Well, Voyager was the first Berman-era show with a consistent nationwide airdate, since it always aired on UPN. Since DS9 was always syndicated, I believe the date listed on Memory Alpha are just the earliest date it was available to air, but depending on the market, the actual airdate could be anywhere in that following week.
In my memory the syndication release date for TNG and DS9 were on Mondays -- it weirdly came up for me a lot in a practical way, since my family was all about road trips in an RV, so I was forever in random campgrounds somewhere in America and having to figure out when the local station aired Trek, and then hope I could adjust the antennae just so to get that channel to come in. And I seem to remember that most markets would air Trek on Sundays, because I remember thinking it was interesting that that was as far as you could get from the Monday release date and still be in the same week.
But I see a lot of what Memory Alpha lists are Sundays, so maybe my recollection is COMPLETELY wrong. Or maybe just half wrong, maybe my impression was most markets aired it on Saturdays, a week off from a Sunday drop?