DateTime compare

DateTime firstDate = orderDt.AsEnumerable().Select(cols => cols.Field<DateTime>("Ship Date")).OrderBy(p => p.Ticks).FirstOrDefault();
DateTime LastDate = orderDt.AsEnumerable().Select(cols => cols.Field<DateTime>("Ship Date")).OrderByDescending(p => p.Ticks).FirstOrDefault();
                   
    DateTime maxDate = firstDate.AddMonths(1);

    if (maxDate < LastDate)
    {
      // Do something.
    }

Get Year from Date

 var FromYear = DateTime.Parse(item.FromDate.ToString()).Year;