Yes....unix_timestamps and mysql timestamps are different formats. use the date_format() function in mysql to format your timestamps.
SELECT DATE_FORMAT(your_date_column,"%H:%i - %j/%n") AS f_date FROM your_table
fetch row and use $newValues[f_date] as the formatted value.
That's an example. check the mysql manual for all of the options. I don't think the % codes are the same in date() and DATE_FORMAT(), so you'll have to adjust.
www.mysql.com/documentation/mysql/bychapter/
Look at chapter 7, date and time functions.
---John Holmes...