frontend: date UTC convertite in ora italiana alla presentazione (#42)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/frontend/flask_app/app.py

@@ -2,7 +2,8 @@
 import json
 import os
 import re
-from datetime import date
+from datetime import date, datetime, timezone
+from zoneinfo import ZoneInfo
 from urllib.parse import urlparse
 
 from flask import Flask, flash, g, jsonify, redirect, url_for, session, request
@@ -154,6 +155,26 @@ def create_app() -> Flask:
         bolded = _BOLD_RX.sub(r"<strong>\1</strong>", escaped)
         return Markup(bolded.replace("\n", "<br>"))
 
+    @app.template_filter("local_dt")
+    def local_dt_filter(value, fmt="%d/%m/%Y %H:%M"):
+        """Show a UTC datetime (ISO string or datetime) in DISPLAY_TIMEZONE.
+
+        A value without timezone is taken as UTC. None or empty gives "-".
+        """
+        if value is None or value == "":
+            return "-"
+        if isinstance(value, str):
+            try:
+                value = datetime.fromisoformat(value.strip().replace("Z", "+00:00"))
+            except ValueError:
+                return value
+        if not isinstance(value, datetime):
+            return str(value)
+        if value.tzinfo is None:
+            value = value.replace(tzinfo=timezone.utc)
+        tz = ZoneInfo(app.config.get("DISPLAY_TIMEZONE") or "Europe/Rome")
+        return value.astimezone(tz).strftime(fmt)
+
     @app.template_filter("tojson_attr")
     def tojson_attr_filter(value):
         """JSON encode safe for HTML attributes (x-data, etc.).

src/frontend/flask_app/config.py

@@ -56,6 +56,8 @@ class Config:
     # Babel i18n
     BABEL_DEFAULT_LOCALE = "it"
     BABEL_DEFAULT_TIMEZONE = "Europe/Rome"
+    # Il DB e le API parlano UTC; si converte solo alla presentazione.
+    DISPLAY_TIMEZONE: str = os.getenv("DISPLAY_TIMEZONE", "Europe/Rome")
     LANGUAGES = {"it": "Italiano", "en": "English"}
 
 

src/frontend/flask_app/static/js/csv-export.js

@@ -271,7 +271,7 @@ function csvExport() {
      */
     generateFilename(prefix) {
       const now = new Date();
-      const dateStr = now.toISOString().slice(0, 10); // YYYY-MM-DD
+      const dateStr = `${now.getFullYear()}-${String(now.getMonth() + 1).padStart(2, '0')}-${String(now.getDate()).padStart(2, '0')}`; // YYYY-MM-DD locale
       const timeStr = now.toTimeString().slice(0, 5).replace(':', ''); // HHMM
 
       return `${prefix}_${dateStr}_${timeStr}.csv`;

src/frontend/flask_app/templates/measure/task_complete.html

@@ -183,7 +183,7 @@
                     {% for m in measurements|sort(attribute='subtask.marker_number')|sort(attribute='task_info.order_index') %}
                     <tr>
                         <td class="text-center font-mono text-xs" style="color: var(--text-secondary);">
-                            {{ m.measured_at[:16]|replace('T', ' ') if m.measured_at else '-' }}
+                            {{ m.measured_at|local_dt }}
                         </td>
                         <td style="color: var(--text-secondary);" class="text-sm">
                             {{ m.task_info.title if m.task_info else '-' }}

src/frontend/flask_app/templates/statistics/dashboard.html

@@ -312,8 +312,8 @@ function spcDashboard() {
       const params = new URLSearchParams();
       params.set('recipe_id', this.selectedRecipeId);
       if (this.selectedSubtaskId) params.set('subtask_id', this.selectedSubtaskId);
-      if (this.dateFrom) params.set('date_from', this.dateFrom + 'T00:00:00');
+      if (this.dateFrom) params.set('date_from', new Date(this.dateFrom + 'T00:00:00').toISOString());
-      if (this.dateTo) params.set('date_to', this.dateTo + 'T23:59:59');
+      if (this.dateTo) params.set('date_to', new Date(this.dateTo + 'T23:59:59.999').toISOString());
 
       try {
         // Parallel fetch of all endpoints
@@ -417,8 +417,8 @@ function spcDashboard() {
         const params = new URLSearchParams();
         params.set('recipe_id', this.selectedRecipeId);
         if (this.selectedSubtaskId) params.set('subtask_id', this.selectedSubtaskId);
-        if (this.dateFrom) params.set('date_from', this.dateFrom + 'T00:00:00');
+        if (this.dateFrom) params.set('date_from', new Date(this.dateFrom + 'T00:00:00').toISOString());
-        if (this.dateTo) params.set('date_to', this.dateTo + 'T23:59:59');
+        if (this.dateTo) params.set('date_to', new Date(this.dateTo + 'T23:59:59.999').toISOString());
 
         const url = '/statistics/api/report-' + type + '?' + params.toString();
         const resp = await fetch(url);

src/frontend/flask_app/tests/test_local_dt.py

@@ -0,0 +1,31 @@
+"""Filtro local_dt: il backend parla UTC, la presentazione e' in Europe/Rome (#42)."""
+from datetime import datetime, timezone
+
+import pytest
+
+
+@pytest.fixture
+def local_dt(flask_app):
+    return flask_app.jinja_env.filters["local_dt"]
+
+
+def test_summer_time(local_dt):
+    assert local_dt("2026-10-06T08:00:00+00:00") == "06/10/2026 10:00"
+
+
+def test_winter_time(local_dt):
+    assert local_dt("2026-01-15T08:00:00+00:00") == "15/01/2026 09:00"
+
+
+def test_naive_is_utc(local_dt):
+    assert local_dt("2026-10-06T08:00:00") == "06/10/2026 10:00"
+
+
+def test_datetime_object_and_format(local_dt):
+    dt = datetime(2026, 10, 6, 8, 0, tzinfo=timezone.utc)
+    assert local_dt(dt, "%H:%M") == "10:00"
+
+
+@pytest.mark.parametrize("empty", [None, ""])
+def test_empty(local_dt, empty):
+    assert local_dt(empty) == "-"

src/frontend/flask_app/tests/test_measure.py

@@ -407,6 +407,21 @@ class TestTaskComplete:
         assert resp.status_code == 200
         assert b"productionClock(" in resp.data
 
+    def test_measured_at_shown_in_local_time(self, logged_in_client, mock_api_client):
+        """#42: the API sends UTC; the summary shows Europe/Rome."""
+        mock_api_client.get.side_effect = [
+            {"id": 1, "code": "REC-001", "name": "Test Recipe", "version": 1},
+            [{"id": 1, "title": "Task 1", "order_index": 0, "subtasks": [
+                {"id": 1, "marker_number": 1, "description": "d", "nominal": 1.0,
+                 "unit": "mm"}]}],
+            None,
+            {"items": [{"id": 1, "subtask_id": 1, "value": 1.0, "pass_fail": "pass",
+                        "measured_at": "2026-10-06T08:00:00+00:00"}]},
+        ]
+        resp = logged_in_client.get("/measure/complete/1?version_id=5")
+        assert resp.status_code == 200
+        assert "06/10/2026 10:00" in resp.get_data(as_text=True)
+
     def test_measurements_filtered_by_lot_serial_and_operator(
         self, logged_in_client, mock_api_client,
     ):