PHP 日期加减计算方法示例

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<?php    date_default_timezone_set('PRC'); //默认时区    echo "今天:",date("Y-m-d",time()),"\n";    echo "今天:",date("Y-m-d",strtotime("18 june 2008")),"\n";    echo "昨天:",date("Y-m-d",strtotime("-1 day")),"\n";    echo "明天:",date("Y-m-d",strtotime("+1 day")),"\n";    echo "一周后:",date("Y-m-d",strtotime("+1 week")),"\n";    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")), "\n";    echo "下个星期四:",date("Y-m-d",strtotime("next Thursday")),"\n";    echo "上个周一:".date("Y-m-d",strtotime("last Monday"))."\n";    echo "一个月前:".date("Y-m-d",strtotime("last month"))."\n";    echo "一个月后:".date("Y-m-d",strtotime("+1 month"))."\n";    echo "十年后:".date("Y-m-d",strtotime("+10 year"))."\n";?>

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今天:2017-11-06今天:2008-06-18昨天:2017-11-05明天:2017-11-07一周后:2017-11-13一周零两天四小时两秒后:2017-11-15 22:22:42下个星期四:2017-11-09上个周一:2017-10-30一个月前:2017-10-06一个月后:2017-12-06十年后:2027-11-06

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<?php    // 默认时区    date_default_timezone_set('PRC');          echo "今天: ", date('Y-m-d H:i:s'), "\n";       // 输出当前时间    echo "明天: ", date('Y-m-d H:i:s', strtotime('+1 day')), "\n";        // 输出明天时间         //strtotime 可以接受第二个参数，类型timestamp为指定日期    echo date('Y-m-d H:i:s', strtotime ("+1 day", strtotime('2017-11-11'))), "\n";              // 这里+1 day 可以修改参数1为任何想需要的数      // day也可以改成year（年）month（月）hour（小时）minute（分）second（秒）    echo date('Y-m-d H:i:s', strtotime("+1 day +1 hour +1 minute")), "\n";?>

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<?php    // 默认时区    date_default_timezone_set('PRC');      echo date("Y-m-d H:i:s"), "\n";     // 日期天数相加函数    echo date('Y-m-d', strtotime('+1 day', strtotime('2016-09-12'))), "\n\n";     echo strtotime('2016-09-12'), "\n";    echo date("Y-m-d", '1473609600'), "\n";    echo date("Y-m-d", '1573609600'), "\n";     // 日期天数相加函数    $d = "2016-09-12 10:12:20";    echo date("Y-m-d", strtotime("$d   +1   day")), "\n\n";        // 把日期转换成时间截    function date2time($d){        $year=((int)substr("$d",0,4));  //取得年份        $month=((int)substr("$d",5,2)); //取得月份        $day=((int)substr("$d",8,2));   //取得几号        return mktime(0,0,0,$month,$day,$year);    }    echo date2time("2016-09-12"), "\n\n";     $date_1="2066-09-12";    $date_2="2016-09-12";    $Date_List_a1=explode("-",$date_1);    $Date_List_a2=explode("-",$date_2);    $d1=mktime(0,0,0,$Date_List_a1[1],$Date_List_a1[2],$Date_List_a1[0]);    $d2=mktime(0,0,0,$Date_List_a2[1],$Date_List_a2[2],$Date_List_a2[0]);    $Days=round(($d1-$d2)/3600/24);    echo "$date_2 -> $date_1 相差: $Days 天", "\n";?>

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2017-11-06 19:13:022016-09-13 14736096002016-09-122019-11-132016-09-13 1473609600 2066-09-12 -> 2016-09-12 相差: 18262 天