FormatDate 用户自定义的一个函数!

create   function   [ dbo ] . [ FormatDate ]
     (
      @dDate   datetime            -- Date value to be formatted
     , @sFormat   varchar ( 40 )     -- Format for date value
     )
returns   varchar ( 40 )
as
begin

      --  Insert the Month
      --  ~~~~~~~~~~~~~~~~
      set   @sFormat   =   replace ( @sFormat , ' MMMM ' , datename ( month , @dDate ))
      set   @sFormat   =   replace ( @sFormat , ' MMM ' , convert ( char ( 3 ), datename ( month , @dDate )))
      set   @sFormat   =   replace ( @sFormat , ' MM ' , right ( convert ( char ( 4 ), @dDate , 12 ), 2 ))
      set   @sFormat   =   replace ( @sFormat , ' M1 ' , convert ( varchar ( 2 ), convert ( int , right ( convert ( char ( 4 ), @dDate , 12 ), 2 ))))

      --  Insert the Day
      --  ~~~~~~~~~~~~~~
      set   @sFormat   =   replace ( @sFormat , ' DDDD ' , datename (weekday, @dDate ))
      set   @sFormat   =   replace ( @sFormat , ' DDD ' , convert ( char ( 3 ), datename (weekday, @dDate )))
      set   @sFormat   =   replace ( @sFormat , ' DD ' , right ( convert ( char ( 6 ), @dDate , 12 ), 2 ))
      set   @sFormat   =   replace ( @sFormat , ' D1 ' , convert ( varchar ( 2 ), convert ( int , right ( convert ( char ( 6 ), @dDate , 12 ), 2 ))))

      --  Insert the Year
      --  ~~~~~~~~~~~~~~~
      set   @sFormat   =   replace ( @sFormat , ' YYYY ' , convert ( char ( 4 ), @dDate , 112 ))
      set   @sFormat   =   replace ( @sFormat , ' YY ' , convert ( char ( 2 ), @dDate , 12 ))

      --  Return the function's value
      --  ~~~~~~~~~~~~~~~~~~~~~~~~~~~  
      return   @sFormat
end