how to convert date yyyymmdd to yyyy:mm:dd in hana calculated coloumn

Hi experts,

i have requirement in hana to display the date and time as shown below

          yyyy:mm:dd  and  hh:mm:ss

but as of now my date is displaying like yyyymmdd and time is displaying like hhmmss.

the date field is AUSVN  and AUZTV whose data type is dats(8) and tims(6).

kindly help how can i convert my date in to above said format through calculated column

Thanks

prashant