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There is no reliable way to do this without using an external clock source, such as one on the Internet.
The only place I know of to get that the system time changed would be from the System Event Log. Still, even the event log can be cleared out without your code ever seeing the event.
Monitoring for it and watching the time contantly isn't going to do you any good. What if the system time changes when Windows isn't running??
The only way to do it would be to compare the current system time to an external reference and make a note of the offset. Every once in a while (while your code is running) you'll have to compare the current time to the external source again and see if the time is current, again, considering the offset you noted before, plus or minus a variance. PC clocks don't run at exactly the same speed and will drift over time.
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Simple to reroute using the host-file 
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
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Even if you use the IP address?
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Thank you all for your quick answers. But I should inform you that I am not so much educated in vb.net like you all. Therefore believe me your answers are just like a Tangent for me.
Ok, let me state you my idea which i would like to implement
1. My process starts with windows (continuously checking the system date and time and matching.)
2. User starts main program (checks if the process is running.)
Somehow user understood and find that the process is responsible for date time checking. So he close the process from windows task manager.
3. My process close my main program before closing.
4. User wants to start main program. (Main program checks and found process is not running)
5. Main program will not run.
I tried to create the process and tried to close Microsoft Word with that but failed......
Imports System
Imports System.Diagnostics
Public Class Form1
Dim iDate As DateTime = DateTime.Now
Dim MyProcess() As Process = System.Diagnostics.Process.GetProcessesByName("winword")
Sub New()
InitializeComponent()
Timer1.Interval = 1000
Timer1.Enabled = True
Application.Run()
End Sub
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Dim iDateNow As DateTime = DateTime.Now
If iDateNow < iDate Then
For Each p As Process In MyProcess
p.Kill()
Next
End If
End Sub
End Class
While I tried to close the process, Microsoft word was not closing.
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Biplob Singha Shee wrote: While I tried to close the process, Microsoft word was not closing.
You've not added any code to kill the process when your application exits. You'd need to do that from the Closing event of your form.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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I wrote the code to kill the process
For Each p As Process In MyProcess
p.Kill()
Next
and before that I declare the variable
Dim MyProcess() As Process = System.Diagnostics.Process.GetProcessesByName("winword")
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But in the code you posted, there is nothing which will run when the form is closed. The only time your p.Kill() code will execute is if the system time is changed to be earlier than the start time of your program.
The only time that will normally happen is when the computer transitions out of Daylight Saving Time, when the clocks go back by one hour. (Since that's not the issue you're trying to address, you should be using DateTime.UtcNow instead.)
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Sir, could you please help me on closing an application from another application.
I need some code idea.
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You just need to add the code to a handler for the Closing event of your form:
Private Sub FormClosing(ByVal sender As Object, ByVal e As FormClosingEventArgs) Handles MyBase.FormClosing
Dim MyProcess() As Process = Process.GetProcessesByName("winword")
For Each p As Process In MyProcess
p.Kill()
Next
End Sub
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Thank you very much. But I tried with this code. It is not closing Microsoft Word.
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The name of the process is "winword.exe", not "winword".
Oh! And your code is making the rather LARGE assumption that there will only be one instance of Word running, created by your application. That is simplly not going to be the case and you should NOT be blindly killing off every instance of Word you find.
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Your entire concept is flawed. You cannot reliably check to see if the time has been altered without using an external (on the Internet) time source.
And you really don't need two processes for this...
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I know my code is "FLAWED" but my concept is not wrong as because in my area everybody does not have internet connection or Internet connection is not available for everybody as everybody can not bear the cost of internet connection.
So I have to do it without internet connection (External resource of DateTime checking).
I again say my code is FLAWED and that is why I am asking a help from you people. I know you all are exparts.
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Again, there is NO WAY to check to see if the Date/Time has changed without an external time source. You can NOT do what you want without one.
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Thank you sir for your reply.
But I know one thing. THERE IS NOTHING IMPOSSIBLE IN THIS WORLD. I do not want to invent anything but I have to discover the solution of my problem.
But the problem is I DO NOT HAVE MORE KNOWLEDGE IN VB.NET.
Thank you again for your quick and kind reply.
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Biplob Singha Shee wrote: THERE IS NOTHING IMPOSSIBLE IN THIS WORLD
One, you're one THOSE. OK Mr. Smarty Pants. Lay flat on the ground and have a 6 ton African elephant stand directly on your chest for 10 minutes. Live to tell us about how it felt.
Biplob Singha Shee wrote: I have to discover the solution of my problem.
