oa_date.module

<?php

/**
 * @file
 * Provides hook implementations and functionality to oa_date.
 */

/**
 * Implements hook_date_format_types().
 */
function oa_date_date_format_types() {
  return array(
    'oa_date' => t('Relative Date'),
  );
}

/**
 * Implements hook_views_api().
 */
function oa_date_views_api() {
  return array('api' => 3);
}

/**
 * Implements hook_date_formats().
 */
function oa_date_date_formats() {
  $formats = array();

  $formats[] = array(
    'type' => 'oa_date',
    'format' => 'l, F j',
    'locales' => array(),
  );

  return $formats;
}

/**
 * Helper function to render the relative date.
 */
function oa_date_format_date($timestamp) {
  static $dates;
  if (!isset($dates)) {
    $dates = array(
      'today' => strtotime("today"),
      'yesterday' => strtotime("yesterday"),
      'year' => strtotime("first day of January")
    );
  }
  if ($timestamp >= $dates['today']) {
    return t("Today") . format_date($timestamp, 'custom', ', F j');
  }
  elseif ($timestamp >= $dates['yesterday']) {
    return t("Yesterday") . format_date($timestamp, 'custom', ', F j');
  }
  elseif ($timestamp < $dates['year']) {
    // only add year to dates from previous years
    return format_date($timestamp, 'custom', 'l, F j Y');
  }
  else {
    return format_date($timestamp, 'custom', 'l, F j');
  }
}