how to create dynamic column aliases

I am trying to create a query that computes procedure run time statistics for the last 7 days. i have no problems createing the query, but how can i have the column aliases to bear the current date?

Ideal results:
property process 7/12/04 7/13/04 7/14/04 7/15/04 7/16/04 7/17/04 7/18/04

declare @start smalldatetime
select @start = convert(varchar(10), dateadd(dd,-4, getdate()),101)

declare @end smalldatetime
select @end = convert(varchar(10), getdate(),101)

declare @table_1 Table (
Property varchar(6)
,process varchar(50)
,steps_order int
,business_date smalldatetime
,run_time int
)
declare @table_2 Table (
Property varchar(6)
,process varchar(50)
,steps_order int
,business_date smalldatetime
,run_time int
)
declare @table_3 Table (
Property varchar(6)
,process varchar(50)
,steps_order int
,business_date smalldatetime
,run_time int
)
declare @table_4 Table (
Property varchar(6)
,process varchar(50)
,steps_order int
,business_date smalldatetime
,run_time int
)
declare @table_5 Table (
Property varchar(6)
,process varchar(50)
,steps_order int
,business_date smalldatetime
,run_time int
)

insert @table_1
select property, process, steps_order, business_date, datediff(ms, start_time, end_time) from night_audit where business_date = @end
AND Property not like 'TR%'
order by property, process

insert @table_2
select property, process, steps_order, business_date, datediff(ms, start_time, end_time) from night_audit where business_date = dateadd(dd, -3, @start)
AND Property not like 'TR%'
order by property, process

insert @table_3
select property, process, steps_order, business_date, datediff(ms, start_time, end_time) from night_audit where business_date = dateadd(dd, -2, @start)
AND Property not like 'TR%'
order by property, process

insert @table_4
select property, process, steps_order, business_date, datediff(ms, start_time, end_time) from night_audit where business_date = dateadd(dd, -1, @start)
AND Property not like 'TR%'
order by property, process


insert @table_5
select property, process, steps_order, business_date, datediff(ms, start_time, end_time) from night_audit where business_date = @start
AND Property not like 'TR%'
order by property, process

select a.property,
a.process
,a.steps_order
,e.run_time as [@start]
,d.run_time as [dateadd(dd, -1, @start)]
,c.run_time as [dateadd(dd, -2, @start)]
,b.run_time as [dateadd(dd, -3, @start)]
,a.run_time as [dateadd(dd, 0, @end)]
From @table_1 a JOIN @table_2 b ON a.Process = b.Process AND a.property = b.property
JOIN @table_3 c ON a.Process = c.Process AND a.property = c.property
JOIN @table_4 d ON a.Process = d.Process AND a.property = d.property
JOIN @table_5 e ON a.Process = e.Process AND a.property = e.property
order by a.property, a.run_time desc, a.process