php check weekday of date

$dayofweek = date('w', strtotime($date));
$result    = date('Y-m-d', strtotime(($day - $dayofweek).' day', strtotime($date)));

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3.63

8

Awgiedawgie 440220 points

                                    
Things to be aware of when using week numbers with years.

&lt;?php
echo date(&quot;YW&quot;, strtotime(&quot;2011-01-07&quot;)); // gives 201101
echo date(&quot;YW&quot;, strtotime(&quot;2011-12-31&quot;)); // gives 201152
echo date(&quot;YW&quot;, strtotime(&quot;2011-01-01&quot;)); // gives 201152 too
?&gt;

BUT

&lt;?php
echo date(&quot;oW&quot;, strtotime(&quot;2011-01-07&quot;)); // gives 201101
echo date(&quot;oW&quot;, strtotime(&quot;2011-12-31&quot;)); // gives 201152
echo date(&quot;oW&quot;, strtotime(&quot;2011-01-01&quot;)); // gives 201052 (Year is different than previous example)
?&gt;

Reason:
Y is year from the date
o is ISO-8601 year number
W is ISO-8601 week number of year

Conclusion:
if using 'W' for the week number use 'o' for the year.

Thank you! 8

3.63 (8 Votes)

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