nextcloud/apps/calendar/templates/settings.php

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<form id="calendar">
<fieldset class="personalblock">
<label for="timezone"><strong><?php echo $l->t('Timezone');?></strong></label>
<select id="timezone" name="timezone">
<?php foreach($_['timezones'] as $timezone):
if ( preg_match( '/^(America|Antartica|Arctic|Asia|Atlantic|Europe|Indian|Pacific)\//', $timezone ) ):
$ex=explode('/', $timezone, 2);//obtain continent,city
if ($continent!=$ex[0]):
if ($continent!="") echo '</optgroup>';
echo '<optgroup label="'.$ex[0].'">';
endif;
$city=$ex[1];
$continent=$ex[0];
echo '<option value="'.$timezone.'"'.($_['timezone'] == $timezone?' selected="selected"':'').'>'.$city.'</option>';
endif;
endforeach;?>
</select><span id="timezoneerror"></span>
</fieldset>
</form>