Is there any way to get a drop down list of time zones?

by

Enter wp_timezone_choice():

<select>
    <?php echo wp_timezone_choice( 'UTC' ) ?>
</select>

Make sure to check out the documentation link, but the parameters are:

$selected_zone (string) (Required) Selected timezone.

$locale (string) (Optional) Locale to load the timezones in. Default
current site locale.