[amibroker] Coding help for First Hour range

[vichooo_1999]

Hi

I need coding help to calculate the first hou trading range.
the followingcode does not work:
period=( TimeNum() >= 095400 AND TimeNum()<= 105500) AND(DateNum()
==LastValue(DateNum()));

u=HHV(H,period);
w=LLV(L,period);

Any help will be highly appreciated

thanks