Need HELP , go to date air calendar plugin

Hi, I need to make sure I choose the date I want in the air calendar plugin, I did this by putting a date picker on top. Except that when I click on a date it bugs and puts a date above it :/. Example: I select June 20 on the date picker, and the air calendar displays June 19.

Did you set the time zone? That may be the issue.

Thank you so much !!!