class views_handler_field_date

class views_handler_field_date extends views_handler_field {
    
    /**
     * {@inheritdoc}
     */
    public function option_definition() {
        $options = parent::option_definition();
        $options['date_format'] = array(
            'default' => 'small',
        );
        $options['custom_date_format'] = array(
            'default' => '',
        );
        $options['second_date_format_custom'] = array(
            'default' => '',
        );
        $options['second_date_format'] = array(
            'default' => 'small',
        );
        $options['timezone'] = array(
            'default' => '',
        );
        return $options;
    }
    
    /**
     * {@inheritdoc}
     */
    public function options_form(&$form, &$form_state) {
        $date_formats = array();
        $date_types = system_get_date_types();
        foreach ($date_types as $value) {
            $date_formats[$value['type']] = t('@date_format format', array(
                '@date_format' => $value['title'],
            )) . ': ' . format_date(REQUEST_TIME, $value['type']);
        }
        $form['date_format'] = array(
            '#type' => 'select',
            '#title' => t('Date format'),
            '#options' => $date_formats + array(
                'custom' => t('Custom'),
                'raw time ago' => t('Time ago'),
                'time ago' => t('Time ago (with "ago" appended)'),
                'today time ago' => t('Time ago (with "ago" appended) for today\'s date, but not for other dates'),
                'raw time hence' => t('Time hence'),
                'time hence' => t('Time hence (with "hence" appended)'),
                'raw time span' => t('Time span (future dates have "-" prepended)'),
                'inverse time span' => t('Time span (past dates have "-" prepended)'),
                'time span' => t('Time span (with "ago/hence" appended)'),
            ),
            '#default_value' => isset($this->options['date_format']) ? $this->options['date_format'] : 'small',
        );
        $form['custom_date_format'] = array(
            '#type' => 'textfield',
            '#title' => t('Custom date format'),
            '#description' => t('If "Custom", see the <a href="@url" target="_blank">PHP manual</a> for date formats. Otherwise, enter the number of different time units to display, which defaults to 2.', array(
                '@url' => 'http://php.net/manual/function.date.php',
            )),
            '#default_value' => isset($this->options['custom_date_format']) ? $this->options['custom_date_format'] : '',
            '#dependency' => array(
                'edit-options-date-format' => $this->supported_date_types(),
            ),
        );
        $form['second_date_format'] = array(
            '#type' => 'select',
            '#title' => t('Second date format'),
            '#options' => $date_formats + array(
                'custom' => t('Custom'),
            ),
            '#description' => t('The date format which will be used for rendering dates other than today.'),
            '#default_value' => isset($this->options['second_date_format']) ? $this->options['second_date_format'] : 'small',
            '#dependency' => array(
                'edit-options-date-format' => array(
                    'today time ago',
                ),
            ),
        );
        $form['second_date_format_custom'] = array(
            '#type' => 'textfield',
            '#title' => t('Custom date format of second date'),
            '#description' => t('If "Custom" is selected in "Second date format", see the <a href="@url" target="_blank">PHP manual</a> for date formats. Otherwise, enter the number of different time units to display, which defaults to 2.', array(
                '@url' => 'http://php.net/manual/function.date.php',
            )),
            '#default_value' => isset($this->options['second_date_format_custom']) ? $this->options['second_date_format_custom'] : '',
            // We have to use states instead of ctools dependency because dependency
            // doesn't handle multiple conditions.
'#states' => array(
                'visible' => array(
                    '#edit-options-date-format' => array(
                        'value' => 'today time ago',
                    ),
                    '#edit-options-second-date-format' => array(
                        'value' => 'custom',
                    ),
                ),
            ),
            // We have to use ctools dependency too because states doesn't add the
            // correct left margin to the element's wrapper.
'#dependency' => array(
                // This condition is handled by form API's states.
                // @code
                // 'edit-options-date-format' => array('today time ago'),
                // @endcode
'edit-options-second-date-format' => array(
                    'custom',
                ),
            ),
        );
        $form['timezone'] = array(
            '#type' => 'select',
            '#title' => t('Timezone'),
            '#description' => t('Timezone to be used for date output.'),
            '#options' => array(
                '' => t('- Default site/user timezone -'),
            ) + system_time_zones(FALSE),
            '#default_value' => $this->options['timezone'],
            '#dependency' => array(
                'edit-options-date-format' => array_merge(array(
                    'custom',
                ), array_keys($date_formats)),
            ),
        );
        parent::options_form($form, $form_state);
    }
    
