Tutorials, PHP & MySQL

getting the week commencing date and week number using PHP

Using php's date function you can get all sorts of date combinations including finding the week commencing date for any date.

The following function takes a date and returns the previous Monday's date.

function last_monday($date) {
    if (!is_numeric($date))
        $date = strtotime($date);
    if (date('w', $date) == 1)
        return $date;
        return strtotime('last monday',$date);

Using this function is simple, pass a call to the function inside a date to format the date as desired.

$date = date('Y-m'd');
echo date('jS M', last_monday($date));

To get the week number for the current date is also very simple:

echo date("W");

To get the week number for a custom date, use date combined with strtotime:

$date = '2013-01-10';
echo date('W', strtotime($date));


David Carr

David Carr

For the past 12 years, I’ve been developing applications for the web using mostly PHP. I do this for a living and love what I do as every day there is something new and exciting to learn.

In my spare time, the web development community is a big part of my life. Whether managing online programming groups and blogs or attending a conference, I find keeping involved helps me stay up to date. This is also my chance to give back to the community that helped me get started, a place I am proud to be apart of.

Besides programming I love spending time with friends and family and can often be found together going out catching the latest movie, staying in playing games on the sofa or planning a trip to someplace I’ve never been before.