problem insert time into column timestamp

When working with Ingres, it is possible to create a field "date"
and insert into this a time value e.g. '10:12:12'
the current date is assigned automatically by Ingres
e.g. '31/07/2002 10:12:12'

When working with Postgres, I receive an error when trying to insert a
time value into a timestamp field
gedis30=# create table pippo (aa timestamp)\g

gedis30=# insert into pippo (aa) values('10:12:12')\g
ERROR: Bad timestamp external representation '10:12:12'

How can I solve this problem ?

Bye !!
Frank Lupo (Wolf) !!

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