Примеры использования общих функций, связанных со временем PHP

php
/**
 *Set time zone
 */
date_default_timezone_set("Asia/Shanghai");
 
/**
 *Get time zone
 */
echo date_default_timezone_get();
//Results UTC
echo "
";
 
/**
 *Add time
 */
$date=date_ Create ("2013-03-15"); // create a datetime object
date_add($date,date_interval_create_from_date_string("40 month"));//years days
//date_ interval_ create_ from_ date_ String creates a dateinterval from the relevant part of the string.
echo date_format($date,"Y-m-d");
//Results 2016-07-15
echo "
";
 
/**
 *Subtract time
 */
$date=date_create("2013-03-15");
date_sub($date,date_interval_create_from_date_string("40 days"));
echo date_format($date,"Y-m-d");
//2013-02-03
echo "
";
 
/**
 *Gets the difference between two time zones
 */
$date1=date_create("2013-03-15");
$date2=date_create("2013-12-12");
$diff=date_ Diff ($date1, $date2); // returns a dateinterval object
echo "
";
var_dump($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 "
";
 
/**
 *Gets the current timestamp
 */
$date=date_create();
echo date_timestamp_get($date) .'
';
 
$time = time();
echo $time .'
';
 
echo strtotime("now") .'
';
 
/*
 *Get today's 0:00 time stamp
 */
 
echo strtotime("today").'
';
/**
 *Get time with microseconds
 */
echo microtime(true);
 
/*
 *Gets the specified timestamp 
 * mktime(hour,minute,second,month,day,year);
 */
echo "
";
echo mktime(18,30,15,3,15,2019);
 
/*
 *Get the 0:00 time stamp of the previous day
 */
echo "
";
echo strtotime('yesterday');
 
/*
 *Gets the timestamp for this time of yesterday
 */
echo "
";
 
echo strtotime('-1 days');
 
?>