Revised the calculation of "today" to use the client's timezone instead of the server's timezone.

src/accounting/journal_entry/views.py

@@ -1,7 +1,7 @@
 # The Mia! Accounting Project.
 # Author: imacat@mail.imacat.idv.tw (imacat), 2023/2/18
 
-#  Copyright (c) 2023 imacat.
+#  Copyright (c) 2023-2024 imacat.
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
@@ -33,6 +33,7 @@ from accounting.utils.flash_errors import flash_form_errors
 from accounting.utils.journal_entry_types import JournalEntryType
 from accounting.utils.next_uri import inherit_next, or_next
 from accounting.utils.permission import has_permission, can_view, can_edit
+from accounting.utils.timezone import get_tz_today
 from accounting.utils.user import get_current_user_pk
 from .forms import sort_journal_entries_in, JournalEntryReorderForm
 from .template_filters import with_type, to_transfer, format_amount_input, \
@@ -67,7 +68,7 @@ def show_add_journal_entry_form(journal_entry_type: JournalEntryType) -> str:
         form.validate()
     else:
         form = journal_entry_op.form()
-        form.date.data = dt.date.today()
+        form.date.data = get_tz_today()
     return journal_entry_op.render_create_template(form)
 
 

src/accounting/report/period/chooser.py

@@ -1,7 +1,7 @@
 # The Mia! Accounting Project.
 # Author: imacat@mail.imacat.idv.tw (imacat), 2023/3/4
 
-#  Copyright (c) 2023 imacat.
+#  Copyright (c) 2023-2024 imacat.
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
@@ -24,6 +24,7 @@ import datetime as dt
 from collections.abc import Callable
 
 from accounting.models import JournalEntry
+from accounting.utils.timezone import get_tz_today
 from .period import Period
 from .shortcuts import ThisMonth, LastMonth, SinceLastMonth, ThisYear, \
     LastYear, Today, Yesterday, AllTime, TemplatePeriod, YearPeriod
@@ -80,7 +81,7 @@ class PeriodChooser:
         """The available years."""
 
         if self.has_data:
-            today: dt.date = dt.date.today()
+            today: dt.date = get_tz_today()
             self.has_last_month = start < dt.date(today.year, today.month, 1)
             self.has_last_year = start.year < today.year
             self.has_yesterday = start < today

src/accounting/report/period/shortcuts.py

@@ -1,7 +1,7 @@
 # The Mia! Accounting Project.
 # Author: imacat@mail.imacat.idv.tw (imacat), 2023/3/4
 
-#  Copyright (c) 2023 imacat.
+#  Copyright (c) 2023-2024 imacat.
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
@@ -20,6 +20,7 @@
 import datetime as dt
 
 from accounting.locale import gettext
+from accounting.utils.timezone import get_tz_today
 from .month_end import month_end
 from .period import Period
 
@@ -27,7 +28,7 @@ from .period import Period
 class ThisMonth(Period):
     """The period of this month."""
     def __init__(self):
-        today: dt.date = dt.date.today()
+        today: dt.date = get_tz_today()
         this_month_start: dt.date = dt.date(today.year, today.month, 1)
         super().__init__(this_month_start, month_end(today))
         self.is_default = True
@@ -43,7 +44,7 @@ class ThisMonth(Period):
 class LastMonth(Period):
     """The period of this month."""
     def __init__(self):
-        today: dt.date = dt.date.today()
+        today: dt.date = get_tz_today()
         year: int = today.year
         month: int = today.month - 1
         if month < 1:
@@ -63,7 +64,7 @@ class LastMonth(Period):
 class SinceLastMonth(Period):
     """The period of this month."""
     def __init__(self):
-        today: dt.date = dt.date.today()
+        today: dt.date = get_tz_today()
         year: int = today.year
         month: int = today.month - 1
         if month < 1:
@@ -82,7 +83,7 @@ class SinceLastMonth(Period):
 class ThisYear(Period):
     """The period of this year."""
     def __init__(self):
-        year: int = dt.date.today().year
+        year: int = get_tz_today().year
         start: dt.date = dt.date(year, 1, 1)
         end: dt.date = dt.date(year, 12, 31)
         super().__init__(start, end)
@@ -97,7 +98,7 @@ class ThisYear(Period):
 class LastYear(Period):
     """The period of last year."""
     def __init__(self):
-        year: int = dt.date.today().year
+        year: int = get_tz_today().year
         start: dt.date = dt.date(year - 1, 1, 1)
         end: dt.date = dt.date(year - 1, 12, 31)
         super().__init__(start, end)
@@ -112,7 +113,7 @@ class LastYear(Period):
 class Today(Period):
     """The period of today."""
     def __init__(self):
-        today: dt.date = dt.date.today()
+        today: dt.date = get_tz_today()
         super().__init__(today, today)
         self.is_today = True
 
@@ -125,7 +126,7 @@ class Today(Period):
 class Yesterday(Period):
     """The period of yesterday."""
     def __init__(self):
-        yesterday: dt.date = dt.date.today() - dt.timedelta(days=1)
+        yesterday: dt.date = get_tz_today() - dt.timedelta(days=1)
         super().__init__(yesterday, yesterday)
         self.is_yesterday = True
 

src/accounting/static/js/timezone.js

@@ -0,0 +1,37 @@
+/* The Mia! Accounting Project
+ * timezone.js: The JavaScript for the timezone
+ */
+
+/*  Copyright (c) 2024 imacat.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+/* Author: imacat@mail.imacat.idv.tw (imacat)
+ * First written: 2024/6/4
+ */
+"use strict";
+
+// Initializes the page JavaScript.
+document.addEventListener("DOMContentLoaded", () => {
+    setTimeZone();
+});
+
+/**
+ * Sets the time zone.
+ *
+ * @private
+ */
+function setTimeZone() {
+    document.cookie = `accounting-tz=${Intl.DateTimeFormat().resolvedOptions().timeZone}; SameSite=Strict`;
+}

src/accounting/template_filters.py

@@ -1,7 +1,7 @@
 # The Mia! Accounting Project.
 # Author: imacat@mail.imacat.idv.tw (imacat), 2023/2/25
 
