SELECT '2017-01-01' + INTERVAL `d`.`dayOfYear` DAY + INTERVAL `h`.`hour` HOUR
  FROM (
    SELECT (`c`.`num`*100+`d`.`num`*10+`s`.`num`) AS `dayOfYear`
      FROM (
        SELECT 0 AS `num`
        UNION SELECT 1
        UNION SELECT 2
        UNION SELECT 3
        UNION SELECT 4
        UNION SELECT 5
        UNION SELECT 6
        UNION SELECT 7
        UNION SELECT 8
        UNION SELECT 9
    ) AS `s`
    JOIN (
      SELECT 0 AS `num`
        UNION SELECT 1
        UNION SELECT 2
        UNION SELECT 3
        UNION SELECT 4
        UNION SELECT 5
        UNION SELECT 6
        UNION SELECT 7
        UNION SELECT 8
        UNION SELECT 9
      ) AS `d` ON TRUE
      JOIN (
        SELECT 0 AS `num`
        UNION SELECT 1
        UNION SELECT 2
        UNION SELECT 3
        UNION SELECT 4
        UNION SELECT 5
        UNION SELECT 6
        UNION SELECT 7
        UNION SELECT 8
        UNION SELECT 9
      ) AS `c` ON TRUE
      HAVING `dayOfYear` < DAYOFYEAR('2017-12-31') 
  ) AS `d`
  JOIN (
    SELECT 0 AS `hour`
    UNION SELECT 1
    UNION SELECT 2
    UNION SELECT 3
    UNION SELECT 4
    UNION SELECT 5
    UNION SELECT 6
    UNION SELECT 7
    UNION SELECT 8
    UNION SELECT 9
    UNION SELECT 10
    UNION SELECT 11
    UNION SELECT 12
    UNION SELECT 13
    UNION SELECT 14
    UNION SELECT 15
    UNION SELECT 16
    UNION SELECT 17
    UNION SELECT 18
    UNION SELECT 19
    UNION SELECT 20
    UNION SELECT 21
    UNION SELECT 22
    UNION SELECT 23
  ) AS `h` ON TRUE