It might be a bit unorthodox, but this worked for me:
Replace(Replace(Replace( Replace(Replace(Replace( Replace(Replace(Replace( Replace(Replace(Replace( Format('DATEn[Raw], 'DTDATE9.'), 'JAN', '-01-', _First_), 'FEB', '-02-', _First_), 'MAR', '-03-', _First_), 'APR', '-04-', _First_), 'MAY', '-05-', _First_), 'JUN', '-06-', _First_), 'JUL', '-07-', _First_), 'AUG', '-08-', _First_), 'SEP', '-09-', _First_), 'OCT', '-10-', _First_), 'NOV', '-11-', _First_), 'DEC', '-12-', _First_)
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