select with time

[pelegk2]

i have this select

SELECT from_unixtime(TAARICH_HASPAKA),from_unixtime(TAARICH_TEUDA,'%d.%m.%Y %h%:%i:%s'),sent FROM order_header WHERE TAARICH_TEUDA!=''and from_unixtime(TAARICH_TEUDA,'%d.%m.%Y %h%:%i:%s')<'23.02.2005 8:00:00'

when i run this query and for example the
TAARICH_TEUDA=='23.02.2005 12:14:00'
this value shouldn't been show beacuse i asked for

from_unixtime(TAARICH_TEUDA,'%d.%m.%Y %h%:%i:%s')<'23.02.2005 8:00:00'

any idea?
thnaks in advance
peleg