Backport to Drupal 6

For those interested, here is a port for drupal 6. I've never done this before so I don't even know the best to share it, so I'll just paste the code :)

It also has the patch applied for comment support.

<?php
function timeago_menu() {
  $items = array();
  $items['admin/settings/timeago'] = array(
    'title' => 'Time ago settings',
    'description' => 'Displays a date in a x time ago kind of way.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('timeago_admin'),
    'access arguments' => array('access administration pages'),
    'type' => MENU_NORMAL_ITEM,
  );

  return $items;
}

/**
 * Works out the time since the date provided.
 * @param the date in unix time format
 * @return the time since today
 */
function timeago_prepare($original, $startdate, $later = FALSE, $round = 3, $maxseconds = 32556926, $dateformat = 'medium') {
  // array of time period chunks
  $chunks = array(
  array(60 * 60 * 24 * 365 , t("year"), t("years")),
  array(60 * 60 * 24 * 30 , t("month"), t("months")),
  array(60 * 60 * 24 * 7, t("week"), t("weeks")),
  array(60 * 60 * 24 , t("day"), t("days")),
  array(60 * 60 , t("hour"), t("hours")),
  array(60 , t("minute"), t("minutes")),
  array(1 , t("second"), t("seconds"))
  );

  if ($later) {
    $since = $original - $startdate;
  }
  else {
  $since = $startdate - $original;
  }
  $print = '';

  if ($since < $maxseconds) {
  // Loop trough all the chunks
  $times     = 1;
  $totaltime = 0;
  for ($i = 0, $j = count($chunks); $i < $j; $i++) {

  $seconds    = $chunks[$i][0];
  $name       = $chunks[$i][1];
  $pluralname = $chunks[$i][2];

  if (($count = floor(($since - $totaltime) / $seconds)) != 0 && $times <= $round) {
  if ($times == 1) {
  $print .= ($count == 1) ? '1 '. $name : "$count {$pluralname}";
  }
  else {
  $print .= ($count == 1) ? ', 1 '. $name : ", $count {$pluralname}";
  }
  $times++;
  $totaltime += $count * $seconds;
  }
  }
  if ($later) {
  return t('%a later', array('%a' => $print));
  }
  else {
  return t('%a ago', array('%a' => $print));
  }
  }
  else {
  return t('on %a', array('%a' => format_date($original, $dateformat)));
  }
} // function timeago_prepare

function timeago_theme() {
  return array(
    'timeago_posted' => array(
      'arguments' => array('postdate' => NULL, 'timeago' => NULL),
    ),
  );
}

function theme_timeago_posted($postdate, $timeago) {
  $theme_content = '';
  $theme_content .= t('Posted !a', array('!a' => '<span class="timeago" title="'. $postdate .'">'. $timeago .'</span>'));
  return $theme_content;
} // function theme_timeago_posted

/**
 * hook_nodeapi implementation
 *
 * @ingroup event_nodeapi
 */
function timeago_nodeapi(&$node, $op, $teaser = NULL, $page = NULL) {
  switch ($op) {
  case 'load':
  return array(
  'timeago' => theme('timeago_posted', format_date($node->created, variable_get('timeago_node_dateformat_title', 'large')), timeago_prepare($node->created, time(), FALSE, variable_get('timeago_node_round', 3), variable_get('timeago_node_maxdate', '32556926'), 'medium'))
  );
  break;
  }
} // function timeago_nodeapi

/**
 * hook_comment implementation
 *
 * Sets $comment->timeago available in comment.tpl.php
 */
function timeago_comment(&$comment, $op) {
    switch ($op) {
    case 'view':
    $timeago = theme('timeago_posted', format_date($comment->timestamp, variable_get('timeago_node_dateformat_title', 'large')), timeago_prepare($comment->timestamp, time(), FALSE, variable_get('timeago_node_round', 3), variable_get('timeago_node_maxdate', '32556926'), 'medium'));
    $comment->timeago = $timeago;
    break;
    }
} // function timeago_comment

/**
 * Module configuration settings
 * @return settings HTML or deny access
 */
function timeago_admin() {
  // only administrators can access this module

  $form['timeago_node'] = array(
    '#type' => 'fieldset',
    '#title' => t('Time ago node settings'),
    '#description' => t('Enter date format, max time and number of parts to display for a node.'),
  );
  $form['timeago_node']["timeago_node_dateformat_title"] = array(
    '#type' => 'radios',
    '#title' => t('Date format of title'),
    '#description' => t('The date you will see when you hover over the date.'),
    '#default_value' => variable_get('timeago_node_dateformat_title', 'large'),
    '#options' => array('small' => 'Small', 'medium' => 'Medium', 'large' => 'Large')
  );
  $form['timeago_node']["timeago_node_dateformat_view"] = array(
    '#type' => 'radios',
    '#title' => t('Date format when showing the normal date'),
    '#description' => t('This setting kicks in when the number of seconds that you set below are exceeded.'),
    '#default_value' => variable_get('timeago_node_dateformat_view', 'medium'),
    '#options' => array('small' => 'Small', 'medium' => 'Medium', 'large' => 'Large')
  );
  $form['timeago_node']["timeago_node_maxdate"] = array(
    '#type' => 'textfield',
    '#title' => t('Number of seconds before it shows a normal date'),
    '#default_value' => variable_get('timeago_node_maxdate', '32556926')
  );
  $form['timeago_node']["timeago_node_round"] = array(
    '#type' => 'radios',
    '#title' => t('Number of parts to show'),
    '#default_value' => variable_get('timeago_node_round', 3),
    '#options' => array(1 => '1', 2 => '2', 3 => '3', 4 => '4', 5 => '5', 6 => '6', 7 => '7')
  );

  return system_settings_form($form);

} // function timeago_settings
?>

I don't know if I did everything right, but coder doesn't complain and it all seems to work. Have a look if you want.

Regards,

Marius