PHP关于日期加减计算的代码分享

    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";

?>

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

    // 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";

?>

    // 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";

?>

2017-11-06 19:13:02

2016-09-13

1473609600

2016-09-12

2019-11-13

2016-09-13

1473609600

2066-09-12 -> 2016-09-12 相差: 18262 天