Checked the whole setup for “date_default_timezone_set” and removed them.
Problem still occurs in the date picker.
So. this problem has been giving me problems for a year. I had a custom post type with custom page template. I was calling – date() in my template. I realized that i had to change every instance of date() to wp_date(). For instance i had a if(date('D') == 'Sun')
i changed to if(wp_date('D') == 'Sun')