Question

因此，为了创建日历，我想要确定任何给定月份的第一个工作日是什么。我有以下代码：

    $today=date('Y-m-d');

    IF (!$_GET) {
    $now=time();
    }
    ELSE {
    $now=strtotime($_GET['month']);
    }

    // the month in question is linked through a GET form variable in the Ymd format

    $thisdaynow=date('Y-m-d', $now);

    $monthyear=date('F Y', $now);

    $thismonth=date('M', $now);

    $thisyear=date('Y', $now);

    $weekday=date('l', $now);

    $firstday = new DateTime($thisdaynow);
    $firstday->modify('first day of this month');
    $work=$firstday->format('Ymd');
    $firstweekday=date('l', $work);
    $firstdayweek=date('w', $work);

    ECHO 'Today is '.$thisdaynow.'<br />';

    ECHO 'The first day of the month was '.$work.'<br />';

    ECHO 'Today is a '.$weekday.'.<br />';

    ECHO 'The first day of this month was a '.$firstweekday.', the '.$firstdayweek.'th day of the week.<br />';

返回：

今天是2013-05-06

本月的第一天是20130501

今天是星期一。

本月的第一天是星期六，即一周的第六天。

本月有31天。

对我所做错的任何帮助都将不胜感激!!!

Answer 1

$inputMonth = '2013-05-01';
$month = date("m" , strtotime($inputMonth));
$year = date("Y" , strtotime($inputMonth));
$getdate = getdate(mktime(null, null, null, $month, 1, $year));
echo $getdate["weekday"];

产地：星期三

如果问题仍然存在。问题可能在这里：

IF (!$_GET) {

应该是

if (!isset($_GET['month'])) {

这样，您总是会分配到当前time()，这就是为什么月份的第一天始终是当月。

http://phpfiddle.org/main/code/4ja-928

Answer 2

此代码：

$m = 1;
$d = 1;
$y = 2013;

do {
    $time = strtotime($y.'-'.$m.'-'.$d);
    $month = date('F',$time);
    $dayOfMonth = date('l',$time);
    $totalDays = date('t',$time);
    echo 'First day of '.$month.', '.$y.' is '.$dayOfMonth.' 
          ('.$totalDays.' days in '.$month.').<br />';
} while (++$m < 13);

将显示以下结果：

First day of January, 2013 is Tuesday (31 days in January).
First day of February, 2013 is Friday (28 days in February).
First day of March, 2013 is Friday (31 days in March).
First day of April, 2013 is Monday (30 days in April).
First day of May, 2013 is Wednesday (31 days in May).
First day of June, 2013 is Saturday (30 days in June).
First day of July, 2013 is Monday (31 days in July).
First day of August, 2013 is Thursday (31 days in August).
First day of September, 2013 is Sunday (30 days in September).
First day of October, 2013 is Tuesday (31 days in October).
First day of November, 2013 is Friday (30 days in November).
First day of December, 2013 is Sunday (31 days in December).

PHP手册中的更多信息：http://php.net/date

使用PHP以工作日格式返回给定月份的第一天

2 个答案: