How to subtract a datetime from another datetime?

How do I subtract two DateTime values from another DateTime value and have开发者_如何学C the result saved to a double?

In .NET, if you subtract one DateTime object from another, you will get a TimeSpan object. You can then use the Ticks property on that TimeSpan object to get the number of ticks between the two DateTime objects. However, the ticks will be represented by a Long, not a Double.

DateTime date1;
DateTime date2;
Long diffTicks = (date2 - date1).Ticks;

There are other interesting properties on the TimeSpan object like TotalMilliseconds and TotalMinutes and things like that which can help you out, and may be more what you are looking for.

DateTime startTime = DateTime.Now; 
DateTime endTime = DateTime.Now.AddSeconds( 75 );  
TimeSpan span = endTime.Subtract ( startTime ); 
Console.WriteLine( "Time Difference (seconds): " + span.Seconds ); 
Console.WriteLine( "Time Difference (minutes): " + span.Minutes ); 
Console.WriteLine( "Time Difference (hours): " + span.Hours ); 
Console.WriteLine( "Time Difference (days): " + span.Days );

I think this is what you need.

DateTime d1 = DateTime.Now;
DateTime d2 = DateTime.UtcNow;

var result = d1 - d2;

double dResult = result.Ticks;

Use DateTime.Subtract which will return TimeSpan , then use TotalSeconds property of the result which is of type double.

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

You should try in this.

DateTime prevDate = DateTime.Parse("25-Feb-2011 12:30");
double subDouble = DateTime.Now.Ticks - prevDate.Ticks;

I am not sure what is you want to store if you need a double

  double difference = date2.ToOADate() - date1.ToOADate();