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TimeZone.GetDaylightChanges Method

Updated: December 2011

Returns the daylight saving time period for a particular year.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public abstract DaylightTime GetDaylightChanges(
	int year


Type: System.Int32
The year that the daylight saving time period applies to.

Return Value

Type: System.Globalization.DaylightTime
A System.Globalization.DaylightTime object that contains the start and end date for daylight saving time in year.


year is less than 1 or greater than 9999.

Only one daylight saving time period per year is supported.

If daylight saving time is not used in the current time zone, the return value is a DaylightTime object, where the value of Start and End is DateTime.MinValue, and the value of DaylightTime.Delta is a TimeSpan initialized to 0 ticks.

Notes to Callers

Because the TimeZone class supports only one daylight saving time adjustment rule, the GetDaylightChanges method applies the current adjustment rule to any year, regardless of whether the adjustment rule actually applies to that year. Assuming that the operating system itself has accurate data for a particular year, a more accurate result is available by working with the array of TimeZoneInfo.AdjustmentRule objects returned by the TimeZoneInfo.GetAdjustmentRules method. The Start, End, and Delta properties correspond to the TimeZoneInfo.AdjustmentRule.DateStart, TimeZoneInfo.AdjustmentRule.DateEnd, and TimeZoneInfo.AdjustmentRule.DaylightDelta properties.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.




December 2011

Removed the example.

Content bug fix.