Have Kendo or Telerik grid date time filters to ignore or not account for the time in the underlying data

CustomDataSourceRequestAttribute.cs

using System.Web.Mvc;
using MyProject.ModelBinders;
using Kendo.Mvc.UI;

namespace MyProject.CustomAttributes
{
	public class CustomDataSourceRequestAttribute : DataSourceRequestAttribute
	{
		public override IModelBinder GetBinder()
		{
			return new CustomDataSourceRequestModelBinder();
		}
	}
}

CustomDataSourceRequestModelBinder.cs

using System;
using System.Linq;
using System.Web.Mvc;
using Kendo.Mvc;
using Kendo.Mvc.UI;

namespace MyProject.ModelBinders
{
	/// <summary>
	/// DateTime filtering is horribly unintuitive in Kendo Grids when a non-default (00:00:00) time is attached
	/// to the grid's datetime data. We use this custom model binder to transform the grid filters to return 
	/// results that ignore the attached time, leading to intuitive results that make users happy.
	/// 
	/// To use the code, substitute the [DataSourceRequest] attribute for [CustomDataSourceRequest] in your MVC controller
	///
	/// If you will be comparing UTC datetimes, you will need to add ".ToUniversalTime()" to the end of all DateTime constructors
	/// inside the switch statement below. 
	/// </summary>
	public class CustomDataSourceRequestModelBinder : IModelBinder
	{
		public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
		{
			// Get an instance of the original kendo model binder and call the binding method
			var baseBinder = new DataSourceRequestModelBinder();
			var request = (DataSourceRequest)baseBinder.BindModel(controllerContext, bindingContext);

			if (request.Filters != null && request.Filters.Count > 0)
			{
				var transformedFilters = request.Filters.Select(TransformFilterDescriptors).ToList();
				request.Filters = transformedFilters;
			}

			return request;
		}

		private IFilterDescriptor TransformFilterDescriptors(IFilterDescriptor filter)
		{
			if (filter is CompositeFilterDescriptor)
			{
				var compositeFilterDescriptor = filter as CompositeFilterDescriptor;
				var transformedCompositeFilterDescriptor = new CompositeFilterDescriptor { LogicalOperator = compositeFilterDescriptor.LogicalOperator };
				foreach (var filterDescriptor in compositeFilterDescriptor.FilterDescriptors)
				{
					transformedCompositeFilterDescriptor.FilterDescriptors.Add(TransformFilterDescriptors(filterDescriptor));
				}
				return transformedCompositeFilterDescriptor;
			}
			if (filter is FilterDescriptor)
			{
				var filterDescriptor = filter as FilterDescriptor;
				if (filterDescriptor.Value is DateTime)
				{
					var value = (DateTime)filterDescriptor.Value;
					switch (filterDescriptor.Operator)
					{
						case FilterOperator.IsEqualTo:
							//convert the "is equal to <date><time>" filter to a "is greater than or equal to <date> 00:00:00" AND "is less than <date + 1day> 00:00:00"
							var isEqualCompositeFilterDescriptor = new CompositeFilterDescriptor { LogicalOperator = FilterCompositionLogicalOperator.And };
							isEqualCompositeFilterDescriptor.FilterDescriptors.Add(new FilterDescriptor(filterDescriptor.Member,
								FilterOperator.IsGreaterThanOrEqualTo, new DateTime(value.Year, value.Month, value.Day, 0, 0, 0)));
							isEqualCompositeFilterDescriptor.FilterDescriptors.Add(new FilterDescriptor(filterDescriptor.Member,
								FilterOperator.IsLessThan, new DateTime(value.Year, value.Month, value.Day, 0, 0, 0).AddDays(1)));
							return isEqualCompositeFilterDescriptor;

						case FilterOperator.IsNotEqualTo:
							//convert the "is not equal to <date><time>" filter to a "is less than <date> 00:00:00" OR "is greater than or equal to <date + 1day> 00:00:00"
							var notEqualCompositeFilterDescriptor = new CompositeFilterDescriptor { LogicalOperator = FilterCompositionLogicalOperator.Or };
							notEqualCompositeFilterDescriptor.FilterDescriptors.Add(new FilterDescriptor(filterDescriptor.Member,
								FilterOperator.IsLessThan, new DateTime(value.Year, value.Month, value.Day, 0, 0, 0)));
							notEqualCompositeFilterDescriptor.FilterDescriptors.Add(new FilterDescriptor(filterDescriptor.Member,
								FilterOperator.IsGreaterThanOrEqualTo, new DateTime(value.Year, value.Month, value.Day, 0, 0, 0).AddDays(1)));
							return notEqualCompositeFilterDescriptor;
							
						case FilterOperator.IsGreaterThanOrEqualTo:
							//convert the "is greater than or equal to <date><time>" filter to a "is greater than or equal to <date> 00:00:00"
							filterDescriptor.Value = new DateTime(value.Year, value.Month, value.Day, 0, 0, 0);
							return filterDescriptor;
							
						case FilterOperator.IsGreaterThan:
							//convert the "is greater than <date><time>" filter to a "is greater than or equal to <date + 1day> 00:00:00"
							var greaterThanFilterDescriptor = new FilterDescriptor(filterDescriptor.Member, FilterOperator.IsGreaterThanOrEqualTo, new DateTime(value.Year, value.Month, value.Day, 0, 0, 0).AddDays(1));
							return greaterThanFilterDescriptor;
							
						case FilterOperator.IsLessThanOrEqualTo:
							//convert the "is less than or equal to <date><time>" filter to a "is less than <date + 1day> 00:00:00"
							var lessThanEqualToFilterDescriptor = new FilterDescriptor(filterDescriptor.Member, FilterOperator.IsLessThan, new DateTime(value.Year, value.Month, value.Day, 0, 0, 0).AddDays(1));
							return lessThanEqualToFilterDescriptor;
						
						case FilterOperator.IsLessThan:
							//convert the "is less than <date><time>" filter to a "is less than <date> 00:00:00"
							filterDescriptor.Value = new DateTime(value.Year, value.Month, value.Day, 0, 0, 0);
							return filterDescriptor;

						case FilterOperator.IsNull:
							return filterDescriptor;

						case FilterOperator.IsNotNull:
							return filterDescriptor;

						default:
							throw new Exception(string.Format("Filter operator '{0}' is not supported for DateTime member '{1}'", filterDescriptor.Operator, filterDescriptor.Member));
					}
				}
			}
			return filter;
		}
	}
}

ExampleController.cs

namespace MyProject.Controllers
{
	public class ExampleController : Controller
	{
		public ActionResult ReadGridData([CustomDataSourceRequest] DataSourceRequest request)
		{
			var myGridData = _myDataRepository.GetData();
			return Json(myGridData.ToDataSourceResult(request));
		}
	}
}

LICENSE

The MIT License (MIT)

Copyright (c) 2015 Crowbar Solutions Inc.

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