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// Create from and to date values for each item, adjusted to
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$db_tz = date_get_timezone_db($tz_handling, isset($item->$tz_alias) ? $item->$tz_alias : $display_timezone_name);
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$to_zone = date_get_timezone($tz_handling, isset($item->$tz_alias) ? $item->$tz_alias : $display_timezone_name);