Fix marking item as played

Jellyfin.Api/ModelBinders/LegacyDateTimeModelBinder.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Globalization;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
+using Microsoft.AspNetCore.Mvc.ModelBinding.Binders;
+using Microsoft.Extensions.Logging;
+
+namespace Jellyfin.Api.ModelBinders
+{
+    /// <summary>
+    /// DateTime model binder.
+    /// </summary>
+    public class LegacyDateTimeModelBinder : IModelBinder
+    {
+        // Borrowed from the DateTimeModelBinderProvider
+        private const DateTimeStyles SupportedStyles = DateTimeStyles.AdjustToUniversal | DateTimeStyles.AllowWhiteSpaces;
+        private readonly DateTimeModelBinder _defaultModelBinder;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="LegacyDateTimeModelBinder"/> class.
+        /// </summary>
+        /// <param name="loggerFactory">Instance of the <see cref="ILoggerFactory"/> interface.</param>
+        public LegacyDateTimeModelBinder(ILoggerFactory loggerFactory)
+        {
+            _defaultModelBinder = new DateTimeModelBinder(SupportedStyles, loggerFactory);
+        }
+
+        /// <inheritdoc />
+        public Task BindModelAsync(ModelBindingContext bindingContext)
+        {
+            var valueProviderResult = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
+            if (valueProviderResult.Values.Count == 1)
+            {
+                var dateTimeString = valueProviderResult.FirstValue;
+                // Mark Played Item.
+                if (DateTime.TryParseExact(dateTimeString, "yyyyMMddHHmmss", CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal, out var dateTime))
+                {
+                    bindingContext.Result = ModelBindingResult.Success(dateTime);
+                }
+                else
+                {
+                    return _defaultModelBinder.BindModelAsync(bindingContext);
+                }
+            }
+
+            return Task.CompletedTask;
+        }
+    }
+}