    /**
     * Provide a list of all of the supported standard date types.
     *
     * @return array
     *   The list of supported formats.
     */
    private function supported_date_types() {
        return array(
            'custom',
            'raw time ago',
            'time ago',
            'today time ago',
            'raw time hence',
            'time hence',
            'raw time span',
            'time span',
            'raw time span',
            'inverse time span',
            'time span',
        );
    }
    
    /**
     * {@inheritdoc}
     */
    public function render($values) {
        $value = $this->get_value($values);
        // If the value isn't numeric, assume it's an SQL DATETIME.
        if (!empty($value) && !is_numeric($value)) {
            $value = strtotime($value);
        }
        if ($value) {
            $format = $this->options['date_format'];
            // The custom format can be either a number or a string, depending upon
            // what format is being used.
            $custom_format = NULL;
            if (in_array($format, $this->supported_date_types())) {
                $custom_format = $this->options['custom_date_format'];
            }
            $timezone = !empty($this->options['timezone']) ? $this->options['timezone'] : NULL;
            // Will be positive for a datetime in the past (ago), and negative for a
            // datetime in the future (hence).
            $time_diff = REQUEST_TIME - $value;
            switch ($format) {
                case 'raw time ago':
                    return format_interval($time_diff, is_numeric($custom_format) ? $custom_format : 2);
                case 'time ago':
                    $t_args = array(
                        '%time' => format_interval($time_diff, is_numeric($custom_format) ? $custom_format : 2),
                    );
                    return t('%time ago', $t_args);
                case 'today time ago':
                    $second_format = $this->options['second_date_format'];
                    $second_custom_format = $this->options['second_date_format_custom'];
                    if (format_date(REQUEST_TIME, 'custom', 'Y-m-d', $timezone) == format_date($value, 'custom', 'Y-m-d', $timezone)) {
                        return t('%time ago', array(
                            '%time' => format_interval($time_diff, is_numeric($custom_format) ? $custom_format : 2),
                        ));
                    }
                    elseif ($second_format == 'custom') {
                        if ($second_custom_format == 'r') {
                            return format_date($value, $second_format, $second_custom_format, $timezone, 'en');
                        }
                        return format_date($value, $second_format, $second_custom_format, $timezone);
                    }
                    else {
                        return format_date($value, $this->options['second_date_format'], '', $timezone);
                    }
                case 'raw time hence':
                    return format_interval(-$time_diff, is_numeric($custom_format) ? $custom_format : 2);
                case 'time hence':
                    return t('%time hence', array(
                        '%time' => format_interval(-$time_diff, is_numeric($custom_format) ? $custom_format : 2),
                    ));
                case 'raw time span':
                    return ($time_diff < 0 ? '-' : '') . format_interval(abs($time_diff), is_numeric($custom_format) ? $custom_format : 2);
                case 'inverse time span':
                    return ($time_diff > 0 ? '-' : '') . format_interval(abs($time_diff), is_numeric($custom_format) ? $custom_format : 2);
                case 'time span':
                    return t($time_diff < 0 ? '%time hence' : '%time ago', array(
                        '%time' => format_interval(abs($time_diff), is_numeric($custom_format) ? $custom_format : 2),
                    ));
                case 'custom':
                    if ($custom_format == 'r') {
                        return format_date($value, $format, $custom_format, $timezone, 'en');
                    }
                    return format_date($value, $format, t($custom_format), $timezone);
                default:
                    // The custom format is not used in this scenario.
                    return format_date($value, $format, '', $timezone);
            }
        }
    }

}