Utilizing SharePoint Form Controls (like OWSDateField)

using System;
using System.Text;
using System.Web.UI;

using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using Microsoft.SharePoint.Utilities;

namespace OWSControls
{
    public class OWSDateField : OWSBase
    {
        #region construction

        /// <summary>
        /// Default constructor
        /// </summary>
        public OWSDateField() { }

        #endregion

        #region custom properties

        /// <summary>
        /// Gets or set the number date in a .NET date time format. 
        /// </summary>
        public DateTime DateTime
        {
            get { return SPUtility.CreateSystemDateTimeFromXmlDataDateTimeFormat(Value); }
            set { Value = SPUtility.CreateISO8601DateTimeFromSystemDateTime(value); }
        }

        /// <summary>
        /// Gets or set whether or not this control presents a date only value.
        /// </summary>
        public bool DateOnly
        {
            get
            {
                if (ViewState["DateOnly"] == null)
                    DateOnly = false;
                return (bool)ViewState["DateOnly"];
            }
            set { ViewState["DateOnly"] = value; }
        }

        /// <summary>
        /// Gets or set whether or not to hide descriptions.
        /// </summary>
        public bool HideDescription
        {
            get
            {
                if (ViewState["HideDescription"] == null)
                    HideDescription = false;
                return (bool)ViewState["HideDescription"];
            }
            set { ViewState["HideDescription"] = value; }
        }

        #endregion

        #region overridden properties

        /// <summary>
        /// Gets the test string representation of the date.
        /// </summary>
        public override string Text
        {
            get 
            { 
                if (DateOnly)
                    return DateTime.ToString("dddd, MMMM d, yyyy");
                return DateTime.ToString("dddd, MMMM d, yyyy h:mm tt");
            } 
        }

        #endregion

        #region overridden methods

        /// <summary>
        /// Renders the OWS Control
        /// </summary>
        /// <param name="wtr">writes out the text control information</param>
        protected override void Render(HtmlTextWriter wtr)
        {
            wtr.Write(
                "<SCRIPT>" +
				"fld=new DateField(frm, '{0}', '{1}', '{2}'); " +
				"fld.fDateOnly = {3}; " +
				"fld.fHideDescription = {4}; " +
				"fld.caltype = 1; " +
				"fld.fRequired = {5}; " +
				"fld.BuildUI(); " +
                "</SCRIPT>",
                UniqueID,
                Display,
                JavaScriptValue,
                DateOnly.ToString().ToLower(),
                HideDescription.ToString().ToLower(),
                Required.ToString().ToLower()
            );
        }
        #endregion

    }
}