Back in ancient times, my first software job was with an crusty old fashioned company. We were required to be in before 8am, many people arrived as early as 6am. Dress code was also very strict (but more lenient than it was historically)
My second software job was with a company that was just as old but much more modern (not startup-ish). the boss required the team to be in before 9am, daily team meeting was at 9.
My job now has flextime with core hours between either 10-3 or 10-2 (can't recall which) but very few people arrive after 9am. All other jobs I've worked have flextime with similar core hours, there was only one job that had a true "no rules" approach.
My preferred hours used to be 730-330. The last place I was at the majority turned up around 930, and then milled about drinking coffee and chatting for the first hour or so.
I've always liked an early start for an early finish, I was one of the very few working early though in most places.