php_ago_ymdhis

<?php

function pluralize( $count, $text )
{
    return $count . ( ( $count == 1 ) ? ( " $text" ) : ( " ${text}s" ) );
}

function finddiff($datetime1, $datetime2)
{
    $final_result = [];
    $datetime1 = new DateTime($datetime1);
    $datetime2 = new DateTime($datetime2);
    $interval = $datetime1->diff($datetime2);
    $suffix = ( $interval->invert ? ' ago' : '' );
    if ( $v = $interval->y >= 1 ) $final_result[] = pluralize( $interval->y, 'year' ) . $suffix;
    if ( $v = $interval->m >= 1 ) $final_result[] = pluralize( $interval->m, 'month' ) . $suffix;
    if ( $v = $interval->d >= 1 ) $final_result[] = pluralize( $interval->d, 'day' ) . $suffix;
    if ( $v = $interval->h >= 1 ) $final_result[] = pluralize( $interval->h, 'hour' ) . $suffix;
    if ( $v = $interval->i >= 1 ) $final_result[] = pluralize( $interval->i, 'minute' ) . $suffix;
    if ( $v = $interval->s >= 1 ) $final_result[] = pluralize( $interval->s, 'second' ) . $suffix;
    return implode(' ', $final_result);
}

$datetime1 = '2007-08-02';
$datetime2 = '2009-10-13';
echo finddiff($datetime1,$datetime2);
?>

Ref: https://www.php.net/manual/en/datetime.diff.php#97880