In the Z-BlogPHP application below, the functionality of "getting the first day of a timestamp's week" is used. However, the initial implementation is not correct.
Rainy Collection - Z-Blog Application Center:
Initially, the intention was to directly obtain the timestamp of 00:00:00, but it turned out to be too troublesome and prone to errors.
function mz_ShikonNoTama_GetCurMonday($time)
{
// Incorrect implementation
// $w = date("N", $time);
// return $time - ($time % 86400) - 86400 * ($w - 1) - 3600 * 8;
// Correct implementation
$week = date("N", $time);
return $time - ($week - 1) * 86400;
// If you really want to get 00:00, you can do it like this
// $week = date("N", $time);
// return $time - ($week - 1) * 86400 - (($time + 28800) % 86400);
}
$arr = [1642896000, 1642953599, 1642953600, 1642957612];
$rltHTML = '';
for ($i = 0; $i < count($arr); $i++) {
$time = $arr[$i];
$date = date("Y-m-d H:i", $time);
$week = date("N", $time);
$monday = $time - ($week - 1) * 86400;
// $monday = $time - ($week - 1) * 86400 - (($time + 28800) % 86400);
$rltHTML .= strtr($tpl, [
'{key}' => 'time',
'{value}' => $date,
]);
$rltHTML .= strtr($tpl, [
'{key}' => 'week',
'{value}' => $week,
]);
$rltHTML .= strtr($tpl, [
'{key}' => 'monday',
'{value}' => date("Y-m-d H:i", $monday),
]);
$rltHTML .= "<br>";
}
echo $rltHTML;
// N 丨 ISO-8601 format number of the day of the week 丨 1 (for Monday) to 7 (for Sunday)
// w 丨 Numeric representation of the day of the week 丨 0 (for Sunday) to 6 (for Saturday)
// D 丨 A textual representation of a day, three letters 丨 Mon to Sun
// l (lowercase 'L') 丨 A full textual representation of the day of the week 丨 Sunday to Saturday
time: 2022-01-23 08:00
week: 7
monday: 2022-01-17 08:00
time: 2022-01-23 23:59
week: 7
monday: 2022-01-17 23:59
time: 2022-01-24 00:00
week: 1
monday: 2022-01-24 00:00
time: 2022-01-24 01:06
week: 1
monday: 2022-01-24 01:06