nextcloud/apps/calendar/templates/settings.php

<?php
/**
 * Copyright (c) 2011 Bart Visscher <bartv@thisnet.nl>
 * Copyright (c) 2012 Georg Ehrke <ownclouddev at georgswebsite dot de>
 * This file is licensed under the Affero General Public License version 3 or
 * later.
 * See the COPYING-README file.
 */
?>
<form id="calendar">
	<fieldset class="personalblock">
	<legend><?php echo $l->t('Calendar'); ?></legend>
		<table class="nostyle">
			<tr><td><label for="timezone" class="bold"><?php echo $l->t('Timezone');?></label></td><td><select style="display: none;" id="timezone" name="timezone">
				<?php
				$continent = '';
				foreach($_['timezones'] as $timezone):
					$ex=explode('/', $timezone, 2);//obtain continent,city
					if (!isset($ex[1])) {
						$ex[1] = $ex[0];
						$ex[0] = "Other";
					}
					if ($continent!=$ex[0]):
						if ($continent!="") echo '</optgroup>';
						echo '<optgroup label="'.$ex[0].'">';
					endif;
					$city=strtr($ex[1], '_', ' ');
					$continent=$ex[0];
					echo '<option value="'.$timezone.'"'.($_['timezone'] == $timezone?' selected="selected"':'').'>'.$city.'</option>';
				endforeach;?>
			</select><input type="checkbox" name="timezonedetection" id="timezonedetection"><label for="timezonedetection"><?php echo $l->t('Check always for changes of the timezone'); ?></label></td></tr>

			<tr><td><label for="timeformat" class="bold"><?php echo $l->t('Timeformat');?></label></td><td>
				<select style="display: none; width: 60px;" id="timeformat" title="<?php echo "timeformat"; ?>" name="timeformat">
					<option value="24" id="24h"><?php echo $l->t("24h"); ?></option>
					<option value="ampm" id="ampm"><?php echo $l->t("12h"); ?></option>
				</select>
			</td></tr>

			<tr><td><label for="firstday" class="bold"><?php echo $l->t('First day of the week');?></label></td><td>
				<select style="display: none;" id="firstday" title="<?php echo "First day"; ?>" name="firstday">
					<option value="mo" id="mo"><?php echo $l->t("Monday"); ?></option>
					<option value="su" id="su"><?php echo $l->t("Sunday"); ?></option>
				</select>
			</td></tr>

            <tr><td><label for="" class="bold"><?php echo $l->t('Cache');?></label></td><td>
                <input id="cleancalendarcache" type="button" class="button" value="<?php echo $l->t('Clear cache for repeating events');?>">
            </td></tr>

        </table>

		<?php echo $l->t('Calendar CalDAV syncing addresses'); ?> (<a href="http://owncloud.org/synchronisation/" target="_blank"><?php echo $l->t('more info'); ?></a>)
		<dl>
		<dt><?php echo $l->t('Primary address (Kontact et al)'); ?></dt>
		<dd><code><?php echo OCP\Util::linkToRemote('caldav'); ?></code></dd>
		<dt><?php echo $l->t('iOS/OS X'); ?></dt>
		<dd><code><?php echo OCP\Util::linkToRemote('caldav'); ?>principals/<?php echo OCP\USER::getUser(); ?></code>/</dd>
		</dl>
        </fieldset>
</form>