Bedtime!?

Should kids have a bedtime on weekends? If so what time? My kids are 15 yrs old and 7 years old and Monday threw Thursday nights they have a bedtime at 9pm and 10pm but in weekend my husband thinks they should Be able to stay up as long as they want since we are up sometimes til midnight but I would rather they lay down around 10:30 sometimes 11pm the latest and I tell him that and he gets all pissed off and bitches about it.