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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.timezoneinfo.converttimebysystemtimezoneid below:

TimeZoneInfo.ConvertTimeBySystemTimeZoneId Method (System) | Microsoft Learn

Source:: TimeZoneInfo.cs

Source:: TimeZoneInfo.cs

Source:: TimeZoneInfo.cs

Source:: TimeZoneInfo.cs

Converts a time from one time zone to another based on time zone identifiers.

public:
 static DateTime ConvertTimeBySystemTimeZoneId(DateTime dateTime, System::String ^ sourceTimeZoneId, System::String ^ destinationTimeZoneId);

public static DateTime ConvertTimeBySystemTimeZoneId(DateTime dateTime, string sourceTimeZoneId, string destinationTimeZoneId);

static member ConvertTimeBySystemTimeZoneId : DateTime * string * string -> DateTime

Public Shared Function ConvertTimeBySystemTimeZoneId (dateTime As DateTime, sourceTimeZoneId As String, destinationTimeZoneId As String) As DateTime

Parameters

dateTime: DateTime

The date and time to convert.

sourceTimeZoneId: String

The identifier of the source time zone.

destinationTimeZoneId: String

The identifier of the destination time zone.

Returns

The date and time in the destination time zone that corresponds to the dateTime parameter in the source time zone.

Exceptions

The Kind property of the dateTime parameter does not correspond to the source time zone.

-or-

dateTime is an invalid time in the source time zone.

sourceTimeZoneId is null.

-or-

destinationTimeZoneId is null.

The time zone identifiers were found, but the registry data is corrupted.

The user does not have the permissions required to read from the registry keys that hold time zone data.

The sourceTimeZoneId identifier was not found on the local system.

-or-

The destinationTimeZoneId identifier was not found on the local system.

Examples

The following example uses the TimeZoneInfo.ConvertTimeBySystemTimeZoneId(DateTime, String, String) method to display the time that corresponds to the local system time in eight cities of the world.

DateTime currentTime = DateTime.Now;
Console.WriteLine("Current Times:");
Console.WriteLine();
Console.WriteLine("Los Angeles: {0}", 
                  TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "Pacific Standard Time"));
Console.WriteLine("Chicago: {0}", 
                  TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "Central Standard Time"));
Console.WriteLine("New York: {0}", 
                  TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "Eastern Standard Time"));
Console.WriteLine("London: {0}", 
                  TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "GMT Standard Time"));
Console.WriteLine("Moscow: {0}", 
                  TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "Russian Standard Time"));
Console.WriteLine("New Delhi: {0}", 
                  TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "India Standard Time"));
Console.WriteLine("Beijing: {0}", 
                  TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "China Standard Time"));
Console.WriteLine("Tokyo: {0}", 
                  TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "Tokyo Standard Time"));

let currentTime = DateTime.Now
printfn "Current Times:\n"
printfn $"""Los Angeles: {TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "Pacific Standard Time")}"""
printfn $"""Chicago: {TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "Central Standard Time")}"""
printfn $"""New York: {TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "Eastern Standard Time")}"""
printfn $"""London: {TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "GMT Standard Time")}"""
printfn $"""Moscow: {TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "Russian Standard Time")}"""
printfn $"""New Delhi: {TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "India Standard Time")}"""
printfn $"""Beijing: {TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "China Standard Time")}"""
printfn $"""Tokyo: {TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "Tokyo Standard Time")}"""

Dim currentTime As Date = Date.Now
Console.WriteLine("Current Times:")
Console.WriteLine()
Console.WriteLine("Los Angeles: {0}", _
                  TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "Pacific Standard Time"))
Console.WriteLine("Chicago: {0}", _ 
                  TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "Central Standard Time"))
Console.WriteLine("New York: {0}", _
                  TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "Eastern Standard Time"))
Console.WriteLine("London: {0}", _
                  TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "GMT Standard Time"))
Console.WriteLine("Moscow: {0}", _
                  TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "Russian Standard Time"))
Console.WriteLine("New Delhi: {0}", _
                  TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "India Standard Time"))
Console.WriteLine("Beijing: {0}", _
                  TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "China Standard Time"))
Console.WriteLine("Tokyo: {0}", _
                  TimeZoneInfo.ConvertTimeBySystemTimeZoneId(currentTime, TimeZoneInfo.Local.Id, "Tokyo Standard Time"))

Remarks

When performing the conversion, the ConvertTimeBySystemTimeZoneId method applies any adjustment rules in effect in the destinationTimeZoneId time zone.

Although it is similar to the TimeZoneInfo.ConvertTime(DateTime, TimeZoneInfo, TimeZoneInfo) method, you can use TimeZoneInfo.ConvertTimeBySystemTimeZoneId(DateTime, String, String) to specify the source and destination time zones using their identifiers instead of their TimeZoneInfo objects. This method is most useful when you must convert a time without retrieving the time zone object that corresponds to it and you do not need to know whether the converted time is standard or daylight saving time.

This method retrieves the time zones whose identifiers are the sourceTimeZoneId and destinationTimeZoneId parameters from the registry on Windows systems and from the ICU Library on Linux and macOS. It cannot retrieve time zone objects that are created using the CreateCustomTimeZone method.

The value of the Kind property of the dateTime parameter must correspond to the sourceTimeZoneId parameter, as the following table shows.

Because it relies on calls to the FindSystemTimeZoneById method, the ConvertTimeBySystemTimeZoneId method performs a case-insensitive search to locate the time zones that correspond to sourceTimeZoneId and destinationTimeZoneId.

If the value of the dateTime parameter is an ambiguous time in the source time zone, it is interpreted as a standard time. If the dateTime parameter is an invalid time in the source time zone, this method throws an ArgumentException.

The Kind property of the returned DateTime value is set to DateTimeKind.Unspecified unless the destination time zone is Coordinated Universal Time (UTC), in which case it is set to DateTimeKind.Utc.