time_round

description

Syntax

DATETIME TIME_ROUND(DATETIME expr)

DATETIME TIME_ROUND(DATETIME expr, INT period)

DATETIME TIME_ROUND(DATETIME expr, DATETIME origin)

DATETIME TIME_ROUND(DATETIME expr, INT period, DATETIME origin)

The function name TIME_ROUND consists of two parts, Each part consists of the following optional values.

  • TIME: SECOND, MINUTE, HOUR, DAY, WEEK, MONTH, YEAR
  • ROUND: FLOOR, CEIL

Returns the upper/lower bound of expr.

  • period specifies how many TIME units, the default is 1.
  • origin specifies the start time of the period, the default is 1970-01-01T00:00:00, the start time of WEEK is Sunday, which is 1970-01-04T00:00:00. Could be larger than expr.
  • Please try to choose common period, such as 3 MONTH, 90 MINUTE. If you set a uncommon period, please also specify origin.

example

  2. MySQL> SELECT YEAR_FLOOR('20200202000000');
  3. +------------------------------+
  4. | year_floor('20200202000000') |
  5. +------------------------------+
  6. | 2020-01-01 00:00:00          |
  7. +------------------------------+
  10. MySQL> SELECT MONTH_CEIL(CAST('2020-02-02 13:09:20' AS DATETIME), 3); --quarter
  11. +--------------------------------------------------------+
  12. | month_ceil(CAST('2020-02-02 13:09:20' AS DATETIME), 3) |
  13. +--------------------------------------------------------+
  14. | 2020-04-01 00:00:00                                    |
  15. +--------------------------------------------------------+
  18. MySQL> SELECT WEEK_CEIL('2020-02-02 13:09:20', '2020-01-06'); --monday
  19. +---------------------------------------------------------+
  20. | week_ceil('2020-02-02 13:09:20', '2020-01-06 00:00:00') |
  21. +---------------------------------------------------------+
  22. | 2020-02-03 00:00:00                                     |
  23. +---------------------------------------------------------+
  26. MySQL> SELECT MONTH_CEIL(CAST('2020-02-02 13:09:20' AS DATETIME), 3, CAST('1970-01-09 00:00:00' AS DATETIME)); --next rent day
  27. +-------------------------------------------------------------------------------------------------+
  28. | month_ceil(CAST('2020-02-02 13:09:20' AS DATETIME), 3, CAST('1970-01-09 00:00:00' AS DATETIME)) |
  29. +-------------------------------------------------------------------------------------------------+
  30. | 2020-04-09 00:00:00                                                                             |
  31. +-------------------------------------------------------------------------------------------------+

keyword

TIME_ROUND