Read a post's date as the Berlin calendar day, not the raw UTC day

Elternbeirat.Web.Tests/PocketBaseClientTests.cs

@@ -64,6 +64,20 @@ public sealed class PocketBaseClientTests(PocketBaseFixture pocketBase)
         posts.Select(p => p.Title).ShouldBe(["Neuer Vorstand", "Neue Sporthalle"]);
     }
 
+    [Fact]
+    public async Task Post_date_is_the_berlin_calendar_day()
+    {
+        var client = pocketBase.CreateClient();
+
+        var posts = await client.GetPostsAsync();
+
+        // The post is seeded as 2026-03-01 23:30Z, which is 2 March 00:30 in Berlin.
+        // The date is the Berlin day the editor picked (2 March), not the raw UTC
+        // day (1 March) -- the time zone is applied before the day is taken.
+        var post = posts.Single(p => p.Title == "Neuer Vorstand");
+        post.Date.ShouldBe(new DateOnly(2026, 3, 2));
+    }
+
     [Fact]
     public async Task Pages_exclude_non_public_records()
     {

Elternbeirat.Web.Tests/PocketBaseFixture.cs

@@ -283,10 +283,13 @@ public sealed class PocketBaseFixture : IAsyncLifetime
             order = 9, slug = "draft", embed = Array.Empty<string>(), @public = false,
         });
 
-        // Posts: newest first once sorted by -date.
+        // Posts: newest first once sorted by -date. The first post is stored as
+        // 2026-03-01 23:30Z on purpose: that is 2 March 00:30 in Berlin (winter,
+        // UTC+1). An editor who picked 2 March must get 2 March back -- the date is
+        // the Berlin day, so it must NOT be read as the raw UTC day (1 March).
         await CreateRecordAsync(http, "posts", new
         {
-            date = "2026-03-01 00:00:00.000Z", title = "Neuer Vorstand",
+            date = "2026-03-01 23:30:00.000Z", title = "Neuer Vorstand",
             body = "Text", slug = "new-board", @public = true,
         });
         await CreateRecordAsync(http, "posts", new