--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MetroWpf/MetroWpf.Framework/Extensions/DateTimeOffsetExtensions.cs	Mon Mar 12 23:05:21 2012 +0800
@@ -0,0 +1,91 @@
+using System;
+
+namespace MetroWpf
+{
+    /// <summary>
+    /// Extension methods for the DateTimeOffset data type.
+    /// </summary>
+    public static class DateTimeOffsetExtensions
+    {
+        #region · Extensions ·
+
+        /// <summary>
+        /// Indicates whether the date is today.
+        /// </summary>
+        /// <param name="dto">The date.</param>
+        /// <returns>
+        /// 	<c>true</c> if the specified date is today; otherwise, <c>false</c>.
+        /// </returns>
+        public static bool IsToday(this DateTimeOffset dto)
+        {
+            return (dto.Date.IsToday());
+        }
+
+        /// <summary>
+        /// Sets the time on the specified DateTimeOffset value using the local system time zone.
+        /// </summary>
+        /// <param name="date">The base date.</param>
+        /// <param name="hours">The hours to be set.</param>
+        /// <param name="minutes">The minutes to be set.</param>
+        /// <param name="seconds">The seconds to be set.</param>
+        /// <returns>The DateTimeOffset including the new time value</returns>
+        public static DateTimeOffset SetTime(this DateTimeOffset date, int hours, int minutes, int seconds)
+        {
+            return date.SetTime(new TimeSpan(hours, minutes, seconds));
+        }
+
+        /// <summary>
+        /// Sets the time on the specified DateTime value using the local system time zone.
+        /// </summary>
+        /// <param name="date">The base date.</param>
+        /// <param name="time">The TimeSpan to be applied.</param>
+        /// <returns>
+        /// The DateTimeOffset including the new time value
+        /// </returns>
+        public static DateTimeOffset SetTime(this DateTimeOffset date, TimeSpan time)
+        {
+            return date.SetTime(time, null);
+        }
+
+        /// <summary>
+        /// Sets the time on the specified DateTime value using the specified time zone.
+        /// </summary>
+        /// <param name="date">The base date.</param>
+        /// <param name="time">The TimeSpan to be applied.</param>
+        /// <param name="localTimeZone">The local time zone.</param>
+        /// <returns>/// The DateTimeOffset including the new time value/// </returns>
+        public static DateTimeOffset SetTime(this DateTimeOffset date, TimeSpan time, TimeZoneInfo localTimeZone)
+        {
+            var localDate = date.ToLocalDateTime(localTimeZone);
+
+            localDate.SetTime(time);
+            
+            return localDate.ToDateTimeOffset(localTimeZone);
+        }
+
+        /// <summary>
+        /// Converts a DateTimeOffset into a DateTime using the local system time zone.
+        /// </summary>
+        /// <param name="dateTimeUtc">The base DateTimeOffset.</param>
+        /// <returns>The converted DateTime</returns>
+        public static DateTime ToLocalDateTime(this DateTimeOffset dateTimeUtc)
+        {
+            return dateTimeUtc.ToLocalDateTime(null);
+        }
+
+        /// <summary>
+        /// Converts a DateTimeOffset into a DateTime using the specified time zone.
+        /// </summary>
+        /// <param name="dateTimeUtc">The base DateTimeOffset.</param>
+        /// <param name="localTimeZone">The time zone to be used for conversion.</param>
+        /// <returns>The converted DateTime</returns>
+        public static DateTime ToLocalDateTime(this DateTimeOffset dateTimeUtc, TimeZoneInfo localTimeZone)
+        {
+            localTimeZone = (localTimeZone ?? TimeZoneInfo.Local);
+
+            return TimeZoneInfo.ConvertTime(dateTimeUtc, localTimeZone).DateTime;
+        }
+
+        #endregion
+    }
+}
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