It's an app called "SBSettings" from the BigBoss repo, one of the most sought after tweaks. It allows you to toggle your toggles like Wifi, Data, Location, etc, lets you adjust your brightness, allows you to hide certain apps, allows you to reboot/respring/power off/safe mode your device just by tapping without pressing any buttons, allows you to manage your processes, shows you your data/wifi IP, etc etc. It's basically a must have tool, even listed in Cydia > Featured > Tools to Get Started.
As for what @iniesta was looking for, SBSettings does this too. You can add the date on your statusBar and such as well.