datetime-local input fields are transformed in UTC server-side

2023-05-29 20:16:59 +02:00 · 2023-05-29 20:16:59 +02:00 · c7f23e845c
commit c7f23e845c
parent f112583b09
12 changed files with 316 additions and 168 deletions
--- a/CHANGES.rst
+++ b/CHANGES.rst
@ -8,6 +8,7 @@ Added

 - Implemented account expiration based on OpenLDAP ppolicy overlay. Needs OpenLDAP 2.5+
  :issue:`13` :pr:`118`
+- Timezone configuration entry. :issue:`137` :pr:`130`

 Fixed
 *****
--- a/canaille/app/forms.py
+++ b/canaille/app/forms.py
@ -1,8 +1,11 @@
+import datetime
 import math

+import pytz
 import wtforms
 from canaille.app.i18n import DEFAULT_LANGUAGE_CODE
 from canaille.app.i18n import locale_selector
+from canaille.app.i18n import timezone_selector
 from flask import abort
 from flask import current_app
 from flask import make_response
@ -81,3 +84,31 @@ class TableForm(I18NFormMixin, FlaskForm):
    def validate_page(self, field):
        if field.data < 1 or field.data > self.page_max:
            raise wtforms.validators.ValidationError(_("The page number is not valid"))
+
+
+class DateTimeUTCField(wtforms.DateTimeLocalField):
+    def _value(self):
+        if not self.data:
+            return ""
+
+        user_timezone = timezone_selector()
+        locale_dt = self.data.astimezone(user_timezone)
+        return locale_dt.strftime(self.format[0])
+
+    def process_formdata(self, valuelist):
+        if not valuelist:
+            return
+
+        date_str = " ".join(valuelist)
+        user_timezone = timezone_selector()
+        for format in self.strptime_format:
+            try:
+                unaware_dt = datetime.datetime.strptime(date_str, format)
+                locale_dt = user_timezone.localize(unaware_dt)
+                utc_dt = locale_dt.astimezone(pytz.utc)
+                self.data = utc_dt
+                return
+            except ValueError:
+                self.data = None
+
+        raise ValueError(self.gettext("Not a valid datetime value."))
--- a/canaille/app/i18n.py
+++ b/canaille/app/i18n.py
@ -1,6 +1,8 @@
 import gettext

 import pycountry
+import pytz
+from babel.dates import LOCALTZ
 from flask import current_app
 from flask import g
 from flask import request
@ -13,7 +15,9 @@ babel = Babel()


 def setup_i18n(app):
-    babel.init_app(app, locale_selector=locale_selector)
+    babel.init_app(
+        app, locale_selector=locale_selector, timezone_selector=timezone_selector
+    )

    @app.before_request
    def before_request():
@ -40,6 +44,13 @@ def locale_selector():
    return request.accept_languages.best_match(available_language_codes)


+def timezone_selector():
+    try:
+        return pytz.timezone(current_app.config.get("TIMEZONE"))
+    except pytz.exceptions.UnknownTimeZoneError:
+        return LOCALTZ
+
+
 def native_language_name_from_code(code):
    language = pycountry.languages.get(alpha_2=code[:2])
    if code == DEFAULT_LANGUAGE_CODE:
--- a/canaille/conf/config.sample.toml
+++ b/canaille/conf/config.sample.toml
@ -25,6 +25,10 @@ SECRET_KEY = "change me before you go in production"
 # If unset, language is detected
 # LANGUAGE = "en"

+# The timezone in which datetimes will be displayed to the users.
+# If unset, the server timezone will be used.
+# TIMEZONE = UTC
+
 # If you have a sentry instance, you can set its dsn here:
 # SENTRY_DSN = "https://examplePublicKey@o0.ingest.sentry.io/0"

--- a/canaille/core/forms.py
+++ b/canaille/core/forms.py
@ -1,5 +1,6 @@
 import wtforms.form
 from canaille.app import models
+from canaille.app.forms import DateTimeUTCField
 from canaille.app.forms import HTMXBaseForm
 from canaille.app.forms import HTMXForm
 from canaille.app.forms import is_uri
@ -286,7 +287,7 @@ def profile_form(write_field_names, readonly_field_names, user=None):
        del fields["groups"]

    if current_app.backend.get().has_account_lockability():  # pragma: no branch
-        fields["lock_date"] = wtforms.DateTimeLocalField(
+        fields["lock_date"] = DateTimeUTCField(
            _("Account expiration"),
            validators=[wtforms.validators.Optional()],
            format=[
--- a/demo/conf-docker/canaille.toml
+++ b/demo/conf-docker/canaille.toml
@ -25,6 +25,10 @@ FAVICON = "/static/img/canaille-c.png"
 # If unset, language is detected
 # LANGUAGE = "en"

