Possible Duplicate:
Get first day of week in PHP?
Given a timestamp I need to find the first day the week the timestamp belongs to.
e.g.
$format = "first day of week";
//convert to time
$time = strtotime("2011-07-01 00:00:00");
//format the time to the first day of the week
$date = strtotime($format,$time);
//Put the first day of the week into a pretty format
$weekStartDate = date("Y-m-d",$date);
The week start should equal 2011-06-27 at the moment its gone horribly wrong and equals 1970-01-01 which suggests to me the “first day of week” format is invalid.
Any ideas would be much appreciated thanks,