How to edit merge fields in eMail templates?

How to edit merge fields in eMail templates?

Hi,

I would like to separate date and time in my eMail template

the field ${Interviews.Start DateTime} produces dd-mm-yyyy hh.mm as output,
while I would like :
your appointment is scheduled DATE dd-mm-yyyy, the meeting starts  hh.mm and ends  hh.mm

All help appreciated

regards,
Wouter