title: Selecting all entries where something happened at specific day of the week or specific day of the month
body: <p>Hello I want to select every person from table that was born on sunday.
  The second thing i want is to select every person that was born on 13th day of the month.</p>
  <p>I tried a ton of things but i think i fundamentally do not understand how to construct a question like this</p>
  <p><a href="https://i.stack.imgur.com/RscEa.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RscEa.png" alt="enter image description here" /></a></p>
  <p>I'm using PostgreSQL</p>