Dev extreme Date Format Validation Problem

Edit.cshtml

@Html.LabelFor(model => model.StartDate, htmlAttributes: new { @class = "control-label col-md-2" })

@(Html.DevExtreme().DateBoxFor(m => m.StartDate)

.ID("startDate")

.DisplayFormat(System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern)

.Placeholder(System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern)

.ShowClearButton(true)

.InvalidDateMessage("The date must have the following format: " + System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern))

@Html.ValidationMessageFor(m => m.StartDate, null, new { @class = "text-danger" })

@Html.LabelFor(model => model.EndDate, htmlAttributes: new { @class = "control-label col-md-2" })

@(Html.DevExtreme().DateBoxFor(m => m.EndDate)

.ID("endDate")

.DisplayFormat(System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern)

.Placeholder(System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern)

.ShowClearButton(true)

.InvalidDateMessage("The date must have the following format: " + System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern)

.OnValueChanged("endDateChange"))

Model

[DisplayName("Start date")]

[DataType(DataType.Date)]

[DisplayFormat(DataFormatString = "{0:MM/dd/yyyy}", ApplyFormatInEditMode = true)]

[Required(ErrorMessage = "Start date is required")]

public DateTime? StartDate { get; set; }

[DisplayName("End date")]

[DisplayFormat(DataFormatString = "{0:d}", ApplyFormatInEditMode = true)]

public DateTime? EndDate { get; set; }