IsDaylightSavingTime Method (DateTimeOffset)
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TimeZoneInfo.IsDaylightSavingTime Method (DateTimeOffset)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Indicates whether a specified date and time falls in the range of daylight saving time for the time zone of the current TimeZoneInfo object.

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

public bool IsDaylightSavingTime(
	DateTimeOffset dateTimeOffset
)

Parameters

dateTimeOffset
Type: System.DateTimeOffset
A date and time value.

Return Value

Type: System.Boolean
true if the dateTimeOffset parameter is a daylight saving time; otherwise, false.

The return value of TimeZoneInfo.IsDaylightSavingTime is affected by the relationship between the time zone represented by the TimeZoneInfo object and the Offset property of the dateTimeOffset parameter. If dateTimeOffset does not correspond to the current time zone's offset from Coordinated Universal Time (UTC), the method converts that time to the time in the current time zone. It then determines whether that date and time is a daylight saving time.

If the time zone represented by the TimeZoneInfo object does not support daylight saving time, the method always returns false.

Version Notes

XNA Framework

 When this method is used in the XNA Framework, it throws a NotSupportedException exception.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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