Or use csv2xls out of Text::CSV_XS' examples folder:

$ csv2xls --help
usage: csv2xls [-s <sep>] [-q <quot>] [-w <width>] [-d <dtfmt>]
               [-o <xls>] [file.csv]
       -s <sep>   use <sep>   as seperator char. Auto-detect, default 
+= ','
                  The string "tab" is allowed.
       -e <esc>   use <sep>   as seperator char. Auto-detect, default 
+= ','
                  The string "undef" is allowed.
       -q <quot>  use <quot>  as quotation char. Default = '"'
                  The string "undef" will disable quotation.
       -w <width> use <width> as default minimum column width (4)
       -o <xls>   write output to file named <xls>, defaults
                  to input file name with .csv replaced with .xls
                  if from standard input, defaults to csv2xls.xls
       -F         allow formula's. Otherwise fields starting with
                  an equal sign are forced to string
       -f         force usage of <xls> if already exists (unlink befor
+e use)
       -d <dtfmt> use <dtfmt> as date formats.   Default = 'dd-mm-yyyy
+'
       -D cols    only convert dates in columns <cols>. Default is eve
+rywhere.
       -u         CSV is UTF8
       -v [<lvl>] verbosity (default = 1)
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