+# The timezone in which datetimes will be displayed to the users.
+# If unset, the server timezone will be used.
+# TIMEZONE = UTC
+
 # If you have a sentry instance, you can set its dsn here:
 # SENTRY_DSN = "https://examplePublicKey@o0.ingest.sentry.io/0"

--- a/demo/conf/canaille.toml
+++ b/demo/conf/canaille.toml
@ -25,6 +25,10 @@ FAVICON = "/static/img/canaille-c.png"
 # If unset, language is detected
 # LANGUAGE = "en"

+# The timezone in which datetimes will be displayed to the users.
+# If unset, the server timezone will be used.
+# TIMEZONE = UTC
+
 # If you have a sentry instance, you can set its dsn here:
 # SENTRY_DSN = "https://examplePublicKey@o0.ingest.sentry.io/0"

--- a/doc/configuration.rst
+++ b/doc/configuration.rst
@ -34,6 +34,9 @@ Canaille is based on Flask, so any `flask configuration <https://flask.palletspr
 :LANGUAGE:
    *Optional.* The locale code of the language to use. If not set, the language of the browser will be used.

+:TIMEZONE:
+    *Optional.* The timezone in which datetimes will be displayed to the users. If unset, the server timezone will be used.
+
 :SENTRY_DSN:
    *Optional.* A DSN to a sentry instance.
    This needs the ``sentry_sdk`` python package to be installed.
--- a/poetry.lock
+++ b/poetry.lock
@ -1,10 +1,9 @@
-# This file is automatically @generated by Poetry 1.4.2 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.5.0 and should not be changed by hand.

 [[package]]
 name = "aiosmtpd"
 version = "1.4.4.post2"
 description = "aiosmtpd - asyncio based SMTP server"
-category = "dev"
 optional = false
 python-versions = "~=3.7"
 files = [
@ -21,7 +20,6 @@ typing-extensions = {version = "*", markers = "python_version < \"3.8\""}
 name = "alabaster"
 version = "0.7.13"
 description = "A configurable sidebar-enabled Sphinx theme"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@ -33,7 +31,6 @@ files = [
 name = "atpublic"
 version = "3.1.1"
 description = "Keep all y'all's __all__'s in sync"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -45,7 +42,6 @@ files = [
 name = "attrs"
 version = "23.1.0"
 description = "Classes Without Boilerplate"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -67,7 +63,6 @@ tests-no-zope = ["cloudpickle", "hypothesis", "mypy (>=1.1.1)", "pympler", "pyte
 name = "authlib"
 version = "1.2.0"
 description = "The ultimate Python library in building OAuth and OpenID Connect servers and clients."
-category = "main"
 optional = false
 python-versions = "*"
 files = [
@ -82,7 +77,6 @@ cryptography = ">=3.2"
 name = "babel"
 version = "2.12.1"
 description = "Internationalization utilities"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -97,7 +91,6 @@ pytz = {version = ">=2015.7", markers = "python_version < \"3.9\""}
 name = "beautifulsoup4"
 version = "4.12.2"
 description = "Screen-scraping library"
-category = "dev"
 optional = false
 python-versions = ">=3.6.0"
 files = [
@ -116,7 +109,6 @@ lxml = ["lxml"]
 name = "blinker"
 version = "1.6.2"
 description = "Fast, simple object-to-object and broadcast signaling"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -128,7 +120,6 @@ files = [
 name = "certifi"
 version = "2023.5.7"
 description = "Python package for providing Mozilla's CA Bundle."
-category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
@ -140,7 +131,6 @@ files = [
 name = "cffi"
 version = "1.15.1"
 description = "Foreign Function Interface for Python calling C code."
-category = "main"
 optional = false
 python-versions = "*"
 files = [
@ -217,7 +207,6 @@ pycparser = "*"
 name = "cfgv"
 version = "3.3.1"
 description = "Validate configuration and produce human readable error messages."
-category = "dev"
 optional = false
 python-versions = ">=3.6.1"
 files = [
@ -229,7 +218,6 @@ files = [
 name = "charset-normalizer"
 version = "3.1.0"
 description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
-category = "dev"
 optional = false
 python-versions = ">=3.7.0"
 files = [
@ -314,7 +302,6 @@ files = [
 name = "click"
 version = "8.1.3"
 description = "Composable command line interface toolkit"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -330,7 +317,6 @@ importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 name = "colorama"
 version = "0.4.6"
 description = "Cross-platform colored terminal text."
-category = "main"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
 files = [
@ -340,63 +326,62 @@ files = [

 [[package]]
 name = "coverage"
-version = "7.2.5"
+version = "7.2.6"
 description = "Code coverage measurement for Python"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
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 ]

