Use Clock.Now (time-zone aware) instead of raw DateTime.Now for expiry checks

Controllers/DisplayController.cs

@@ -1,6 +1,7 @@
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
 using NoticeBoard.Data;
+using NoticeBoard.Infrastructure;
 
 namespace NoticeBoard.Controllers;
 
@@ -27,7 +28,7 @@ public class DisplayController : Controller
         }
 
         // Skip expired Meows — expiry is enforced at playback time, not on the stored data
-        var now = DateTime.Now;
+        var now = Clock.Now;
         device.DeviceSlides = device.DeviceSlides
             .Where(ds => ds.Slide.ExpiresAt == null || ds.Slide.ExpiresAt > now)
             .ToList();
@@ -46,7 +47,7 @@ public class DisplayController : Controller
 
         if (device == null) return NotFound();
 
-        var now = DateTime.Now;
+        var now = Clock.Now;
         var playlist = device.DeviceSlides
             .Where(ds => ds.Slide.ExpiresAt == null || ds.Slide.ExpiresAt > now)
             .Select(ds => new