c# TimeSpan?

https://docs.microsoft.com/en-us/dotnet/api/system.timespan?view=netcore-3.1

calculate difference between datetime

// Define two dates.

DateTime date1 = new DateTime(2010, 1, 1, 8, 0, 15);

DateTime date2 = new DateTime(2010, 8, 18, 13, 30, 30);

// Calculate the interval between the two dates.

TimeSpan interval = date2 - date1;

Console.WriteLine("{0} - {1} = {2}", date2, date1, interval.ToString());

// Display individual properties of the resulting TimeSpan object.

Console.WriteLine(" {0,-35} {1,20}", "Value of Days Component:", interval.Days);

Console.WriteLine(" {0,-35} {1,20}", "Total Number of Days:", interval.TotalDays);

Console.WriteLine(" {0,-35} {1,20}", "Value of Hours Component:", interval.Hours);

Console.WriteLine(" {0,-35} {1,20}", "Total Number of Hours:", interval.TotalHours);

Console.WriteLine(" {0,-35} {1,20}", "Value of Minutes Component:", interval.Minutes);

Console.WriteLine(" {0,-35} {1,20}", "Total Number of Minutes:", interval.TotalMinutes);

Console.WriteLine(" {0,-35} {1,20:N0}", "Value of Seconds Component:", interval.Seconds);

Console.WriteLine(" {0,-35} {1,20:N0}", "Total Number of Seconds:", interval.TotalSeconds);

Console.WriteLine(" {0,-35} {1,20:N0}", "Value of Milliseconds Component:", interval.Milliseconds);

Console.WriteLine(" {0,-35} {1,20:N0}", "Total Number of Milliseconds:", interval.TotalMilliseconds);

Console.WriteLine(" {0,-35} {1,20:N0}", "Ticks:", interval.Ticks);

// This example displays the following output:

// 8/18/2010 1:30:30 PM - 1/1/2010 8:00:15 AM = 229.05:30:15

// Value of Days Component: 229

// Total Number of Days: 229.229340277778

// Value of Hours Component: 5

// Total Number of Hours: 5501.50416666667

// Value of Minutes Component: 30

// Total Number of Minutes: 330090.25

// Value of Seconds Component: 15

// Total Number of Seconds: 19,805,415

// Value of Milliseconds Component: 0

// Total Number of Milliseconds: 19,805,415,000

// Ticks: 198,054,150,000,000