CODEWITHSUNDEEP
c#
Jeremy
Jeremy

Reputation: 447

How to add an hour to a timespan. C#

I have my TimeSpan for a specific reason so it HAS to be in that format. I'm trying to add an hour on to the current time. Here is what I got, which does not work:

TimeSpan time1= TimeSpan.FromHours(1); // my attempt to add 2 hours
TimeSpan ts = DateTime.Now.TimeOfDay;
ts.Add(time1);
MessageBox.Show(ts.ToString()); // for showing me its result

Can you please advise?

Upvotes: 36

Views: 87704

Answers (9)

hosam hemaily
hosam hemaily

Reputation: 458

if you need to add minutes to time and if time is variable and not constant

TimeSpan firstTime = TimeSpan.Parse(firstTime);
TimeSpan NeededTimeForAdd= TimeSpan.FromMinutes(SessionMinutes);    
TimeSpan ExpectedTime = firstTime.Add(NeededTime);

Upvotes: 0

Junpei Kun
Junpei Kun

Reputation: 693

ts += TimeSpan.FromHours(1);

and there you have it!

Upvotes: 40

Sudhanshu Mishra
Sudhanshu Mishra

Reputation: 6733

My 2 cents: The question title says - How to add an hour to a timespan. C#, only one answer is accurate to that effect. Here's my take on adding hours to a time span:

public static TimeSpan AddHours(TimeSpan timeSpan, int hoursToAdd)
{
   TimeSpan newSpan = new TimeSpan(0, hoursToAdd, 0, 0);
   return timeSpan.Add(newSpan);
}

Here's a fiddle to Demo: https://dotnetfiddle.net/iuh66s

Upvotes: 4

margabit
margabit

Reputation: 2954

The method Add of TimeSpan is not modifying the value of ts. It is summing the values and returning a new object.

So instead you should do:

 TimeSpan ts = DateTime.Now.TimeOfDay;
 var ts2 = ts.Add(time1);
 MessageBox.Show(ts2.ToString());

Upvotes: 28

dav_i
dav_i

Reputation: 28157

var newTime = oldTime.Add(new TimeSpan(1, 0, 0));

Don't fall into the common mistake of not assigning the value to anything (i.e. newTime) as oldTime will remain the same - TimeSpan.Add(...) returns TimeSpan.

Same applies for String.Replace(...) - easy, but devastating, to miss.

Upvotes: 1

Christian Phillips
Christian Phillips

Reputation: 18769

Use AddHours();

DateTime.Now.AddHours(1);

or, to use your code (see the newTs variable)..

TimeSpan time1 = TimeSpan.FromHours(1); // my attempt to add 2 hours
TimeSpan ts = DateTime.Now.TimeOfDay;
var newTs = ts.Add(time1);
MessageBox.Show(newTs.ToString());

Also, your comment says 'my attempt to add 2 hours', is this a typo?

Upvotes: 6

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 727077

The reason why your code does not work is that TimeSpan is immutable. The TimeSpan.Add method returns a new object:

ts = ts.Add(time1);

Upvotes: 20

Rahul Tripathi
Rahul Tripathi

Reputation: 172628

Try using this:-

TimeSpan time1 = TimeSpan.FromHours(1); // my attempt to add 2 hours
TimeSpan ts = DateTime.Now.TimeOfDay;
var newts = ts.Add(time1);
MessageBox.Show(newts.ToString());

Try this:-

var newDateTime = DateTime.Now.AddHours(1);

Upvotes: 2

Daniel A. White
Daniel A. White

Reputation: 191058

var newDateTime = DateTime.Now.AddHours(1);

No need to create a TimeSpan. This will roll over to tomorrow.

Upvotes: 3

Related Questions