Automation: porch light on at sunset, off at 23:00. Built in Settings > Automations > Create Automation — trigger Sun: Sunset, action Light: Turn on.
Off-trigger: Time: 23:00, same automation, second action. One automation with two triggers is simpler than two automations fighting over the same light.
Test before trusting it overnight: Developer Tools > Actions, fire the sunset trigger manually once and check the light actually responds.