using between with dates

I'm trying the following:

ship_date between '04/30/2010' AND '04/30/2010' + 14

But this returns:

ERROR:  invalid input syntax for integer: "04/30/2010"

Can I use between with dates?

--
Until later, Geoffrey

"I predict future happiness for America if they can prevent
the government from wasting the labors of the people under
the pretense of taking care of them."
- Thomas Jefferson