Difference between two dates

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I have generate the license. there is two dates for check the license is valid or not.if i have 5 days remaining to expire the license that time i change the system date ago 5 days then the license expired after 10 days. But i want 5 days remining output. not a 10 days remining.

Posted 1-May-11 19:31pm

vrushali katkade

Updated 1-May-11 20:23pm

v3

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Sergey Alexandrovich Kryukov 2-May-11 1:35am

Next time please spell-check and format the question by yourself. Also, use correct capitalization. Not doing so is simply impolite.
--SA

Sergey Alexandrovich Kryukov 2-May-11 1:36am

Not a question.
--SA

Rajesh Anuhya 2-May-11 1:37am

Not Clear

Ankit Rajput 2-May-11 1:37am

Then what is the problem

vrushali katkade 2-May-11 2:46am

but how can i check the system date is changed & if i got the last run date then how can i calculate the dates remining to expire license.

fcronin 19-May-11 18:38pm

When does the license expire? 5 days after the first use? x Days after installation? You need more detail and clarity in what you are trying to do exactly.

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-05-01T19:39:00

Solution 1

With the type System.DateTime, you can apply operators ">", "<", ">=", "<=" to see which time is sooner and subtraction operator ("-") which returns System.TimeSpan. It should help you to solve the problem.

—SA

Posted 1-May-11 19:39pm

Sergey Alexandrovich Kryukov

Ankit Rajput · Answer 2 · 2011-05-01T20:29:00

Solution 2

Hi,

You need to store Last Run Date to Registry or any where else from where you can easily read and write the data.
Now if somebody change the date then you can check the date range.

Case 1:
If somebody changes the date to back.
Now you have last run date now it get newer than Current date.
in this case, you can expire the license or anything you want to do.

Case 2: If somebody forward the date then automatically the same thing will happen.

Regards
AR

Posted 1-May-11 20:29pm

Ankit Rajput

Comments

snorkie 19-May-11 20:37pm

You need to use caution with this approach to account for a change in time zones. If a user travels several time zones away, you could incorrectly invalidate a license with this method. I like your approach, but maybe consider a 30 hour window before disabling the license.

Along these lines, it is possible to keep track of how long the program has been in use and compare that with dates to ensure that the time does not roll back too far.

raviprajapat · Answer 3 · 2011-05-19T11:35:00

Solution 3

use this for get difference between time

PreDate dateTime = "12/12/2011";
DateTime Todayday = (System.DateTime.Now).ToShortDateString();

Check Time equal

Todayday = PreDate

get Difference

Todayday > PreDate ;

Posted 19-May-11 11:35am

raviprajapat