Check out example codes for "mutiple date formats in snowflake during copy". It will help you in understanding the concepts better.

Code Example 1

COPY INTO MY_TABLE (NAME, DOB, DOD, HAIR_COLOUR) 
FROM (
   SELECT $1, TO_DATE($2,'YYYYMMDD'), TO_DATE($3,'MM-DD-YYYY'), $4 
   FROM @MY_STAGE/mypeeps (file_format => 'MY_CSV_FORMAT') 
)
ON_ERROR = CONTINUE;

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