 [package.dependencies]
@ -409,7 +394,6 @@ toml = ["tomli"]
 name = "cryptography"
 version = "39.0.2"
 description = "cryptography is a package which provides cryptographic recipes and primitives to Python developers."
-category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
@ -455,7 +439,6 @@ tox = ["tox"]
 name = "cryptography"
 version = "40.0.2"
 description = "cryptography is a package which provides cryptographic recipes and primitives to Python developers."
-category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
@ -497,7 +480,6 @@ tox = ["tox"]
 name = "cssselect"
 version = "1.2.0"
 description = "cssselect parses CSS3 Selectors and translates them to XPath 1.0"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -509,7 +491,6 @@ files = [
 name = "distlib"
 version = "0.3.6"
 description = "Distribution utilities"
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@ -521,7 +502,6 @@ files = [
 name = "dnspython"
 version = "2.3.0"
 description = "DNS toolkit"
-category = "main"
 optional = false
 python-versions = ">=3.7,<4.0"
 files = [
@ -542,7 +522,6 @@ wmi = ["wmi (>=1.5.1,<2.0.0)"]
 name = "docutils"
 version = "0.18.1"
 description = "Docutils -- Python Documentation Utilities"
-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 files = [
@ -554,7 +533,6 @@ files = [
 name = "email-validator"
 version = "2.0.0.post2"
 description = "A robust email address syntax and deliverability validation library."
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -570,7 +548,6 @@ idna = ">=2.0.0"
 name = "exceptiongroup"
 version = "1.1.1"
 description = "Backport of PEP 654 (exception groups)"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -585,7 +562,6 @@ test = ["pytest (>=6)"]
 name = "faker"
 version = "18.9.0"
 description = "Faker is a Python package that generates fake data for you."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -601,7 +577,6 @@ typing-extensions = {version = ">=3.10.0.1", markers = "python_version < \"3.8\"
 name = "fancycompleter"
 version = "0.9.1"
 description = "colorful TAB completion for Python prompt"
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@ -617,7 +592,6 @@ pyrepl = ">=0.8.2"
 name = "filelock"
 version = "3.12.0"
 description = "A platform independent file lock."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -633,7 +607,6 @@ testing = ["covdefaults (>=2.3)", "coverage (>=7.2.3)", "diff-cover (>=7.5)", "p
 name = "flask"
 version = "2.2.5"
 description = "A simple framework for building complex web applications."
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -656,7 +629,6 @@ dotenv = ["python-dotenv"]
 name = "flask-babel"
 version = "3.1.0"
 description = "Adds i18n/l10n support for Flask applications."
-category = "main"
 optional = false
 python-versions = ">=3.7,<4.0"
 files = [
@ -674,7 +646,6 @@ pytz = ">=2022.7"
 name = "flask-themer"
 version = "1.4.3"
 description = "Simple theme mechanism for Flask"
-category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
@ -689,7 +660,6 @@ flask = "*"
 name = "flask-webtest"
 version = "0.1.3"
 description = "Utilities for testing Flask applications with WebTest."
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@ -709,7 +679,6 @@ tests = ["flask-sqlalchemy"]
 name = "flask-wtf"
 version = "1.1.1"
 description = "Form rendering, validation, and CSRF protection for Flask with WTForms."
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -729,7 +698,6 @@ email = ["email-validator"]
 name = "freezegun"
 version = "1.2.2"
 description = "Let your Python tests travel through time"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@ -744,7 +712,6 @@ python-dateutil = ">=2.7"
 name = "honcho"
 version = "1.1.0"
 description = "Honcho: a Python clone of Foreman. For managing Procfile-based applications."
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@ -762,7 +729,6 @@ export = ["jinja2 (>=2.7,<3)"]
 name = "identify"
 version = "2.5.24"
 description = "File identification library for Python"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -777,7 +743,6 @@ license = ["ukkonen"]
 name = "idna"
 version = "3.4"
 description = "Internationalized Domain Names in Applications (IDNA)"
-category = "main"
 optional = false
 python-versions = ">=3.5"
 files = [
@ -789,7 +754,6 @@ files = [
 name = "imagesize"
 version = "1.4.1"
 description = "Getting image size from png/jpeg/jpeg2000/gif file"
-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 files = [
@ -801,7 +765,6 @@ files = [
 name = "importlib-metadata"
 version = "6.6.0"
 description = "Read metadata from Python packages"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -822,7 +785,6 @@ testing = ["flake8 (<5)", "flufl.flake8", "importlib-resources (>=1.3)", "packag
 name = "iniconfig"
 version = "2.0.0"
