About Expire of a software..

I think that the problem here is to get the current date. For that you should read this[^] by SeaWater to get the date from a remote server.

If you can not get this date, you should not load the application.

Then, depending on you own logic compare this date to an "expiration" date you established.

As an alternative, you could enable the user to open the aplication for a limited number of times...

Best regards

There are several way by which you can achieve this..some are as follows..

1. Third party software to do so like SoftActive.

2. Check Data which is store by user in software with field Date, which cannot be delete by him. e.g. As you didn't mention you application type or category or 'for what purpose your application will be used.' Take example of Accounting software user always create Invoices, so he saves invoice no, date , grandtotal etc. in database. and this data will not be deleted by him because that will be required in every end of accounting year. So there you can track which date, he is using. No idea about other countries but in India, you can not create back dated invoices.

3. Save Date of installation in other format of file and keep that file some other place.
e.g. save date of installation in notpad and save that in some "windows/system32" folder.