How to subtract a datetime from another datetime?

Question

How do I subtract two DateTime values from another DateTime value and have the result saved to a double?

Answer 1

var Date1 = new DateTime(2018, 12, 15);
var Date2 = new DateTime(2019, 1, 1);
TimeSpan result1 = Date2.Subtract(Date1);
Console.WriteLine(result1);

//To calculate difference between two dates use TotalDays() method
double result2 = Date2.Subtract(Date1).TotalDays;
Console.WriteLine(result2);

//Output:
17.00:00:00
17

Note:

• Date2 should be greater than Date1 or else the method will return a negative value
• Subtract() method returns value of type TimeSpan while TotalDays() method returns value of type double