how to calculate 30 days trail time for my software

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i can calculate time by using system date and time. But problem is that if the user will change system date and time that time what can i do ? or what will be the best solution ?

Posted 4-Jan-16 22:21pm

al-foysal

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3 solutions

Solution 2

You'll probably need to host a website somewhere that your software connects to when it first starts\is registered which will store the key with the registration date. Your service will provide an API that the software will pass the registration key to when it starts and the service will respond to say if the trial period has elapsed. The downside to this is obviously that the software needs an on-line connection to work, and you'll really need to use https for your api calls if you use an http-based API.

Creating Secure Trial Versions for .NET Applications - A Tutorial[^]

Posted 4-Jan-16 23:16pm

F-ES Sitecore

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al-foysal 5-Jan-16 23:31pm

thanks for kind response. yeah that is right . but i want to do that without internet i.e offline.

Solution 3

at the time of registration u create a file and compare the file created date with or store value in the file compare.

Posted 4-Jan-16 23:24pm

revankm

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al-foysal 5-Jan-16 23:36pm

thanks.so file created date need to compare with which date ?(System date or else ?) if system date , that time problem is -if user will change system date !

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revankm · Accepted Answer · 2016-01-04T22:31:00

Solution 1

use serial key method. give serial key which encoded with the date.

Posted 4-Jan-16 22:31pm

revankm

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al-foysal 5-Jan-16 4:45am

thanks for kind response .that is ok . but i need to calculate date to compare with registration time .how i calculate? is it clear.