-#  Copyright (c) 2023 imacat.
+#  Copyright (c) 2023-2024 imacat.
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
@@ -24,6 +24,7 @@ from typing import Any
 from flask_babel import get_locale
 
 from accounting.locale import gettext
+from accounting.utils.timezone import get_tz_today
 
 
 def format_amount(value: Decimal | None) -> str | None:
@@ -47,7 +48,7 @@ def format_date(value: dt.date) -> str:
     :param value: The date.
     :return: The human-friendly date text.
     """
-    today: dt.date = dt.date.today()
+    today: dt.date = get_tz_today()
     if value == today:
         return gettext("Today")
     if value == today - dt.timedelta(days=1):

src/accounting/templates/accounting/base.html

@@ -2,7 +2,7 @@
 The Mia! Accounting Project
 base.html: The application-wide base template.
 
- Copyright (c) 2023 imacat.
+ Copyright (c) 2023-2024 imacat.
 
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
@@ -27,5 +27,6 @@ First written: 2023/1/27
 
 {% block scripts %}
   <script src="{{ url_for("accounting.babel_catalog") }}"></script>
+  <script src="{{ url_for("accounting.static", filename="js/timezone.js") }}"></script>
   {% block accounting_scripts %}{% endblock %}
 {% endblock %}

src/accounting/utils/timezone.py

@@ -0,0 +1,37 @@
+# The Mia! Accounting Project.
+# Author: imacat@mail.imacat.idv.tw (imacat), 2024/6/4
+
+#  Copyright (c) 2024 imacat.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+"""The timezone utility.
+
+This module should not import any other module from the application.
+
+"""
+
+import datetime as dt
+
+import pytz
+from flask import request
+
+
+def get_tz_today() -> dt.date:
+    """Returns today in the client timezone.
+
+    :return: today in the client timezone.
+    """
+    tz_name: str | None = request.cookies.get("accounting-tz")
+    if tz_name is None:
+        return dt.date.today()
+    return dt.datetime.now(tz=pytz.timezone(tz_name)).date()

tests/test_site/lib.py

@@ -1,7 +1,7 @@
 # The Mia! Accounting Demonstration Website.
 # Author: imacat@mail.imacat.idv.tw (imacat), 2023/4/13
 
-#  Copyright (c) 2023 imacat.
+#  Copyright (c) 2023-2024 imacat.
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
@@ -28,6 +28,7 @@ from typing import Any
 import sqlalchemy as sa
 from flask import Flask
 
+from accounting.utils.timezone import get_tz_today
 from . import db
 from .auth import User
 
@@ -44,6 +45,17 @@ class Accounts:
     MEAL: str = "6272-001"
 
 
+def get_today() -> dt.date:
+    """Returns today, based on the context.
+
+    :return: Today.
+    """
+    try:
+        return get_tz_today()
+    except RuntimeError:
+        return dt.date.today()
+
+
 class JournalEntryLineItemData:
     """The journal entry line item data."""
 
@@ -183,7 +195,7 @@ class JournalEntryData:
         :param is_update: True for an update operation, or False otherwise
         :return: The journal entry as a form.
         """
-        date: dt.date = dt.date.today() - dt.timedelta(days=self.days)
+        date: dt.date = get_today() - dt.timedelta(days=self.days)
         form: dict[str, str] = {"csrf_token": csrf_token,
                                 "next": encoded_next_uri,
                                 "date": date.isoformat()}
@@ -260,8 +272,7 @@ class BaseTestData(ABC):
         existing_j_id: set[int] = {x["id"] for x in self.__journal_entries}
         existing_l_id: set[int] = {x["id"] for x in self.__line_items}
         journal_entry_data.id = self.__new_id(existing_j_id)
-        date: dt.date \
-            = dt.date.today() - dt.timedelta(days=journal_entry_data.days)
+        date: dt.date = get_today() - dt.timedelta(days=journal_entry_data.days)
         self.__journal_entries.append(
             {"id": journal_entry_data.id,
              "date": date,

tests/test_site/reset.py

@@ -1,7 +1,7 @@
 # The Mia! Accounting Demonstration Website.
 # Author: imacat@mail.imacat.idv.tw (imacat), 2023/4/12
 
-#  Copyright (c) 2023 imacat.
+#  Copyright (c) 2023-2024 imacat.
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
@@ -23,6 +23,7 @@ from flask import Flask, Blueprint, url_for, flash, redirect, session, \
     render_template, current_app
 from flask_babel import lazy_gettext
 
+from accounting.utils.timezone import get_tz_today
 from . import db
 from .auth import admin_required
 from .lib import Accounts, JournalEntryLineItemData, JournalEntryData, \
@@ -117,7 +118,7 @@ class SampleData(BaseTestData):
 
         :return: None.
         """
-        today: dt.date = dt.date.today()
+        today: dt.date = get_tz_today()
         days: int
         year: int
         month: int
@@ -160,7 +161,7 @@ class SampleData(BaseTestData):
 
         :return: None.
         """
-        today: dt.date = dt.date.today()
+        today: dt.date = get_tz_today()
 
         year: int = today.year - 5
         month: int = today.month