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Interval

Synopsis for the class DateInterval:
Properties
int $y
int $m
int $d
int $h
int $i
int $s
int $invert
mixed $days
Methods
__construct(string $interval_spec)
static DateInterval createFromDateString(string $time)
ALIAS date_interval_create_from_date_string(……)
string format(string $format)
ALIAS date_interval_format(……)

For DateInterval, the following characters are recognized in $interval_spec:
P All format strings start with P
Y Years
M Months
D Days
W Weeks
T Any time portion is preceded by T
H Hours
M Minutes
S Seconds
Eg. Using DateInterval:
RESETRUNFULL
<!DOCTYPE html><html><head></head>
<body>
<?php

$dt = new DateTime();
$di = new DateInterval('P3Y3M3DT3H3M3S');

echo $dt->format("r")."<br />";
$dt->add($di);
echo $dt->format("r")."<br />";
date_sub($dt,$di);  // alias
echo $dt->format("r")."<br />";

$dt2 = new DateTime('2000-12-25');
$dd=$dt->diff($dt2);
var_dump($dd);
echo "<br />".$dd->invert."<br />"; 
// invert==1 means $dt2 occurs before $dt
echo $dd->format("%r%y years %m months %d days %h hours %i minutes %s seconds")."<br />";
echo $dd->format("%r%Y years %M months %D days %H hours %I minutes %S seconds")."<br />";
echo date_interval_format($dd,"%r%a days.")."<br />"; // alias
?></body></html>
Eg. Using DateInterval::createFromDateString:
RESETRUNFULL
<!DOCTYPE html><html><head></head>
<body>
<?php
$di=date_interval_create_from_date_string('3600 seconds');
$di=DateInterval::createFromDateString('1 day');
$di=DateInterval::createFromDateString('2 weeks');
$di=DateInterval::createFromDateString('3 months');
$di=DateInterval::createFromDateString('4 years');
$di=DateInterval::createFromDateString('1 year + 1 month');
$di=DateInterval::createFromDateString('1 day + 12 hours');
$dt = new DateTime();
$dt->add($di);
echo $dt->format('H:i:sA');
?></body></html>