How to access stored procedure from DTO

[DataMember(Name = "g7")]
public DateTime DateEffectiveIn
{
    get
    {
        if (Environment.MachineName != StationCreatedAt && _readCount == 0)
        {
            RegenerateServerDate(); //calling the function here
            _readCount++;
        }

        return _dateEffectiveIn;
    }
    set
    {
        _dateEffectiveIn = value;
    }
}


public void RegenerateServerDate()
{
    if (ServerDateTimeSource != string.Empty)
    {
       string connetionString =           ConfigurationManager.ConnectionStrings["abcString"].ConnectionString;
       SqlConnection connection  ;
       SqlCommand command ;

       connection = new SqlConnection(connetionString);

       connection.Open();

       command = new SqlCommand("usp_GetUTCDate_Select", connection);
       command.CommandType = CommandType.StoredProcedure;

       DateTime DateUtc = command.ExecuteScalar(); //only one data returned

       command.Dispose();
       connection.Close();
           

       this.DateEffectiveIn = DateUtc;
       this.DateCreated = DateUtc;
       this.DateLastModified = DateUtc;
    
    }
    else
    {
       DateTime dateTime = DateHelper.ConvertToUtc(DateTime.Now);
       this.DateEffectiveIn = dateTime;
       this.DateCreated = dateTime;
       this.DateLastModified = dateTime;
    }
}