 description = "brain-dead simple config-ini parsing"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -834,7 +796,6 @@ files = [
 name = "itsdangerous"
 version = "2.1.2"
 description = "Safely pass data to untrusted environments and back."
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -846,7 +807,6 @@ files = [
 name = "jinja2"
 version = "3.1.2"
 description = "A very fast and expressive template engine."
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -864,7 +824,6 @@ i18n = ["Babel (>=2.7)"]
 name = "lxml"
 version = "4.9.2"
 description = "Powerful and Pythonic XML processing library combining libxml2/libxslt with the ElementTree API."
-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, != 3.4.*"
 files = [
@ -957,7 +916,6 @@ source = ["Cython (>=0.29.7)"]
 name = "markupsafe"
 version = "2.1.2"
 description = "Safely add untrusted strings to HTML/XML markup."
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -1017,7 +975,6 @@ files = [
 name = "mock"
 version = "5.0.2"
 description = "Rolling backport of unittest.mock for all Pythons"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@ -1034,7 +991,6 @@ test = ["pytest", "pytest-cov"]
 name = "nodeenv"
 version = "1.8.0"
 description = "Node.js virtual environment builder"
-category = "dev"
 optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*"
 files = [
@ -1049,7 +1005,6 @@ setuptools = "*"
 name = "packaging"
 version = "23.1"
 description = "Core utilities for Python packages"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -1061,7 +1016,6 @@ files = [
 name = "pdbpp"
 version = "0.10.3"
 description = "pdb++, a drop-in replacement for pdb"
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@ -1082,7 +1036,6 @@ testing = ["funcsigs", "pytest"]
 name = "platformdirs"
 version = "3.5.1"
 description = "A small Python package for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -1101,7 +1054,6 @@ test = ["appdirs (==1.4.4)", "covdefaults (>=2.3)", "pytest (>=7.3.1)", "pytest-
 name = "pluggy"
 version = "1.0.0"
 description = "plugin and hook calling mechanisms for python"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@ -1120,7 +1072,6 @@ testing = ["pytest", "pytest-benchmark"]
 name = "portpicker"
 version = "1.5.2"
 description = "A library to choose unique available network ports."
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@ -1135,7 +1086,6 @@ psutil = "*"
 name = "pre-commit"
 version = "2.21.0"
 description = "A framework for managing and maintaining multi-language pre-commit hooks."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -1155,7 +1105,6 @@ virtualenv = ">=20.10.0"
 name = "psutil"
 version = "5.9.5"
 description = "Cross-platform lib for process and system monitoring in Python."
-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 files = [
@ -1182,7 +1131,6 @@ test = ["enum34", "ipaddress", "mock", "pywin32", "wmi"]
 name = "pyasn1"
 version = "0.5.0"
 description = "Pure-Python implementation of ASN.1 types and DER/BER/CER codecs (X.208)"
-category = "main"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,>=2.7"
 files = [
@ -1194,7 +1142,6 @@ files = [
 name = "pyasn1-modules"
 version = "0.3.0"
 description = "A collection of ASN.1-based protocols modules"
-category = "main"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,>=2.7"
 files = [
@ -1209,7 +1156,6 @@ pyasn1 = ">=0.4.6,<0.6.0"
 name = "pycountry"
 version = "22.3.5"
 description = "ISO country, subdivision, language, currency and script definitions and their translations"
-category = "main"
 optional = false
 python-versions = ">=3.6, <4"
 files = [
@ -1223,7 +1169,6 @@ setuptools = "*"
 name = "pycparser"
 version = "2.21"
 description = "C parser in Python"
-category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 files = [
@ -1235,7 +1180,6 @@ files = [
 name = "pygments"
 version = "2.15.1"
 description = "Pygments is a syntax highlighting package written in Python."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -1250,7 +1194,6 @@ plugins = ["importlib-metadata"]
 name = "pyquery"
 version = "2.0.0"
 description = "A jquery-like library for python"
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@ -1269,7 +1212,6 @@ test = ["pytest", "pytest-cov", "requests", "webob", "webtest"]
 name = "pyreadline"
 version = "2.1"
 description = "A python implmementation of GNU readline."
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@ -1280,7 +1222,6 @@ files = [
 name = "pyrepl"
 version = "0.9.0"
 description = "A library for building flexible command line interfaces"
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@ -1291,7 +1232,6 @@ files = [
 name = "pytest"
 version = "7.3.1"
 description = "pytest: simple powerful testing with Python"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -1313,14 +1253,13 @@ testing = ["argcomplete", "attrs (>=19.2.0)", "hypothesis (>=3.56)", "mock", "no

