Update table: extract max(hour).

Hello,

I am trying to update one table based on another table data as follows:

TableStatus containts fields date (date), hour
(time), IDcode (text), status (text).
TableProduct contains fields state (text),
datestate (date), IDcode (text).

I want to update state and datestate based on the last status in
Tablestatus.
The problem is that I cannot extract a max(hour) from PG, and using
max(date) is not sufficient, as 2 status could be entered on the same day on
two different times.

I am unsure how to resolve this problem.
TIA