Hi Djordje,
The "time" field is automatically invoked when you use a string field with a time picture. I agree an explicit "Time" field type would probably be a bit more intuitive.
Incidentally the time field itself is very smart. regardless of the time picture used, it figures out what time the user meant, whatever they typed in. (So the time picture is really used just to display the current value of the field.)
for example you might specify @t4 (hh:mm:ss) but any of the following would work; (and probably a few more as well)
3
3pm
3am
3:00
3:00:00
3:00am
and so on.
Cheers
Bruce