kou commented on PR #38555:
URL: https://github.com/apache/arrow/pull/38555#issuecomment-1790063434

   It may cause an issue. We use the value in 
https://github.com/apache/arrow-site/blob/69bcbde1906af9e1b463484cdb1528986210ca89/arrow.rdf#L65
 . It uses the value as-is for now. So both of `"2023-11-01"` (string) and 
`2023-11-01` (date) work. But if want to change output format, we can't do it 
with a string. We need a date value for it.
   
   FYI:
   
   If we quote, the value is processed as a string:
   
   ```console
   $ ruby -r date -r yaml -e 'pp YAML.safe_load("date: \"2023-11-01\"", 
permitted_classes: [Date])'
   {"date"=>"2023-11-01"}
   ```
   
   If we don't quote, the value is processed as a date:
   
   ```console
   $ ruby -r date -r yaml -e 'pp YAML.safe_load("date: 2023-11-01", 
permitted_classes: [Date])'
   {"date"=>#<Date: 2023-11-01 ((2460250j,0s,0n),+0s,-Infj)>}
   ```
   
   


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