[RESOLVED] What day in the month is the first day of a week (based on date in querystring)

[trandom]

Hi,

I really need to work out what day of the month the first day of the week is based on a date I pass through a query string.

At the moment I am able to work out what the first date of this week is using:

$day_in_month = date('d', strtotime('last monday'));

However, the documentation for strtotime is a bit weak and i'm not really understanding it.

If I pass something like : 2006-12-24 00:00:00 through the query string, how can I find out what day in the month the first day of the week is (which should be December 18th)?.

Many Thanks,

[Installer]

$date_time = '2006-12-24 00:00:00';
$day_in_month = date('d', strtotime($date_time . ' last monday'));

Edit: That will give you the previous Monday when the input date is a Monday itself. This should get around that:

$date_time = '2006-12-24 00:00:00'; 
$unix_ts = strtotime($date_time); 
$offset = date('w', $unix_ts) - 1;
if ($offset == -1) {
    $offset = 6;
}
$day_in_month = date('j', strtotime('-' . $offset . ' days', $unix_ts));

[trandom]

Cheers