how to compare two dates c# code example

Example 1: how to compare datetime in c#

DateTime.Compare(datetime1, datetime2);
/*
datetime1 before datetime2 = -ve
datetime1 equal datetime2 = 0
datetime1 after datetime2 = +ve
*/

Example 2: c# how does comparing datetime work

using System;
public class Demo {
   public static void Main(){
      DateTime d1 = new DateTime(2019, 12, 20, 6, 20, 40);
      DateTime d2 = new DateTime(2019, 11, 20, 6, 20, 40);
      Console.WriteLine("DateTime 1 = {0:dd} {0:y}, {0:hh}:{0:mm}:{0:ss} ", d1);
      Console.WriteLine("DateTime 2 = {0:dd} {0:y}, {0:hh}:{0:mm}:{0:ss} ", d2);
      int res = DateTime.Compare(d1, d2);
      // returns equal to 0 since d1 is equal to d2
      Console.WriteLine(res);
   }
}

Example 3: c# how to compare 2 dates without time

if(dateTime1.Date == dateTime2.Date)
  // or 
if (dateTime1.Date.CompareTo(dateTime2.Date))
{
}