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// <Snippet1>
using System;
using System.Collections.ObjectModel;
public class TimeOffsets
{
public static void Main()
{
DateTime thisDate = new DateTime(2007, 3, 10, 0, 0, 0);
DateTime dstDate = new DateTime(2007, 6, 10, 0, 0, 0);
DateTimeOffset thisTime;
thisTime = new DateTimeOffset(dstDate, new TimeSpan(-7, 0, 0));
ShowPossibleTimeZones(thisTime);
thisTime = new DateTimeOffset(thisDate, new TimeSpan(-6, 0, 0));
ShowPossibleTimeZones(thisTime);
thisTime = new DateTimeOffset(thisDate, new TimeSpan(+1, 0, 0));
ShowPossibleTimeZones(thisTime);
}
private static void ShowPossibleTimeZones(DateTimeOffset offsetTime)
{
TimeSpan offset = offsetTime.Offset;
ReadOnlyCollection<TimeZoneInfo> timeZones;
Console.WriteLine("{0} could belong to the following time zones:",
offsetTime.ToString());
// Get all time zones defined on local system
timeZones = TimeZoneInfo.GetSystemTimeZones();
// Iterate time zones
foreach (TimeZoneInfo timeZone in timeZones)
{
// Compare offset with offset for that date in that time zone
if (timeZone.GetUtcOffset(offsetTime.DateTime).Equals(offset))
Console.WriteLine(" {0}", timeZone.DisplayName);
}
Console.WriteLine();
}
}
// This example displays the following output to the console:
// 6/10/2007 12:00:00 AM -07:00 could belong to the following time zones:
// (GMT-07:00) Arizona
// (GMT-08:00) Pacific Time (US & Canada)
// (GMT-08:00) Tijuana, Baja California
//
// 3/10/2007 12:00:00 AM -06:00 could belong to the following time zones:
// (GMT-06:00) Central America
// (GMT-06:00) Central Time (US & Canada)
// (GMT-06:00) Guadalajara, Mexico City, Monterrey - New
// (GMT-06:00) Guadalajara, Mexico City, Monterrey - Old
// (GMT-06:00) Saskatchewan
//
// 3/10/2007 12:00:00 AM +01:00 could belong to the following time zones:
// (GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna
// (GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague
// (GMT+01:00) Brussels, Copenhagen, Madrid, Paris
// (GMT+01:00) Sarajevo, Skopje, Warsaw, Zagreb
// (GMT+01:00) West Central Africa
// </Snippet1>