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TimeZone.IsDaylightSavingTime Method (DateTime, DaylightTime)

Returns a value indicating whether the specified date and time is within the specified daylight saving time period.

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

public static bool IsDaylightSavingTime(
	DateTime time,
	DaylightTime daylightTimes


Type: System.DateTime

A date and time.

Type: System.Globalization.DaylightTime

A daylight saving time period.

Return Value

Type: System.Boolean
true if time is in daylightTimes; otherwise, false.


daylightTimes is null.

The TimeZoneInfo.IsDaylightSavingTime method provides the same functionality as this overload of the IsDaylightSavingTime method. Whenever possible, use the TimeZoneInfo.IsDaylightSavingTime method.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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