How to redirect my Magento website from HTTP to HTTPS ?

To redirect a Magento website from HTTP to HTTPS, I think which Magento version you are using is not an important one.  

You just follow these following steps:

1. Your host/PHPMyAdmin
2. Select your database from the existing
3. Find for the table `core_config_data` in that
4. Now, change the secured and unsecured URLs here, like https://www.domain.com/