turn-ontime
nounUK /ˌtɜːn ɒn ˈtaɪm/
US /ˌtɝːn ɑːn ˈtaɪm/
The time when something starts or begins.
The turn-ontime for the school play is at seven o'clock.
OTHER MEANINGS
2. The moment a machine or device switches on by itself.
The turn-ontime of the heater is set for six in the morning.
3. The point when a light or power comes back after an outage.
We waited for the turn-ontime of the lights after the storm.
4. The exact moment a show or broadcast begins.
Please be seated before the turn-ontime of the concert.