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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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0
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