php 日期处理 例子

<?php      

date_default_timezone_set('PRC'); //默认时区    

echo "今天:",date("Y-m-d",time()),"<br>";      

echo "2008年六月:",date("Y-m-d",strtotime("18 june 2008")),"<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>";      

?>  

php判断一个日期距今天还有多少天

<?php  

echo (strtotime('2020-5-20′)-strtotime(date(“Y-m-d”)))/86400;  

?> 

处理时间的类

<?php
header("Content-type:text/html;Charset=utf-8");
class time{
private $year;//年
private $month;//月
private $day;//天
private $hour;//小时
private $minute;//分钟
private $second;//秒
private $microtime;//毫秒
private $weekday;//星期
private $longDate;//完整的时间格式
private $diffTime;//两个时间的差值
//返回年份 time：时间格式为时间戳 2013-3-27
function getyear($time="",$type=""){
if($time==""){
$time=time();
}
if($type==1){
return $this->year=date("y",$time); //返回两位的年份 13
}else{
return $this->year=date("Y",$time); //返回四位的年份 2013
}
}
//返回当前时间的月份 time：时间格式为时间戳 2013-3-27
function getmonth($time="",$type=""){
if($time==""){
$time=time();
}
switch($type){
case 1:$this->month=date("n",$time);//返回格式 3
break;
case 2:$this->month=date("m",$time);//返回格式 03
break;
case 3:$this->month=date("M",$time);//返回格式 Mar
break;
case 4:$this->month=date("F",$time);//返回格式 March
break;
default:$this->month=date("n",$time);
}
return $this->month;
}
//返回当前时间的天数 time：时间格式为时间戳 2013-3-4
function getday($time="",$type=""){
if($time==""){
$time=time();
}
if($type==1){
$this->day=date("d",$time);//返回格式 04
}else{
$this->day=date("j",$time);//返回格式 4
}
return $this->day;
}
//返回当前时间的小时 2010-11-10 1:19:21 20:19:21
function gethour($time="",$type=""){
if($time==""){
$time=time();
}
switch($type){
case 1:$this->hour=date("H",$time);//格式： 1 20
break;
case 2:$this->hour=date("h",$time);//格式 01 08
break;
case 3:$this->hour=date("G",$time);//格式 1 20
break;
case 4:$this->hour=date("g",$time);//格式 1 8
break;
default :$this->hour=date("H",$time);
}
return $this->hour;
}
//返回当前时间的分钟数 1:9:18
function getminute($time="",$type=""){
if($time==""){
$time=time();
}
$this->minute=date("i",$time); //格式 09
return $this->minute;
}
//返回当前时间的秒数 20:19:01
function getsecond($time="",$type=""){
if($time==""){
$time=time();
}
$this->second=date("s",$time); //格式 01
return $this->second;
}
//返回当前时间的星期数
function getweekday($time="",$type=""){
if($time==""){
$time=time();
}
if($type==1){
$this->weekday=date("D",$time);//格式 Sun
}else if($type==2){
$this->weekday=date("l",$time); //格式 Sunday
}else{
$this->weekday=date("w",$time);//格式 数字表示 0--6
}
return $this->weekday;
}
//比较两个时间的大小 格式 2013-3-4 8:4:3
function compare($time1,$time2){
$time1=strtotime($time1);
$time2=strtotime($time2);
if($time1>=$time2){ //第一个时间大于等于第二个时间 返回1 否则返回0
return 1;
}else{
return -1;
}
}
//比较两个时间的差值
function diffdate($time1="",$time2=""){
//echo $time1.'------'.$time2.'<br>';
if($time1==""){
$time1=date("Y-m-d H:i:s");
}
if($time2==""){
$time2=date("Y-m-d H:i:s");
}
$date1=strtotime($time1);
$date2=strtotime($time2);
if($date1>$date2){
$diff=$date1-$date2;
}else{
$diff=$date2-$date1;
}
if($diff>=0){
$day=floor($diff/86400);
$hour=floor(($diff%86400)/3600);
$minute=floor(($diff%3600)/60);
$second=floor(($diff%60));
$this->diffTime='相差'.$day.'天'.$hour.'小时'.$minute.'分钟'.$second.'秒';
}
return $this->diffTime;
}
//返回 X年X月X日
function buildDate($time="",$type=""){
if($type==1){
$this->longDate = $this->getyear($time) . '年' . $this->getmonth($time) . '月' . $this->getday($time) . '日';
}else{
$this->longDate = $this->getyear($time) . '年' . $this->getmonth($time) . '月' . $this->getday($time) . '日'.$this->gethour($time).':'.$this->getminute($time).':'.$this->getsecond($time);
}
return $this->longDate;
}
}
?>

获取昨天的时间

<?php
/**
 * 
 * 获取给定日期的前一天
 * @param string $date
 * @return string $yesterday
 */
public function getYesterday($date)
{
if(empty($date)) 
{
$yesterday = date("Y-m-d",strtotime("-1 day"));
}else{
$arr = explode('-', $date);
$year = $arr[0];
$month = $arr[1];
$day = $arr[2];
$unixtime = mktime(0,0,0,$month,$day,$year)-86400;
$yesterday = date('Y-m-d',$unixtime);
}

return $yesterday;
}

？>

获取指定日期所在月的第一天和最后一天

function GetTheMonth($date){
$firstday = date("Y-m-01",strtotime($date));
$lastday = date("Y-m-d",strtotime("$firstday +1 month -1 day"));
return array($firstday,$lastday);
}

PHP获得指定日期所在星期的第一天和最后一天

function getdays($day){
$lastday=date('Y-m-d',strtotime("$day Sunday"));
$firstday=date('Y-m-d',strtotime("$lastday -6 days"));
return array($firstday,$lastday);
}
print_r(getdays('2012-06-2'));