Dateinterval php

<?php
$d1=new DateTime("2012-07-08 11:14:15.638276");
$d2=new DateTime("2012-07-08 11:14:15.889342");
$diff=$d2->diff($d1);
print_r( $diff ) ;
?>

// Note: it now DOES return microsecond differences, in the key 'f':

<?php
DateInterval Object
(
    [y] => 0
    [m] => 0
    [d] => 0
    [h] => 0
    [i] => 0
    [s] => 0
    [f] => 0.251066
    [weekday] => 0
    [weekday_behavior] => 0
    [first_last_day_of] => 0
    [invert] => 1
    [days] => 0
    [special_type] => 0
    [special_amount] => 0
    [have_weekday_relative] => 0
    [have_special_relative] => 0
)
?>

<?php
  $one_year = new DateInterval('P1Y');
  $one_year_ago = new DateTime();
  $one_year_ago->sub($one_year);
?>

Please note that the hour field can be negative, especially in the context of switching to/from Daylight savings.

Example:
<?php

  $tz = new DateTimeZone("America/New_York");
  $date_1 = new DateTime("2019-10-30 15:00:00",$tz);
  $date_2 = new DateTime("2019-11-21 14:30:20",$tz);
  echo $date_2->diff($date_1)->format("%a:%h:%i:%s");
  // returns 21:-1:30:20
?>

Source: php.net

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