DateTimeModelBinderHelper.cs

public static class Helper
{
    private static readonly string[] CUSTOM_DATE_FORMATS = new string[]
    {
        "yyyyMMddTHHmmssZ",
        "yyyyMMddTHHmmZ",
        "yyyyMMddTHHmmss",
        "yyyyMMddTHHmm",
        "yyyyMMddHHmmss",
        "yyyyMMddHHmm",
        "yyyyMMdd",
        "yyyy-MM-ddTHH-mm-ss",
        "yyyy-MM-dd-HH-mm-ss",
        "yyyy-MM-dd-HH-mm",
        "yyyy-MM-dd",
        "MM-dd-yyyy",
        "dd/MM/yyyy"
    };

    public static DateTime? ParseDateTime(
        string dateToParse,
        string[] formats = null,
        IFormatProvider provider = null,
        DateTimeStyles styles = DateTimeStyles.None)
    {
        if (formats == null || !formats.Any())
        {
            formats = CUSTOM_DATE_FORMATS;
        }

        DateTime validDate;

        foreach (var format in formats)
        {
            if (format.EndsWith("Z"))
            {
                if (DateTime.TryParseExact(dateToParse, format, provider, DateTimeStyles.AssumeUniversal, out validDate))
                {
                    return validDate;
                }
            }

            if (DateTime.TryParseExact(dateToParse, format, provider, styles, out validDate))
            {
                return validDate;
            }
        }

        return null;
    }

    public static bool IsNullableType(Type type)
    {
        return type.IsGenericType && type.GetGenericTypeDefinition().Equals(typeof(Nullable<>));
    }
}