PHP常用日期加减计算方法实例小结

date("Y-m-d H:i:s");

<?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";
?>

<?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";
?>

<?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";
?>