What are the commonly used time-related functions in PHP?

Commonly used functions related to time in PHP are: date_default_timezone_set(), date_create(), date_diff(), date_timestamp_get(), strtotime(), microtime(). Let’s introduce them one by one through the code.

Code example:

<?php
/**
 * 设置时区
 */
date_default_timezone_set("Asia/Shanghai");
 
/**
 * 获取时区
 */
echo date_default_timezone_get();
//结果 UTC
echo "<br/>";
 
/**
 * 添加时间
 */
$date=date_create("2013-03-15"); //创建一个DateTime 对象
date_add($date,date_interval_create_from_date_string("40 month"));//years days
//date_interval_create_from_date_string 从字符串的相关部分建立一个DateInterval。
echo date_format($date,"Y-m-d");
//结果2016-07-15
echo "<br/>";
 
/**
 * 减去时间
 */
$date=date_create("2013-03-15");
date_sub($date,date_interval_create_from_date_string("40 days"));
echo date_format($date,"Y-m-d");
//2013-02-03
echo "<br/>";
 
/**
 * 获取两个时区的差值
 */
$date1=date_create("2013-03-15");
$date2=date_create("2013-12-12");
$diff=date_diff($date1,$date2);//返回的是一个DateInterval对象
echo "<pre class="brush:php;toolbar:false">";
var_dump($diff);
// object(DateInterval)#4 (15) {
//  ["y"]=>
//  int(0)
//  ["m"]=>
//  int(8)
//  ["d"]=>
//  int(27)
//  ["h"]=>
//  int(0)
//  ["i"]=>
//  int(0)
//  ["s"]=>
//  int(0)
//  ["weekday"]=>
//  int(0)
//  ["weekday_behavior"]=>
//  int(0)
//  ["first_last_day_of"]=>
//  int(0)
//  ["invert"]=>
//  int(0)
//  ["days"]=>
//  int(272)
//  ["special_type"]=>
//  int(0)
//  ["special_amount"]=>
//  int(0)
//  ["have_weekday_relative"]=>
//  int(0)
//  ["have_special_relative"]=>
//  int(0)
// }
echo "<br/>";
 
/**
 * 获取当前时间戳
 */
$date=date_create();
echo date_timestamp_get($date) .&#39;<br/>&#39;;
 
$time = time();
echo $time .&#39;<br>&#39;;
 
echo strtotime("now") .&#39;<br/>&#39;;
 
/*
 *获取今天0点时间戳
 */
 
echo strtotime("today").&#39;<br>&#39;;
/**
 * 获取带微秒的时间
 */
echo microtime(true);
 
/*
 *获取指定时间戳 
 * mktime(hour,minute,second,month,day,year);
 */
echo "<br/>";
echo mktime(18,30,15,3,15,2019);
 
/*
 *获取前一天0点时间戳
 */
echo "<br/>";
echo strtotime(&#39;yesterday&#39;);
 
/*
 *获取昨天此时的时间戳
 */
echo "<br/>";
 
echo strtotime(&#39;-1 days&#39;);
 
?>

Running result:

Asia/Shanghai
2016-07-15
2013-02-03
object(DateInterval)#4 (15) {
  ["y"]=>
  int(0)
  ["m"]=>
  int(8)
  ["d"]=>
  int(27)
  ["h"]=>
  int(0)
  ["i"]=>
  int(0)
  ["s"]=>
  int(0)
  ["weekday"]=>
  int(0)
  ["weekday_behavior"]=>
  int(0)
  ["first_last_day_of"]=>
  int(0)
  ["invert"]=>
  int(0)
  ["days"]=>
  int(272)
  ["special_type"]=>
  int(0)
  ["special_amount"]=>
  int(0)
  ["have_weekday_relative"]=>
  int(0)
  ["have_special_relative"]=>
  int(0)
}
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1591113600
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1591027200
1591064459

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