php 时间 日期

获取月初与月末

/**
 * 获取当前月初与月末时间
 * 
 * 
 */
$month =8;
$year = 2019;
$startDay = $year . '-' . $month . '-1';
$endDay = $year . '-' . $month . '-' . date('t', strtotime($startDay));
print_r($startDay);
print_r($endDay);

常用周期性时间

echo "今天:".date("Y-m-d")."<br>";       
echo "昨天:".date("Y-m-d",strtotime("-1 day")), "<br>";       
echo "明天:".date("Y-m-d",strtotime("+1 day")). "<br>";    
echo "一周后:".date("Y-m-d",strtotime("+1 week")). "<br>";       
echo "一周零两天四小时两秒后:".date("Y-m-d G:H:s",strtotime("+1 week 2 days 4 hours 2 seconds")). "<br>";       
echo "下个星期四:".date("Y-m-d",strtotime("next Thursday")). "<br>";       
echo "上个周一:".date("Y-m-d",strtotime("last Monday"))."<br>";       
echo "一个月前:".date("Y-m-d",strtotime("last month"))."<br>";       
echo "一个月后:".date("Y-m-d",strtotime("+1 month"))."<br>";       
echo "十年后:".date("Y-m-d",strtotime("+10 year"))."<br>";