Shueisha's JUMP GIGA is not included since it publishes in irregular intervals.
Dates are the usual recurring release dates of the magazine and can vary 1-2 days depending on the publisher's final release. Usually weekends are avoided, so if the schedule is every 3rd of the month but it lands on a Sunday, it'll be released on the 1st instead.
Typically, magazines release earlier than its release date if not on the day itself but not later.
Issues are usually a month or week ahead (so an August issue will be released in July).
A gift emoji 🎁 beside the magazine name denotes that it usually has a furoku (a special official freebie) which could vary from issue to issue. It's a good and cheaper alternative for official anime / manga merchandise.
Key chain
Acrylic stand
Alternative manga cover
Clear file
Poster
Calendar
Sticker
Bag
Bromide
Postcard
Pen
Sticky note
Bookmark
Coaster
Trading card
etc.
Anime or entertainment magazines, which typically includes a furoku by default (though it's not anime/manga-related all the time), are not included.
Manga magazine subscription is still in the works.
Click here or here (opens in a new tab) for a furoku-specific schedule (non-manga magazines).
This is a compiled schedule by Tankobonbon. Adding credits when using it outside of Tankobonbon's service is not required but highly appreciated.