how to use a date range in a join

trying to do something like

select     d.day,          c.name
from       [dates between day1 and day2] d
left join  c.some_table;

but cannot figure out what to put into the brackets.




____________________________________________________________________________________
Finding fabulous fares is fun.  
Let Yahoo! FareChase search your favorite travel sites to find flight and hotel bargains.
http://farechase.yahoo.com/promo-generic-14795097