Convert Timestamp

Hi Together,

first I want to thank you for this nice tool rapidminer.
I am new on this, but having a question.

I am reading datas from db2 -> i can see the datas and everythink is okay.

One colum of my datas contains dates/time information in the form:
1090414114957898 (that means 2009 04.14. 11Hour 49Minutes 57seconds 898miliseconds)

Can someone tell my how i can convert the date value 1090414114957898 (type real) in a human readable format?
I tried the preprocessing operator but without a success.
I think the most operators able to handle a date are for converting date to number?

Thanks for ur help

Chris