YAGP is a plugin to enable some tweaks that might make your life easier in GLPI.

Currently, you can find these features:

• Change ticket solved date to last task end time: It will alter your ticket solved time to match exactly when your last ticket task ended. No more SLA problems, because a technician forgot to add a solution.
• Auto-renew tacit contracts: When a contract is set as tacit, its Initial contract period will auto increment with renewal date.

Download, install and test!