This is a Simple Tutorial you can do on your own to get the 1st, 2nd, 3rd and 4th Sunday of the month using php date and strtotime function...Basically the Week Starting and Week Ending code of for using on time sheets. It will calculate every Sunday from the current Date entered.
NOTE: when i say "Date variable" i this video, didn't mean to confuse you. The "First Sunday - Week Ending" code blocks are not yet in a date variable in the video but will be putting the date function into a variable to insert into the database. What I meant to say was something like "date array". I am not an expert on coding yet.