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Generic DateTime List Comparison in C#
List<DateTime> **PreviousDates** = //Some List of Dates

DateTime start = new DateTime(GivenDate.Year, GivenDate.Month, 1);
DateTime end = start.AddMonths(1);

List<DateTime> inside =
  PreviousDates
  .Where(d => d >= start && d < end)
  .ToList();

DateTime currentDate = DateTime.Now;
var filteredDates = previousDates.Where(
    d => d.Year == currentDate.Year && d.Month == currentDate.Month);

PreviousDates.Where(d => d.Month == month && d.Year == year);

DateTime criteria = DateTime.Today;
List<DateTime> filtered = previousDates.Where(dt => dt.Month == criteria.Month && dt.Year == criteria.Year).ToList();

previousDates.Where(d => d.Month == refDate.Month && d.Year == refDate.Year);