private DateTime ParseDateString(string datestr)
{
int year = int.Parse(datestr.Substring(0, 4));
int month = int.Parse(datestr.Substring(4, 2));
int day = int.Parse(datestr.Substring(6, 2));
int hour = int.Parse(datestr.Substring(9, 2));
int minute = int.Parse(datestr.Substring(11, 2));
return new DateTime(year, month, day, hour, minute, 0);
}