 [[package]]
 name = "pytest-cov"
-version = "4.0.0"
+version = "4.1.0"
 description = "Pytest plugin for measuring coverage."
-category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.7"
 files = [
-    {file = "pytest-cov-4.0.0.tar.gz", hash = "sha256:996b79efde6433cdbd0088872dbc5fb3ed7fe1578b68cdbba634f14bb8dd0470"},
-    {file = "pytest_cov-4.0.0-py3-none-any.whl", hash = "sha256:2feb1b751d66a8bd934e5edfa2e961d11309dc37b73b0eabe73b5945fee20f6b"},
+    {file = "pytest-cov-4.1.0.tar.gz", hash = "sha256:3904b13dfbfec47f003b8e77fd5b589cd11904a21ddf1ab38a64f204d6a10ef6"},
+    {file = "pytest_cov-4.1.0-py3-none-any.whl", hash = "sha256:6ba70b9e97e69fcc3fb45bfeab2d0a138fb65c4d0d6a41ef33983ad114be8c3a"},
 ]

 [package.dependencies]
@ -1334,7 +1273,6 @@ testing = ["fields", "hunter", "process-tests", "pytest-xdist", "six", "virtuale
 name = "pytest-cover"
 version = "3.0.0"
 description = "Pytest plugin for measuring coverage. Forked from `pytest-cov`."
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@ -1349,7 +1287,6 @@ pytest-cov = ">=2.0"
 name = "pytest-coverage"
 version = "0.0"
 description = "Pytest plugin for measuring coverage. Forked from `pytest-cov`."
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@ -1364,7 +1301,6 @@ pytest-cover = "*"
 name = "pytest-flask"
 version = "1.2.0"
 description = "A set of py.test fixtures to test Flask applications."
-category = "dev"
 optional = false
 python-versions = ">=3.5"
 files = [
@ -1384,7 +1320,6 @@ docs = ["Sphinx", "sphinx-rtd-theme"]
 name = "pytest-httpserver"
 version = "1.0.6"
 description = "pytest-httpserver is a httpserver for pytest"
-category = "dev"
 optional = false
 python-versions = ">=3.7,<4.0"
 files = [
@ -1399,7 +1334,6 @@ Werkzeug = ">=2.0.0"
 name = "python-dateutil"
 version = "2.8.2"
 description = "Extensions to the standard Python datetime module"
-category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
 files = [
@ -1414,7 +1348,6 @@ six = ">=1.5"
 name = "python-ldap"
 version = "3.4.3"
 description = "Python modules for implementing LDAP clients"
-category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
@ -1429,7 +1362,6 @@ pyasn1_modules = ">=0.1.5"
 name = "pytz"
 version = "2023.3"
 description = "World timezone definitions, modern and historical"
-category = "main"
 optional = false
 python-versions = "*"
 files = [
@ -1441,7 +1373,6 @@ files = [
 name = "pyyaml"
 version = "6.0"
 description = "YAML parser and emitter for Python"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@ -1489,14 +1420,13 @@ files = [

 [[package]]
 name = "requests"
-version = "2.30.0"
+version = "2.31.0"
 description = "Python HTTP for Humans."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "requests-2.30.0-py3-none-any.whl", hash = "sha256:10e94cc4f3121ee6da529d358cdaeaff2f1c409cd377dbc72b825852f2f7e294"},
-    {file = "requests-2.30.0.tar.gz", hash = "sha256:239d7d4458afcb28a692cdd298d87542235f4ca8d36d03a15bfc128a6559a2f4"},
+    {file = "requests-2.31.0-py3-none-any.whl", hash = "sha256:58cd2187c01e70e6e26505bca751777aa9f2ee0b7f4300988b709f44e013003f"},
+    {file = "requests-2.31.0.tar.gz", hash = "sha256:942c5a758f98d790eaed1a29cb6eefc7ffb0d1cf7af05c3d2791656dbd6ad1e1"},
 ]

 [package.dependencies]
@ -1513,7 +1443,6 @@ use-chardet-on-py3 = ["chardet (>=3.0.2,<6)"]
 name = "sentry-sdk"
 version = "1.21.1"
 description = "Python client for Sentry (https://sentry.io)"
-category = "main"
 optional = true
 python-versions = "*"
 files = [
@ -1557,7 +1486,6 @@ tornado = ["tornado (>=5)"]
 name = "setuptools"
 version = "67.8.0"
 description = "Easily download, build, install, upgrade, and uninstall Python packages"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -1574,7 +1502,6 @@ testing-integration = ["build[virtualenv]", "filelock (>=3.4.0)", "jaraco.envs (
 name = "six"
 version = "1.16.0"
 description = "Python 2 and 3 compatibility utilities"
-category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 files = [
@ -1586,7 +1513,6 @@ files = [
 name = "slapd"
 version = "0.1.3"
 description = "Controls a slapd process in a pythonic way"
-category = "dev"
 optional = false
 python-versions = ">=3.7,<4"
 files = [
@ -1598,7 +1524,6 @@ files = [
 name = "smtpdfix"
 version = "0.5.0"
 description = "A SMTP server for use as a pytest fixture that implements encryption and authentication for testing."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -1623,7 +1548,6 @@ typing = ["mypy"]
 name = "snowballstemmer"
 version = "2.2.0"
 description = "This package provides 29 stemmers for 28 languages generated from Snowball algorithms."
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@ -1635,7 +1559,6 @@ files = [
 name = "soupsieve"
 version = "2.4.1"
 description = "A modern CSS selector implementation for Beautiful Soup."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -1647,7 +1570,6 @@ files = [
 name = "sphinx"
 version = "5.3.0"
 description = "Python documentation generator"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@ -1683,7 +1605,6 @@ test = ["cython", "html5lib", "pytest (>=4.6)", "typed_ast"]
 name = "sphinx-issues"
 version = "3.0.1"
 description = "A Sphinx extension for linking to your project's issue tracker"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@ -1701,14 +1622,13 @@ tests = ["pytest (>=6.2.0)"]

