declare @cmd varchar(2048)
declare @cols smallint = 40

;with cols as (
select top (@cols) ', col_'+convert(varchar(10),row_number() over (order by (select 1/0)))+' int'  [col]
from master.dbo.spt_values 
)
select @cmd='create table dbo.tbl'+convert(varchar(10),@cols)+' (id int identity,start_date datetime,end_date datetime' + string_agg(col,'')+')'
from cols 

print @cmd 
--exec(@cmd)