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[英]1st I converted date to week number ( 01 to 53 ) in PHP and now i don't know how to get week number to first_date of week
[英]how do i get the 1st day of week from current date
我想得到一周的第一天?
即。
if 2011-01-01 then 2011-01-01
if 2011-01-06 then 2011-01-01
if 2011-01-20 then 2011-01-14
if 2011-01-21 then 2011-01-21
很抱歉造成误导和混淆。
我只想获取一周中第一天的日期,即。 1或7或14或21或28
如果您将星期一视为一周的第一天
echo date('Y-m-d',strtotime("last monday", strtotime('tomorrow',strtotime($date))));
您可以将monday
替换为星期几。
到目前为止,最直接的方法是从日期中减去以天为单位的星期几数(0 = 'w'
星期日,1 = 'N'
星期一):
$date = strtotime('2011-02-09');
$sunday = strtotime('-' . date('w', $date) . ' days', $date);
$monday = strtotime('-' . (date('N', $date) - 1) . ' days', $date);
$wk_day=date('w');
switch ($wk_day)
{
case 0: $diff = -1; break;
case 1: $diff = 0; break;
default :$diff = $wk_day-1; break;
}
echo date('Y-m-d', time()-(86400*$diff));
$current_date =date('Y-m-d');
$year = date('Y');
$month = date('m');
$day = date('d');
$first_day = get_week_start($year, $month, $day);
$weeks_first_day =date('Y-m-d',$first_day);
function get_week_start($year, $month, $day)
{
$timestamp = mktime(0, 0, 0, $month, $day, $year);
return $timestamp = mktime(0, 0, 0, $month, date('d', $timestamp)-date('w', $timestamp), $year);
}
您可以从$ weeks_first_day的第一天起获得几周的时间,也可以更改格式!
这里星期日是开始日期
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