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UtcOffset プロパティ

この TimeZoneInfo オブジェクトで表されるタイムゾーンの UTC（協定世界時）からの時差を返します。
シンタックス
'宣言
 
Public ReadOnly Property UtcOffset As TimeSpan
public TimeSpan UtcOffset {get;}
解説

UtcOffset は現在の時間が UTC（協定世界時）と異なる時間と分数を指定します。この値はグリニッジ標準時を取得するために現在の時間に追加される必要があります。

TimeZone の表示名が GMT に対して相対であるので、UtcOffset は反対の企業で表示されることに注意してください。たとえば、"(GMT-05:00) 東部標準時（US およびカナダ）" は、東部のタイムゾーンが GMT よりも 5 時間前であることを示します。したがって、東部標準時の UtcOffset は +5:00 です。

使用例
Imports Infragistics.Win

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        '	Get an array list of the time zones on this computer
        Dim timeZones As ArrayList = Infragistics.Win.Utilities.GetTimeZones()
        If timeZones Is Nothing Then Return

        '   Iterate the array list and display information on each time zone.
        Dim i As Int32
        Dim crlf As String = vbCrLf
        Dim tab As String = vbTab
        For i = 0 To timeZones.Count - 1

            Dim tzi As TimeZoneInfo = timeZones(i)

            Dim info As String = String.Empty
            info += "Time Zone: " + tzi.StandardName + crlf
            info += tab + "Daylight Name: " + tzi.DaylightName + crlf
            info += tab + "Display Name: " + tzi.DisplayName + crlf
            info += crlf
            info += tab + "UTC Offset: " + tzi.UtcOffset.TotalHours.ToString() + " hours" + crlf
            info += tab + "Additional Daylight Saving Time UTC Offset: " + tzi.DaylightUtcOffset.TotalHours.ToString() + " hours" + crlf
            info += tab + "Additional Standard Time UTC Offset: " + tzi.StandardUtcOffset.TotalHours.ToString() + " hours" + crlf

            If tzi.DaylightDate <> DateTime.MinValue Then
                info += tab + "Daylight savings time begins on " + tzi.DaylightDate.ToLongDateString() + crlf
            End If

            If tzi.StandardDate <> DateTime.MinValue Then
                info += tab + "Standard time begins on " + tzi.StandardDate.ToLongDateString() + crlf
            End If

            info += crlf
            info += tab + "The current date is " + tzi.Today.ToLongDateString() + crlf
            info += tab + "The current time is " + tzi.Now.ToShortTimeString() + crlf
            info += crlf

            Dim isDST As Boolean = tzi.IsDaylightSavingTime(DateTime.Now)
            info += tab + "Daylight savings time is "

            If Not isDST Then
                info += "not "
            End If

            info += "in effect." + crlf

            Dim time As DateTime = New DateTime(DateTime.Today.Year, DateTime.Today.Month, DateTime.Today.Day, 9, 0, 0)
            info += tab + "At 9AM (actual time) in the current time zone, the local time is " + tzi.ToLocalTime(time).ToShortTimeString() + crlf

            Debug.WriteLine(info)
        Next

    End Sub
using Infragistics.Win;
using System.Diagnostics;

		private void button1_Click(object sender, System.EventArgs e)
		{
			//	Get an array list of the time zones on this computer
			ArrayList timeZones = Infragistics.Win.Utilities.GetTimeZones();
			if ( timeZones == null )
				return;

			//	Iterate the array list and display information on each time zone.
			int i;
			string crlf = "\r\n";
			string tab = "\t";
			for ( i = 0; i < timeZones.Count; i ++ )
			{
				TimeZoneInfo tzi = timeZones[i] as TimeZoneInfo;

				string info = string.Empty;
				info += "Time Zone: " + tzi.StandardName + crlf;
				info += tab + "Daylight Name: " + tzi.DaylightName + crlf;
				info += tab + "Display Name: " + tzi.DisplayName + crlf;
				info += crlf;
				info += tab + "UTC Offset: " + tzi.UtcOffset.TotalHours.ToString() + " hours" + crlf;
				info += tab + "Additional Daylight Saving Time UTC Offset: " + tzi.DaylightUtcOffset.TotalHours.ToString() + " hours" + crlf;
				info += tab + "Additional Standard Time UTC Offset: " + tzi.StandardUtcOffset.TotalHours.ToString() + " hours" + crlf;

				if ( tzi.DaylightDate != DateTime.MinValue )
					info += tab + "Daylight savings time begins on " + tzi.DaylightDate.ToLongDateString() + crlf;

				if ( tzi.StandardDate != DateTime.MinValue )
					info += tab + "Standard time begins on " + tzi.StandardDate.ToLongDateString() + crlf;

				info += crlf;
				info += tab + "The current date is " + tzi.Today.ToLongDateString() + crlf;
				info += tab + "The current time is " + tzi.Now.ToShortTimeString() + crlf;
				info += crlf;

				bool isDST = tzi.IsDaylightSavingTime( DateTime.Now );
				info += tab + "Daylight savings time is ";
				
				if ( ! isDST )
					info += "not ";

				info += "in effect." + crlf;

				DateTime time = new DateTime( DateTime.Today.Year, DateTime.Today.Month, DateTime.Today.Day, 9, 0, 0 );
          info += tab + "At 9AM (actual time) in the current time zone, the local time is " + tzi.ToLocalTime(time).ToShortTimeString() + crlf;

				Debug.WriteLine( info );
			}
		}
参照