Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/13912
  
    Thank you for your comment @srowen !
    I did this for two reasons. Firstly, it can't write and read back the dates 
or timestamps but it might have to be converted manually by users if it writes 
them as long values. The other reason is consistency with JSON data source. 
JSON writes dates and timestamps in the format as above.


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