Narrative:

Since covid-19 ZZZ has no tower services from xa:00 hr to xj:00 hr local time. I had taxied out for departures several times before xj:00 with no need to ask for ground services because they were closed. I was delayed and in tight quarters to taxi out of FBO; then taxi out at xj:15 and I forgot the time had lapsed and taxied out without taxi clearance.there is no excuse; just a timing issue on my part. There was no issues with other aircraft and everything went fine then I recognized what I had done and contacted the tower for departure and all was a non event. I'll be sure of the time before I taxi in the future.

Google
 

Original NASA ASRS Text

Title: Pilot taxied without clearance because he thought Tower was still closed; but it was actually 15 minutes after the Tower had opened.

Narrative: Since COVID-19 ZZZ has no Tower services from XA:00 hr to XJ:00 hr local time. I had taxied out for departures several times before XJ:00 with no need to ask for ground services because they were closed. I was delayed and in tight quarters to taxi out of FBO; then taxi out at XJ:15 and I forgot the time had lapsed and taxied out without taxi clearance.There is no excuse; just a timing issue on my part. There was no issues with other aircraft and everything went fine then I recognized what I had done and contacted the Tower for departure and all was a non event. I'll be sure of the time before I taxi in the future.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.