Update:
This post has been updated to reflect changes in Moodle 4.x
The Moodle installation package is built weekly with new fixes. As a Moodle site administrator it’s always handy to know your installation’s version and build to be able to identify version or build related bugs and decide if you need to upgrade to the latest version.
To check this piece of information, all you need to do is navigate to the “Notifications” option by going to Site administration > General > Notifications
as shown on the screenshots below.
The screenshots used are taken from our latest Moodle 4.x theme Edutor.