 [[package]]
 name = "sphinx-rtd-theme"
-version = "1.2.0"
+version = "1.2.1"
 description = "Read the Docs theme for Sphinx"
-category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,>=2.7"
 files = [
-    {file = "sphinx_rtd_theme-1.2.0-py2.py3-none-any.whl", hash = "sha256:f823f7e71890abe0ac6aaa6013361ea2696fc8d3e1fa798f463e82bdb77eeff2"},
-    {file = "sphinx_rtd_theme-1.2.0.tar.gz", hash = "sha256:a0d8bd1a2ed52e0b338cbe19c4b2eef3c5e7a048769753dac6a9f059c7b641b8"},
+    {file = "sphinx_rtd_theme-1.2.1-py2.py3-none-any.whl", hash = "sha256:2cc9351176cbf91944ce44cefd4fab6c3b76ac53aa9e15d6db45a3229ad7f866"},
+    {file = "sphinx_rtd_theme-1.2.1.tar.gz", hash = "sha256:cf9a7dc0352cf179c538891cb28d6fad6391117d4e21c891776ab41dd6c8ff70"},
 ]

 [package.dependencies]
@ -1723,7 +1643,6 @@ dev = ["bump2version", "sphinxcontrib-httpdomain", "transifex-client", "wheel"]
 name = "sphinxcontrib-applehelp"
 version = "1.0.2"
 description = "sphinxcontrib-applehelp is a sphinx extension which outputs Apple help books"
-category = "dev"
 optional = false
 python-versions = ">=3.5"
 files = [
@ -1739,7 +1658,6 @@ test = ["pytest"]
 name = "sphinxcontrib-devhelp"
 version = "1.0.2"
 description = "sphinxcontrib-devhelp is a sphinx extension which outputs Devhelp document."
-category = "dev"
 optional = false
 python-versions = ">=3.5"
 files = [
@ -1755,7 +1673,6 @@ test = ["pytest"]
 name = "sphinxcontrib-htmlhelp"
 version = "2.0.0"
 description = "sphinxcontrib-htmlhelp is a sphinx extension which renders HTML help files"
-category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
@ -1771,7 +1688,6 @@ test = ["html5lib", "pytest"]
 name = "sphinxcontrib-jquery"
 version = "4.1"
 description = "Extension to include jQuery on newer Sphinx releases"
-category = "dev"
 optional = false
 python-versions = ">=2.7"
 files = [
@ -1786,7 +1702,6 @@ Sphinx = ">=1.8"
 name = "sphinxcontrib-jsmath"
 version = "1.0.1"
 description = "A sphinx extension which renders display math in HTML via JavaScript"
-category = "dev"
 optional = false
 python-versions = ">=3.5"
 files = [
@ -1801,7 +1716,6 @@ test = ["flake8", "mypy", "pytest"]
 name = "sphinxcontrib-qthelp"
 version = "1.0.3"
 description = "sphinxcontrib-qthelp is a sphinx extension which outputs QtHelp document."
-category = "dev"
 optional = false
 python-versions = ">=3.5"
 files = [
@ -1817,7 +1731,6 @@ test = ["pytest"]
 name = "sphinxcontrib-serializinghtml"
 version = "1.1.5"
 description = "sphinxcontrib-serializinghtml is a sphinx extension which outputs \"serialized\" HTML files (json and pickle)."
-category = "dev"
 optional = false
 python-versions = ">=3.5"
 files = [
@ -1833,7 +1746,6 @@ test = ["pytest"]
 name = "toml"
 version = "0.10.2"
 description = "Python Library for Tom's Obvious, Minimal Language"
-category = "main"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 files = [
@ -1845,7 +1757,6 @@ files = [
 name = "tomli"
 version = "2.0.1"
 description = "A lil' TOML parser"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -1855,21 +1766,19 @@ files = [

