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.
Alternative manga cover
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.