<?php

date_default_timezone_set('Europe/Tallinn');


$year = 2011;
for ($month = 1; $month <= 12; ++$month) {
    list($basePayday, $bonusPayday) = getPaydays($year, $month);
    print($basePayday->format('l, d.m.Y') . "\t\t" .
          $bonusPayday->format('l, d.m.Y') . "\n");
}


function isWeekend($date) {
    $weekday = $date->format('l');
    return ($weekday == 'Sunday' || $weekday == 'Saturday');
}


function getPaydays($year, $month) {
    $date = new DateTime();

    // Compute the bonus payday.
    $date->setDate($year, $month, 15);
    if (isWeekend($date)) {
        $date->modify('next Wednesday');
    }
    $bonusPayday = clone $date;

    // Compute base salary payday.
    $date->modify('last day of this month');
    if (isWeekend($date)) {
        $date->modify('previous Friday');
    }
    $basePayday = $date;

    return array($basePayday, $bonusPayday);
}