 [[package]]
 name = "typing-extensions"
-version = "4.5.0"
+version = "4.6.2"
 description = "Backported and Experimental Type Hints for Python 3.7+"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "typing_extensions-4.5.0-py3-none-any.whl", hash = "sha256:fb33085c39dd998ac16d1431ebc293a8b3eedd00fd4a32de0ff79002c19511b4"},
-    {file = "typing_extensions-4.5.0.tar.gz", hash = "sha256:5cb5f4a79139d699607b3ef622a1dedafa84e115ab0024e0d9c044a9479ca7cb"},
+    {file = "typing_extensions-4.6.2-py3-none-any.whl", hash = "sha256:3a8b36f13dd5fdc5d1b16fe317f5668545de77fa0b8e02006381fd49d731ab98"},
+    {file = "typing_extensions-4.6.2.tar.gz", hash = "sha256:06006244c70ac8ee83fa8282cb188f697b8db25bc8b4df07be1873c43897060c"},
 ]

 [[package]]
 name = "urllib3"
 version = "2.0.2"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -1887,7 +1796,6 @@ zstd = ["zstandard (>=0.18.0)"]
 name = "virtualenv"
 version = "20.23.0"
 description = "Virtual Python Environment builder"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -1909,7 +1817,6 @@ test = ["covdefaults (>=2.3)", "coverage (>=7.2.3)", "coverage-enable-subprocess
 name = "waitress"
 version = "2.1.2"
 description = "Waitress WSGI server"
-category = "dev"
 optional = false
 python-versions = ">=3.7.0"
 files = [
@ -1925,7 +1832,6 @@ testing = ["coverage (>=5.0)", "pytest", "pytest-cover"]
 name = "webob"
 version = "1.8.7"
 description = "WSGI request and response object"
-category = "dev"
 optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*"
 files = [
@ -1941,7 +1847,6 @@ testing = ["coverage", "pytest (>=3.1.0)", "pytest-cov", "pytest-xdist"]
 name = "webtest"
 version = "3.0.0"
 description = "Helper to test WSGI applications"
-category = "dev"
 optional = false
 python-versions = ">=3.6, <4"
 files = [
@ -1962,7 +1867,6 @@ tests = ["PasteDeploy", "WSGIProxy2", "coverage", "pyquery", "pytest", "pytest-c
 name = "werkzeug"
 version = "2.2.3"
 description = "The comprehensive WSGI web application library."
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -1980,7 +1884,6 @@ watchdog = ["watchdog"]
 name = "wmctrl"
 version = "0.4"
 description = "A tool to programmatically control windows inside X"
-category = "dev"
 optional = false
 python-versions = "*"
 files = [
@ -1991,7 +1894,6 @@ files = [
 name = "wtforms"
 version = "3.0.1"
 description = "Form validation and rendering for Python web development."
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -2009,7 +1911,6 @@ email = ["email-validator"]
 name = "zipp"
 version = "3.15.0"
 description = "Backport of pathlib-compatible object wrapper for zip files"
-category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
@ -2027,4 +1928,4 @@ sentry = ["sentry-sdk"]
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.7, <4"
-content-hash = "ba916dfc7340b0327fba0582d2153de589525f77820e411afc10b2fd19060c22"
+content-hash = "ea6edd79777591d8c6232b5cd2d712a4de68e72475aca7b7c6417328eac5ea61"
--- a/pyproject.toml
+++ b/pyproject.toml
@ -46,6 +46,7 @@ flask-themer = "<2"
 flask-wtf = "<2"
 pycountry = "^22.3.5"
 python-ldap = "<4"
+pytz = "^2023.3"
 toml = "<1"
 wtforms = "<4"

