Need help to create file with name and current time stamp.

Question

I need to create .xlsx file exporting data from sql database and file name would be 'FileName' and current yyyymmdd. 
I'm trying to use following code but it's keep saying  incorrect syntax near "+".
EXEC p_CreateExcel 'sql64', 'NewFile', '\\hrfile1\Shared\Buying Report\NewFile'
+ CAST(YEAR(CURRENT_TIMESTAMP) AS VARCHAR)
+ RIGHT('00'+CAST(MONTH(CURRENT_TIMESTAMP) AS VARCHAR),2)
+ RIGHT('00'+CAST(DAY(CURRENT_TIMESTAMP) AS VARCHAR),2)+'.xlsx'

Answer 1

This is what I have on EXEC p_CreateExcel
USE [XePro01]
GO
/****** Object:  StoredProcedure [dbo].[p_CreateExcel]    Script Date: 02/26/2015 11:27:35 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER procedure [dbo].[p_CreateExcel]
        @db_name varchar(100),
        @table_name varchar(100), 
        @file_name varchar(100)
as
--Generate column names as a recordset
declare @columns varchar(8000), @sql varchar(8000), @data_file varchar(100)
select 
        @columns=coalesce(@columns+',','')+column_name+' as '+column_name 
from 
        information_schema.columns
where 
        table_name=@table_name
select @columns=''''''+replace(replace(@columns,' as ',''''' as '),',',',''''')
--Create a dummy file to have actual data
select @data_file=substring(@file_name,1,len(@file_name)-charindex('\',reverse(@file_name)))+'\data_file.xls'
--Generate column names in the passed EXCEL file
set @sql='exec master..xp_cmdshell ''bcp "set fmtonly off select * from (select '+@columns+') as t" queryout "'+@file_name+'" -c -t, -T -S'''
exec(@sql)
--Generate data in the dummy file
set @sql='exec master..xp_cmdshell ''bcp "set fmtonly off select * from XeProgst01.dbo.'+@table_name+'" queryout "'+@data_file+'" -c -t, -T -S'''
exec(@sql)
--Copy dummy file to passed EXCEL file
set @sql= 'exec master..xp_cmdshell ''type '+@data_file+' >> '+@file_name+''''
exec(@sql)
--Delete dummy file 
set @sql= 'exec master..xp_cmdshell ''del '+@data_file+''''
exec(@sql)
GO