How to show time in node.tpl.php that takes the configured timezone settings into account?

Question

I have a custom content type and it has a date-time field. I have also a custom node.tpl.php to display this content type.

The timezone settings is done (at admin/config/regional/settings, Europe/Istanbul, +0300).

This is the code I print the date-time field.

<?php print format_date(strtotime($node->field_event_datetime[LANGUAGE_NONE][0]['value']), $type = 'custom_event', $format = '', $timezone = 'Europe/Istanbul', $langcode = 'tr')?>

Although I set everything, it still shows the wrong time. For example it should be 10.00 but it shows 07.00. I also tried to set the timezone NULL but nothing changed.

How to solve this problem?