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$now = '2021-03-30';
echo 'now:'.$now.'<br><br>';
$firstDayOfThisMonth = date("Y-m-01", strtotime($now));
echo 'first day of this month:'.$firstDayOfThisMonth.'<br><br>';
$lastDayOfPrevMonth = date('Y-m-d', strtotime($firstDayOfThisMonth .'-1 day'));
echo 'last day of prev month:'.$lastDayOfPrevMonth.'<br><br>';
$firstDayOfPrevMonth = date('Y-m-d', strtotime($firstDayOfThisMonth .'-1 month'));
echo 'first day of prev month:'.$firstDayOfPrevMonth.'<br><br>';
echo '------------------------------------<br><br>';
$now = '2021-10-01';
echo 'now:'.$now.'<br><br>';
$firstDayOfThisMonth = date("Y-m-01", strtotime($now));
echo 'first day of this month:'.$firstDayOfThisMonth.'<br><br>';
$lastDayOfPrevMonth = date('Y-m-d', strtotime($firstDayOfThisMonth .'-1 day'));
echo 'last day of prev month:'.$lastDayOfPrevMonth.'<br><br>';
$firstDayOfPrevMonth = date('Y-m-d', strtotime($firstDayOfThisMonth .'-1 month'));
echo 'first day of prev month:'.$firstDayOfPrevMonth.'<br><br>';
echo '------------------------------------<br><br>';
$now = date("Y-m-d");
echo 'now:'.$now.'<br><br>';
$firstDayOfThisMonth = date("Y-m-01", strtotime($now));
echo 'first day of this month:'.$firstDayOfThisMonth.'<br><br>';
$lastDayOfPrevMonth = date('Y-m-d', strtotime($firstDayOfThisMonth .'-1 day'));
echo 'last day of prev month:'.$lastDayOfPrevMonth.'<br><br>';
$firstDayOfPrevMonth = date('Y-m-d', strtotime($firstDayOfThisMonth .'-1 month'));
echo 'first day of prev month:'.$firstDayOfPrevMonth.'<br><br>';
echo '------------------------------------<br><br>';
**
测试后果
**
now:2021-03-30
first day of this month:2021-03-01
last day of prev month:2021-02-28
first day of prev month:2021-02-01
now:2021-10-01
first day of this month:2021-10-01
last day of prev month:2021-09-30
first day of prev month:2021-09-01
now:2021-12-23
first day of this month:2021-12-01
last day of prev month:2021-11-30
first day of prev month:2021-11-01
正文完