@Tony Thanks for replying. Pause on my phone's app (Tether) works. Log on //192.168.0.1 (router) and go to "Advanced" -> "System" -> "Time & Language", it has Time zone setting. Previously it was...

Following the instruction, go to "Parental Controls" -> select profile -> "Time Limits" --> select "Bedtime", set Bedtime from 9pm to 8am for both School nights and Weekend, but it does enable wifi...