I screwed up. Two weeks ago I accepted a job offer, but forgot to negotiate for 2 weeks (10 days) off at the start of September. Now I'll start at my new job at the very beginning of august, and need to ask for those two weeks off. I can't reschedule the dates.
What should I do?
Do I bring it up to HR now, and ask them about getting the time off? Wait until I officially start and talk to my new supervisor?