prbolems using HTML dropdown in asp.net

i have  2 html dropdown(SELECT ) controls
one is having month other day
this values are stored in databse
i hve a javascript function for populating the day drop with the nos of days depending on month selected
problems
1)monthdropdown.value gives blank when storing the month in database
2)when i retrive the stored date suppose 2010-08-06 usingmonthdropdown.selectedindex= DatePart(DateInterval.Month, READER("DATE"))
i get 08 ie aug when debugging but in dropdown the previous month is displayed july
3) 06 get stored in date databse but when retriving  i get teh day dropdown blank
...