I was always curious...What does it mean? What is (2/5) mean on the calendar?It was (1/5) yesterday...

I can not find a calculator tool on my phone after update where can u find it? Or do I need yo download from Google play? 

I think my brand new S22 have a problem with the media player, coz it has a broken sounds.[Please watch the video i attached) This is my first time using Android phone, so I want to know if its normal.