DATETIME: Eight bytes: A four-byte integer packed as YYYY×10000 + MM×100 + DD A four-byte integer packed as HH×10000 + MM×100 + SS
Storing UNIX time as an integer would be silly, considering:
TIMESTAMP: A four-byte integer representing seconds UTC since the epoch ('1970-01-01 00:00:00' UTC)
DATETIME: Eight bytes: A four-byte integer packed as YYYY×10000 + MM×100 + DD A four-byte integer packed as HH×10000 + MM×100 + SS
Storing UNIX time as an integer would be silly, considering:
TIMESTAMP: A four-byte integer representing seconds UTC since the epoch ('1970-01-01 00:00:00' UTC)