support writing date, datetime columns when saving to excel

Author: Zhuang Dai

rsv/src/cmd_desc.rs

@@ -467,7 +467,7 @@ Options:
   -S, --sheet <SHEET>                Get the nth worksheet of EXCEL file [default: 0]
   -t, --text-columns <TEXT_COLUMNS>  Columns to format as text (e.g., "0,2") [default:]
   -d, --date-columns <DATE_COLUMNS>  Columns (e.g., "0,2") to format as date      
-      --date-format  <DATE_FORMAT>   Column date formats (e.g., "%Y-%m-%d,%m/%d/%Y %H:%M:%S") [default: auto parse]
+      --date-formats  <DATE_FORMAT>  Column date formats (e.g., "%Y-%m-%d,%m/%d/%Y %H:%M:%S") [default: auto parse]
   -h, --help                         Print help
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