TimeZoneInfo.DaylightName Property

Definition

Namespace:

System

Assembly:

System.Runtime.dll

Source:

TimeZoneInfo.cs

Gets the display name for the current time zone's daylight saving time.

public:
 property System::String ^ DaylightName { System::String ^ get(); };

public string DaylightName { get; }

member this.DaylightName : string

Public ReadOnly Property DaylightName As String

Property Value

String

The display name for the time zone's daylight saving time.

Examples

The following example defines a method named DisplayDateWithTimeZoneName that uses the IsDaylightSavingTime(DateTime) method to determine whether to display a time zone's standard time name or daylight saving time name.

private void DisplayDateWithTimeZoneName(DateTime date1, TimeZoneInfo timeZone)
{
   Console.WriteLine("The time is {0:t} on {0:d} {1}", 
                     date1, 
                     timeZone.IsDaylightSavingTime(date1) ?
                         timeZone.DaylightName : timeZone.StandardName);   
}
// The example displays output similar to the following:
//    The time is 1:00 AM on 4/2/2006 Pacific Standard Time

let displayDateWithTimeZoneName (date1: DateTime) (timeZone: TimeZoneInfo) =
    printfn $"The time is {date1:t} on {date1:d} {if timeZone.IsDaylightSavingTime date1 then timeZone.DaylightName else timeZone.StandardName}" 
// The example displays output similar to the following:
//    The time is 1:00 AM on 4/2/2006 Pacific Standard Time

Private Sub DisplayDateWithTimeZoneName(date1 As Date, timeZone As TimeZoneInfo)
   Console.WriteLine("The time is {0:t} on {0:d} {1}", _
                     date1, _
                     IIf(timeZone.IsDaylightSavingTime(date1), _
                         timezone.DaylightName, timezone.StandardName))   
End Sub
' The example displays output similar to the following:
'    The time is 1:00 AM on 4/2/2006 Pacific Standard Time

Remarks

The display name is localized based on the culture installed with the Windows operating system.

A DaylightName property whose value is not String.Empty or null does not necessarily indicate that the time zone supports daylight saving time. To determine whether the time zone supports daylight saving time, check the value of its SupportsDaylightSavingTime property.

In most cases, the DaylightName property of system-defined time zones is not String.Empty or null. However, the DaylightName property of custom time zones can be set to String.Empty. This occurs when custom time zones are created by the TimeZoneInfo.CreateCustomTimeZone(String, TimeSpan, String, String) or the TimeZoneInfo.CreateCustomTimeZone(String, TimeSpan, String, String, String, TimeZoneInfo+AdjustmentRule[], Boolean) overload and the disableDaylightSavingTime parameter is true. Therefore, your code should never assume that the value of the DaylightName property is not null or empty.

The DaylightName property is equivalent to the DaylightName property of the TimeZone class.