For the last time... Without a connection to an external time source, be it on the internet or a physically and properly secured server machine on the network that your client machine is connected to THERE IS NO WAY TO DETECT IF THE SYSTEM CLOCK IS NOT CORRECT.
Have a nice life.
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Ha ha ha ha 
Do you want to give me solution or wanna kill me ?? 
Actually I do not want to argue with you or this forum is not for the ARGUMENT. I just want to eat an apple but you are preventing me for cutting the apple tree. Oh boss why should I cut the tree ??? I can get it from the tree or if I cannot, I can easily get it from the market no ???
Important thing is how and which way a person implements his/her idea or concept. It is not that he/she should stroke his/her head with a hammer to get the real way.
I again say I do not want to argue with you as you are an expert and I am just a novice and I accept that. and NOTHING IS IMPOSSIBLE in terms of implementing the code.
If you have solution then please give me. If not I am requesting you please do not try to use abusive language. Please try to respect everybody as they are not actually hurting you... as YOU ARE AN EXPERT I am accepting..... and everybody will accept also, but that does not mean the others are less.
modified 9-Jul-13 13:48pm.
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Biplob Singha Shee wrote: NOTHING IS IMPOSSIBLE in terms of implementing the code.
Really? Outside of the code itself, just how are you going to RELIABLY determine if the clock has been rolled back without an external time source?
I guarantee that every method you come acrossed, that doesn't use an external time source, can be easily defeated.
You're looking for a solution that doesn't exist!
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Somewhere somebody told this type of negetive answer before human reaches moon.
Dave Kreskowiak wrote: I guarantee that every method you come acrossed, that doesn't use an external time source, can be easily defeated.
I know it can be defeated but not
Dave Kreskowiak wrote: easily
It is not that easy for everybody to defeat others.
I am confident because I have already implemented my concept (not windows process) of clock manipulation in visual basic 6.0 (without any external resource of DateTime) and I somewhat succeeded. Yes SOMEWHAT as I know (as I have already told some time ago) my code is not full-proof but my concept is not wrong. What is the wrong in it if I want to try At least ?
Dave Kreskowiak wrote: You're looking for a solution that doesn't exist!
One thing I would like to ask you.....
DO YOU KNOW EVERY PROCEDURE/SOLUTION ???
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Biplob Singha Shee wrote: One thing I would like to ask you.....
DO YOU KNOW EVERY <br />
PROCEDURE/SOLUTION ???
To this problem?? Yes.
And, yes, EASILY defeated. The ONLY methods to combat clock tampering that have any security at all all involve using an external time source.
The whole point behind doing this is protecting your application from people who "try" but never "buy". There are various levels of people who will steal your software. The "script kiddies" being at the bottom of the list and all-out "hackers" at the top. What you propose will stop the know-nothing "script kiddies" and that's about it. Get someone who know anything about what you're doing watching the clock and your code starts to fall very easily.
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Dave Kreskowiak wrote: your code starts to fall very easily.
Do you really want to help me ? It seems you are continuously trying to make me wrong. Ok. I accept I am wrong. But what is the problem if I try with that ? I KNOW MAY BE MY METHOD IS WRONG BUT MY CONCEPT IS NOT WRONG OR I HAVE TO REVIEW MY METHOD.
You do not have even a single solution for a local system where internet is not connected and you are trying to teach me with external source.
Dave Kreskowiak wrote: And, yes, EASILY defeated.
No, sorry, not easily. Because everybody is not Dave Kreskowiak right? I am confident because I have already implemented that and I somewhat succeeded. Yes SOMEWHAT because I know my loose points but a user never never never finds that as users are not Dave Kreskowiak right?
Dave Kreskowiak wrote: The "script kiddies" being at the bottom of the list and all-out "hackers" at the top
This will happen when my program will be popular and will be found from any source. And with in that period if I live, I will solve it believe me.
and last...............
Dave Kreskowiak wrote: To this problem?? Yes.
Then you are GOD ............
...........and I don't wanna argue with him.
So please don't waste your time to answer me. I know I cannot get any help from you, at least I didn't get any for last 4 hours.
So many thanks for your kind valuable time for me. Thank you again....
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Biplob Singha Shee wrote: Then you are GOD ............
No, just very educated on the subject.
Have a nice life!
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Dave Kreskowiak wrote: Have a nice life!
Same to you Boss.
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Biplob Singha Shee wrote: I do not want to invent anything but I have to discover the solution of my problem.
There is no way to "guarantee" that you are getting "the real date". Take a step back; what if your code runs in a VM? How would you know? How would you verify that today isn't Christmasday 1999?
The worst part of copy-protection schemes is that they piss of real users; would you invalidate my copy when Europe hits summer-time?
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
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