How can PHP be used to calculate the start date of a given week based on the week number provided?

To calculate the start date of a given week based on the week number provided in PHP, you can use the `strtotime` function along with the `date` function. First, you need to calculate the timestamp of the first day of the year and then add the number of weeks multiplied by 7 days to it. Finally, format the resulting timestamp into a date format. 

function getStartDateOfWeek($week, $year) {
    $firstDayOfYear = strtotime($year . '-01-01');
    $startDate = strtotime('+' . ($week - 1) . ' weeks', $firstDayOfYear);
    $startDate = date('Y-m-d', $startDate);
    return $startDate;
}

$weekNumber = 10;
$year = 2022;
$startDate = getStartDateOfWeek($weekNumber, $year);
echo "The start date of week $weekNumber in $year is: $startDate";

Keywords

PHP date strtotime week number start date

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