So far with
strtotime('last day of this month');
gives me the last day (31), but I want the penultimate (30), and I've tried with:
strtotime('-1 day','last day of this month');
Also with strtotime('last day of this month') - strtotime('1 day'); and other things. Always results in (formatted with date()) 31-dec-1969.
How can I achieve this?