Need WHERE clause to filter last day in month; and second Friday in month

[pstein]

Assume I have a table "mytable" with (among others) a DATE column labelled "mydate".

Now I am searching for WHERE clauses for the following filters:

1.) How do I find all rows where the date value represents the last day in month?

2.) How do I find all rows where the date value is the second friday in month?

3.) How do I find all rows where the date value is the 10th of a month?

Thank you
Peter