Check Wifi connection time

Hey guys,

is there any way to see the time, when an active wifi connection has been established?
So something like an app showing "WiFi connection running since 3:45 pm" or "WiFi running for 2 hours, 12 minutes" (for example).

I am using a rooted Moto X 2014 running CyanogenMod 12.1 nightly and stock kernel.

Thanks in advance!