using System;

using System.Globalization;

public class Program

{

    public static void Main(string[] args)

    {

        string[] inputs = { "04:47(CEST)", "14:47(CET)" };

        DateTime?[] utcTimes = Array.ConvertAll(inputs, TryParseUtcTime);

        foreach(DateTime? dt in utcTimes)

            Console.WriteLine(dt?.ToString());

    }

​

    private static DateTime? TryParseUtcTime(string input)

    {

        input = input.Replace("(CEST)", " +2").Replace("(CET)", " +1");

        if(DateTime.TryParseExact(input, "HH:mm z", DateTimeFormatInfo.InvariantInfo, DateTimeStyles.AdjustToUniversal, out DateTime dt))

        {

            return dt;

        }

​

        return null;

    }

}