--- a/tests/app/test_forms.py
+++ b/tests/app/test_forms.py
@ -0,0 +1,186 @@
+import datetime
+
+import wtforms
+from babel.dates import LOCALTZ
+from canaille.app.forms import DateTimeUTCField
+from flask import current_app
+from werkzeug.datastructures import ImmutableMultiDict
+
+
+def test_datetime_utc_field_no_timezone_is_local_timezone(testclient):
+    del current_app.config["TIMEZONE"]
+
+    offset = LOCALTZ.utcoffset(datetime.datetime.utcnow())
+
+    class TestForm(wtforms.Form):
+        dt = DateTimeUTCField()
+
+    form = TestForm()
+    form.validate()
+    assert form.dt.data is None
+
+    utc_date = datetime.datetime(2023, 6, 1, 12, tzinfo=datetime.timezone.utc)
+    locale_date = datetime.datetime(2023, 6, 1, 12) + offset
+    rendered_locale_date = locale_date.strftime("%Y-%m-%d %H:%M:%S")
+    rendered_locale_date_form = locale_date.strftime("%Y-%m-%d %H:%M:%S")
+
+    request_form = ImmutableMultiDict({"dt": rendered_locale_date_form})
+    form = TestForm(request_form)
+    assert form.validate()
+    assert form.dt.data == utc_date
+    assert (
+        form.dt()
+        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date_form}">'
+    )
+
+    form = TestForm(data={"dt": utc_date})
+    assert form.validate()
+    assert form.dt.data == utc_date
+    assert (
+        form.dt()
+        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date}">'
+    )
+
+    class Foobar:
+        dt = utc_date
+
+    form = TestForm(obj=Foobar())
+    assert form.validate()
+    assert form.dt.data == utc_date
+    assert (
+        form.dt()
+        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date}">'
+    )
+
+
+def test_datetime_utc_field_utc(testclient):
+    current_app.config["TIMEZONE"] = "UTC"
+
+    class TestForm(wtforms.Form):
+        dt = DateTimeUTCField()
+
+    form = TestForm()
+    form.validate()
+    assert form.dt.data is None
+
+    date = datetime.datetime(2023, 6, 1, 12, tzinfo=datetime.timezone.utc)
+    rendered_date = date.strftime("%Y-%m-%d %H:%M:%S")
+    rendered_date_form = date.strftime("%Y-%m-%d %H:%M:%S")
+
+    request_form = ImmutableMultiDict({"dt": rendered_date_form})
+    form = TestForm(request_form)
+    assert form.validate()
+    assert form.dt.data == date
+    assert (
+        form.dt()
+        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_date_form}">'
+    )
+
+    form = TestForm(data={"dt": date})
+    assert form.validate()
+    assert form.dt.data == date
+    assert (
+        form.dt()
+        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_date}">'
+    )
+
+    class Foobar:
+        dt = date
+
+    form = TestForm(obj=Foobar())
+    assert form.validate()
+    assert form.dt.data == date
+    assert (
+        form.dt()
+        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_date}">'
+    )
+
+
+def test_datetime_utc_field_japan_timezone(testclient):
+    current_app.config["TIMEZONE"] = "Japan"
+
+    class TestForm(wtforms.Form):
+        dt = DateTimeUTCField()
+
+    form = TestForm()
+    form.validate()
+    assert form.dt.data is None
+
+    utc_date = datetime.datetime(2023, 6, 1, 12, tzinfo=datetime.timezone.utc)
+    locale_date = datetime.datetime(2023, 6, 1, 21)
+    rendered_locale_date = locale_date.strftime("%Y-%m-%d %H:%M:%S")
+    rendered_locale_date_form = locale_date.strftime("%Y-%m-%d %H:%M:%S")
+
+    request_form = ImmutableMultiDict({"dt": rendered_locale_date_form})
+    form = TestForm(request_form)
+    assert form.validate()
+    assert form.dt.data == utc_date
+    assert (
+        form.dt()
+        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date_form}">'
+    )
+
+    form = TestForm(data={"dt": utc_date})
+    assert form.validate()
+    assert form.dt.data == utc_date
+    assert (
+        form.dt()
+        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date}">'
+    )
+
+    class Foobar:
+        dt = utc_date
+
+    form = TestForm(obj=Foobar())
+    assert form.validate()
+    assert form.dt.data == utc_date
+    assert (
+        form.dt()
+        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date}">'
+    )
+
+
+def test_datetime_utc_field_invalid_timezone(testclient):
+    current_app.config["TIMEZONE"] = "invalid"
+
+    offset = LOCALTZ.utcoffset(datetime.datetime.utcnow())
+
+    class TestForm(wtforms.Form):
+        dt = DateTimeUTCField()
+
+    form = TestForm()
+    form.validate()
+    assert form.dt.data is None
+
+    utc_date = datetime.datetime(2023, 6, 1, 12, tzinfo=datetime.timezone.utc)
+    locale_date = datetime.datetime(2023, 6, 1, 12) + offset
+    rendered_locale_date = locale_date.strftime("%Y-%m-%d %H:%M:%S")
+    rendered_locale_date_form = locale_date.strftime("%Y-%m-%d %H:%M:%S")
+
+    request_form = ImmutableMultiDict({"dt": rendered_locale_date_form})
+    form = TestForm(request_form)
+    assert form.validate()
+    assert form.dt.data == utc_date
+    assert (
+        form.dt()
+        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date_form}">'
+    )
+
+    form = TestForm(data={"dt": utc_date})
+    assert form.validate()
+    assert form.dt.data == utc_date
+    assert (
+        form.dt()
+        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date}">'
+    )
+
+    class Foobar:
+        dt = utc_date
+
+    form = TestForm(obj=Foobar())
+    assert form.validate()
+    assert form.dt.data == utc_date
+    assert (
+        form.dt()
+        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date}">'
+    )
--- a/tests/conftest.py
+++ b/tests/conftest.py
@ -76,6 +76,7 @@ def configuration(slapd_server, smtpd):
    conf = {
        "SECRET_KEY": gen_salt(24),
        "LOGO": "/static/img/canaille-head.png",
+        "TIMEZONE": "UTC",
        "BACKENDS": {
            "LDAP": {
                "ROOT_DN": slapd_server.suffix,