- date: documentation ( source)
- strtotime: documentation ( source)
- sprintf: documentation ( source)
<?php
echo "Monday, 1st week of 2016 => ";
$year = 2016;
$week = sprintf('%02d', 1);
$dof = 1;
echo date( "l, M jS, Y", strtotime($year."W".$week.$dof) );
echo "\n\n";
echo "Thursday, 7th week of 2016 => ";
$year = 2016;
$week = sprintf('%02d', 7);
$dof = 4;
echo date( "l, M jS, Y", strtotime($year."W".$week.$dof) );