Compare two dates in C#

This post will discuss how to compare two dates in C#.

1. Using `DateTime.Compare()` method

The DateTime.Compare() method is commonly used in C# to compare two instances of DateTime object. It returns an integer value based on the comparison result – indicating whether the first date is earlier than, the same as, or later than the second date. i.e.,

value < 0, if first date is earlier than the second date.
value = 0, if first date is same as the second date.
value > 0, if first date is later than the second date.

The following example illustrates the usage of the DateTime.Compare() method for the comparison of two DateTime objects.

using System;

public class Example

{

public static void Main()

{

var dt1 = DateTime.Today;

var dt2 = DateTime.Today.AddDays(10);

int result = DateTime.Compare(dt1, dt2);

if (result < 0) {

Console.WriteLine("First Date is earlier than the second date");

}

else if (result > 0) {

Console.WriteLine("First Date is later than the second date");

}

else {

Console.WriteLine("First Date is same as the second date");

}

Download Run Code

Output:

First Date is earlier than the second date

2. Using Relational Operators

Alternatively, you can use the relational operators – <, '<', <=, '<=', '==', '=!', etc. to compare two DateTime instances in C#. The following example provides an illustration.

using System;

public class Example

{

public static void Main()

{

DateTime dt1 = DateTime.Now;

DateTime dt2 = DateTime.Now.AddDays(10);

if (dt1.Date < dt2.Date) {

Console.WriteLine("First Date is earlier than the second date");

}

else if (dt1.Date > dt2.Date) {