic for mentioning this in comments.

Answer 2

I encountered this same problem, also with a server that is normally running with the UTC+2 (in my case, Europe/Oslo).

It turned out that the system zoneinfo files on my server (Centos 7) were corrupted, which became evident in pg_timezone_names.

postgres=# select * from pg_timezone_names where name like 'UTC';  name | abbrev | utc_offset | is_dst ------+--------+------------+--------  UTC  | CEST   | 02:00:00   | t (1 row) 

After running yum update tzdata to update my server's timezone files, and restarting the PostgreSQL server, the issue appears to be resolved.

postgres=# select * from pg_timezone_names where name like 'UTC';  name | abbrev | utc_offset | is_dst ------+--------+------------+--------  UTC  | UTC    | 00:00:00   | f (1 row) 

My guess it that I might previously have run cat /usr/share/zoneinfo/Europe/Oslo > /etc/localtime without first removing /etc/localtime to change the timezone on the system, effectively overwriting the zoneinfo for UTC with the zoneinfo for Europe/Oslo.