Generate navigation and render page embeds from PocketBase

Elternbeirat.Web/Shared/EventFormat.cs

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+using System.Globalization;
+using Elternbeirat.Contracts;
+
+namespace Elternbeirat.Web.Shared;
+
+/// <summary>
+/// Formats an <see cref="Event"/>'s date range for display in German. Shared by
+/// the full event list and the home-page events embed so both render dates the
+/// same way.
+/// </summary>
+public static class EventFormat
+{
+    private static readonly CultureInfo German = CultureInfo.GetCultureInfo("de-DE");
+
+    // An event counts as all-day when its start carries no wall-clock time
+    // (00:00); PocketBase has no separate flag.
+    private static bool HasTime(Event ev) => ev.Start.TimeOfDay != TimeSpan.Zero;
+
+    /// <summary>
+    /// Formats the entry's date range: a single day, a date with a time, or a
+    /// span across days.
+    /// </summary>
+    public static string Range(Event ev)
+    {
+        var start = HasTime(ev)
+            ? ev.Start.ToString("dddd, d. MMMM yyyy, HH:mm", German) + " Uhr"
+            : ev.Start.ToString("dddd, d. MMMM yyyy", German);
+
+        if (ev.End is not { } end)
+        {
+            return start;
+        }
+
+        // Same day: append just the end time. Different days: append the full
+        // end date.
+        if (end.Date == ev.Start.Date)
+        {
+            return HasTime(ev)
+                ? start + "–" + end.ToString("HH:mm", German) + " Uhr"
+                : start;
+        }
+
+        var endText = HasTime(ev)
+            ? end.ToString("d. MMMM yyyy, HH:mm", German) + " Uhr"
+            : end.ToString("d. MMMM yyyy", German);
+        return start + " – " + endText;
+    }
+}