SET @start_date = 2017-12-20 00:00:00
SET @end_date = 2019-04-30 23:59:59
SET @type = 'Q3'

period     |   num_of_days
Q3_17_18   |   71 (dec 2017 from start_date + jan, feb 2018 = 12+31+28)
Q3_18_19   |   90 (dec 2018 + jan, feb 2019 = 31+31+28)

datetime_value        |  value  |
2018-04-21 00:01:00   |   100   |
2018-04-21 00:02:00   |   400   |
2018-04-21 00:03:00   |   200   |
...
2019-02-03 00:16:00   |   100   |
2018-04-21 00:17:00   |   500   |