1. First create an renpy file
2. Defined an world
   tg_world:
        name "Tierra"     
        day 12     
        month 5     
        year 1586     
        time "world_def/time_world.json"
3. write this for show date on dialog
   $ dateworld=_tagon_worlds[_tagon_actual_world]
   tg_calendar days 1 #add one day to calendar
   MC "[dateworld]"
   tg_calendar days 1
   MC "[dateworld]"

tg_calendar have this keywords:

• world -> Srtring
• days -> Integer

world keyword is optional, used only when several worlds were created, since it always chooses the last world created.