- i add 3 placeholders :
%vivaldi_season% : spring | summer | autumn | winter
%vivaldi_day% : the global day of the main_world
%vivaldi_dayOfSeason% : the day in the season

- I remove the mainWorld config :
Because the only world that is loaded H24 is the world(0), now the seasons are calculated from the mainworld : your world(0)
You can disable this world in the config file to disable seasons in it, but it is used to calculate seasons for the enble worlds.