using System;

using System.Globalization;

​

public class DicomDateTimeParser

{

    public static DateTime ParseDicomDateTime(string dicomDateTime)

    {

        // Define the possible formats of the DICOM DT value

        string[] formats = {

            "yyyyMMddHHmmss",

            "yyyyMMddHHmm",

            "yyyyMMddHH",

            "yyyyMMdd",

            "yyyyMM",

            "yyyy",

            "yyyyMMddHHmmss.f",

            "yyyyMMddHHmmss.ff",

            "yyyyMMddHHmmss.fff",

            "yyyyMMddHHmmss.ffff",

            "yyyyMMddHHmmss.fffff",

            "yyyyMMddHHmmss.ffffff",

            "yyyyMMddHHmmsszzz",

            "yyyyMMddHHmmzzz",

            "yyyyMMddHHzzz",

            "yyyyMMddzzz",

            "yyyyMMzzz",

            "yyyyzzz",

            "yyyyMMddHHmmss.fzzz",

            "yyyyMMddHHmmss.ffzzz",

            "yyyyMMddHHmmss.fffzzz",

            "yyyyMMddHHmmss.ffffzzz",

            "yyyyMMddHHmmss.fffffzzz",

            "yyyyMMddHHmmss.ffffffzzz"

        };

​

        // Replace commas with dots for fractional seconds

        dicomDateTime = dicomDateTime.Replace(",", ".");

​

        // Parse the datetime using the defined formats

        if (DateTime.TryParseExact(dicomDateTime, formats, CultureInfo.InvariantCulture, DateTimeStyles.AssumeLocal, out DateTime parsedDateTime))

        {

            return parsedDateTime;

        }

        else

        {

            throw new FormatException("Invalid DICOM datetime format.");

        }

    }

​

    public static void Main()

    {

        string[] dicomDTs = {

            "20230115123045.123456+0100",

            "20230115123045",

            "202301151230",

            "2023011512",

            "20230115",

            "202301",

            "2023",

            "20230115123045,123456-0500"

        };

​

        foreach (var dicomDT in dicomDTs)

        {

            try

            {

                DateTime dt = ParseDicomDateTime(dicomDT);

                Console.WriteLine($"Parsed DateTime for {dicomDT}: " + dt.ToString("o"));

            }

            catch (FormatException ex)

            {

                Console.WriteLine($"Error parsing {dicomDT}: " + ex.Message);

            }

        }

    }

}

​