How to find the first day of the week a given date belongs to?

Question

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,

Have you var_dumped your strtotime outputs to see what you get? — , Jul 01 '11 at 08:56
Thanks Pekka, its a duplicate the answer is on the other question and is to use the format "last sunday" — woot586, Jul 01 '11 at 09:00
$format = "first day of week"; should be "first day of this week", no? — sdolgy, Jul 01 '11 at 09:04

score 12 · Accepted Answer · answered Jul 01 '11 at 09:02

12

$time = strtotime("2011-07-01 00:00:00");

$weekStartDate = date('Y-m-d',strtotime("last Monday", $time));

answered Jul 01 '11 at 09:02

Ion Roata

286
3
6

score -1 · Answer 2 · answered Jul 01 '11 at 09:06

-1

Test it :

$time=[Your Request Time];

$dayofweek = date("w",strtotime($time));

if( $dayofweek != 0  )

    $firstdayOfWeek = strtotime( $time . " - " . $dayofweek . " days " );

else

    $firstdayOfWeek = strtotime($time);

answered Jul 01 '11 at 09:06

Hamid

1,700
2
13
19

How to find the first day of the week a given date belongs to?

2 Answers2