Flight Crew Commercial; Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Private
Flight Crew Last 90 Days 126; Flight Crew Total 2399; Flight Crew Type 2399
Time Pressure; Communication Breakdown
ATC Issue All Types; Airspace Violation All Types; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Environment - Non Weather Related; Human Factors; Airport
Scheduled flight from ZZZ to ZZZ1. Tower was closed for operations due to COVID-19. We both followed procedures for closed Tower; by making calls in the blind and contacting ZZZ TRACON for clearance and for departure time/permission There were multiple scheduled pushbacks at XA:45. The Captain briefed pushing back a few minutes early if possible to help alleviate congestion in a non-tower environment. We pushed and taxied to the hold short and called TRACON we were ready for departure. TRACON released us. I asked TRACON to clarify we were cleared to takeoff and they replied yes we were. We took off and departed uneventful following noise abatement procedure. After airborne; we discussed that we had departed several minutes before XB:00. ZZZ 10-7 page states no departures XP:00-XB:00L. After obtaining release from TRACON and verifying we were cleared to takeoff from ZZZ we realized that we had taken off several minutes prior to XB:00 once we were airborne. Other aircraft from another airline also took off before XB:00.
[Report narrative contained no additional information.]
Air carrier flight crew reported the ATC Tower changed hours of operation and was closed due to COVID-19; resulting in a takeoff before curfew ended.