fix: standardize UTC timestamp handling

app/__init__.py

@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import logging
-from datetime import datetime
 
 from flask import Flask, abort, jsonify, request
 
@@ -10,7 +9,7 @@ from .extensions import db, login_manager
 from .models import AppSetting, User
 from .prediction import FEATURES, load_model
 from .security import csrf_token, validate_csrf_token
-from .time_utils import format_datetime_for_timezone
+from .time_utils import current_year_for_timezone, format_datetime_for_timezone
 
 
 def create_app(config_object: type[Config] = Config, *, load_model_on_start: bool = True) -> Flask:
@@ -90,7 +89,7 @@ def register_app_hooks(app: Flask) -> None:
     @app.context_processor
     def inject_helpers():
         def now_year() -> int:
-            return datetime.now().year
+            return current_year_for_timezone(app.config["APP_TIMEZONE"])
 
         def format_datetime(value) -> str:
             return format_datetime_for_timezone(value, app.config["APP_TIMEZONE"])