function weeks_in_year($year)
{
// This is true for ISO, not US
if (day_of_week_start() == 1) {
return date("W", mktime(0, 0, 0, 12, 28, $year));
}
// else
return ceil((day_of_week(1, 1, $year) + days_in_year($year)) / 7.0);
}
function days_between($ts1, $ts2)
{
// First date always comes first
if ($ts1 > $ts2) {
return -days_between($ts2, $ts1);
}
// If we're in different years, keep adding years until we're in
// the same year
if (date('Y', $ts2) > date('Y', $ts1)) {
return days_in_year($ts1) + days_between(add_years($ts1, 1), $ts2);
}
// The years are equal, subtract day of the year of each
return date('z', $ts2) - date('z', $ts1);
}