thanks for the help
here are my code for day

symbol mon = 0
symbol tue = 1
symbol wed = 2
symbol thu = 3
symbol fri = 4
symbol sat = 5
symbol sun = 6

hour var byte
day var byte
day = 0 ' initial day at mon when program run

if hour > 24 then
day = day + 1
endif

if day > 7 then
day = 0
endif

lcdout $fe,$c0, dec3 day

*the display only show 000, not mon.
how i write the code to display date:month:year