how to display a calendar and put info in it

Question

Hi guys! I'm trying to create a calendar of the current month and put information in it (like schedules) and the next time I open this app, I want that the information I've put in it shows up to me (may be offline)
I know some html, css, js and java

Answer 1

https://code.sololearn.com/WkopXPt58yiX/?ref=app