Executing SP within Sql server

Hi

Am a newbie in sql server pls help me to sort this issue

Am having a table

create table table1
(
id int primary key,
dob date
)

with some values inserted

insert into table1 values(1,'1990-12-12')
insert into table1 values(2,'1991-10-10')

and i have created a SP which accept dob and gives the result.

create proc sp1 @d date
as
select * from table1 where dob=@d

SP works perfectly when execute by command and passing the date value but when i execute the same SP with execute SP window in sql server by passing the date value its giving error 

This is the corresponding code generated

DECLARE@return_value int

EXEC@return_value = [dbo].[sp1]
@d = 1992-12-12

SELECT'Return Value' = @return_value

GO

and Error is 

i understood the issue that i have  to passe the value with single quotes.But the same thing will work with datetime without single quotes

So pls help me ,is this is the default mechanism or any error from my side

Waiting for your response..

thanks in advance