Get Time difference between 2 TimeZones

Hello,
I am trying to get the time difference between the server and the client.
Is this the best way to do it? I think my "TimeSpan totalTimeDifference" part is not right.

thanks

private double GetServerClientTimeDiff(string ClientTimeZoneId)
    {
        // Get the local time zone and the current local time and year.
        TimeZoneInfo clientZone = TimeZoneInfo.FindSystemTimeZoneById(ClientTimeZoneId);
 
        // What is the total difference between server and clients in minutes
        TimeSpan totalTimeDifference = TimeZone.CurrentTimeZone.GetUtcOffset(System.DateTime.Now).Add(clientZone.BaseUtcOffset);
 
        return totalTimeDifference.TotalMinutes;
    }

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