Commercial Fixed Wing
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 11
Workload; Situational Awareness; Distraction; Confusion
ATC Issue All Types; Airspace Violation All Types; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Procedure; Human Factors; Environment - Non Weather Related
I was working the entire area combined.  The evening west departure push was going on along with other aircraft throughout the airspace.  I was pretty busy on a small scale and multiple frequencies.I descended Aircraft X to 16;000 and verified he had the weather at ZZZ [airport] and what approach he wanted.  I cleared him for the LOC/DME [Runway] XX at ZZZ [airport].  I started to hand the aircraft off to ZZZ [Approach] and took it back thinking ZZZ [Approach] had gone home for the evening and we had the airspace.  Another Controller had sat down to help but didn't yet get a briefing.  ZZZ [Approach] called to give up the airspace and I just went 'Crap.'Apparently Aircraft X had gone over to Approach on his own and the controller had been watching him.I made a mistake thinking it was later than it was and that ZZZ Approach had gone home for the night.Since the COVID started everything has been off.  We are combine sectors too much and too early.  The scale and number of frequencies we are required to work is not helpful.  We get a lot of EA [Excused Absence] and are just not as proficient as we use to be.  I would like to see sectors de combined more often or not combined as early.  There are a few that push to combine and we just accept it and work through it.  It is really not safe or comfortable to work.   Mistakes are being made.
Center Controller reported thinking it was later than it was and did not transfer communication to underlying TRACON; assuming the Center already had their airspace.