一、取一個月以前的時間:mysql
1)mysql> select date_sub(curdate(), interval 1 month); #當前日期一個月以前的日期sql
+---------------------------------------+
| date_sub(curdate(), interval 1 month) |
+---------------------------------------+
| 2017-03-28 |
+---------------------------------------+orm
2)mysql> select date_sub(now(), interval 1 month); #當前日期一個月以前的時間form
+-----------------------------------+
| date_sub(now(), interval 1 month) |
+-----------------------------------+
| 2017-03-28 16:00:04 |
+-----------------------------------+date
二、指定獲取時間格式:select
1)mysql> select date_format(date_sub(now(), interval 1 month), '%y-%m-%d'); #當前日期一個月以前是多少年月日時間
+------------------------------------------------------------+
| date_format(date_sub(now(), interval 1 month), '%y-%m-%d') |
+------------------------------------------------------------+
| 17-03-28 |
+------------------------------------------------------------+日期
2)mysql> select date_format(date_sub(now(), interval 1 month), '%Y-%M-%D'); #當前日期一個月以前是多少年月日arc
+------------------------------------------------------------+
| date_format(date_sub(now(), interval 1 month), '%Y-%M-%D') |
+------------------------------------------------------------+
| 2017-March-28th |
+------------------------------------------------------------+
3)mysql> select date_format(date_sub(now(), interval 1 month), '%y-%m'); # 當前日期一個月以前是多少年月
+---------------------------------------------------------+
| date_format(date_sub(now(), interval 1 month), '%y-%m') |
+---------------------------------------------------------+
| 17-03 |
+---------------------------------------------------------+
三、日期加減
1)mysql> select interval 1 month + '2017-04-28'; # 某一日期1個月以後的日期是多少
+---------------------------------+
| interval 1 month + '2017-04-28' |
+---------------------------------+
| 2017-05-28 |
+---------------------------------+
2)mysql> select '2017-04-28' + interval 10 day; # 某一日期10天以後的日期是多少
+--------------------------------+
| '2017-04-28' + interval 10 day |
+--------------------------------+
| 2017-05-08 |
+--------------------------------+
3)mysql> select '2017-04-28' - interval 10 day; # 某一日期10天以前的日期是多少
+--------------------------------+
| '2017-04-28' - interval 10 day |
+--------------------------------+
| 2017-04-18 |
+--------------------------------+
四、時間格式修改
1)mysql> select date_format(now(), '%W %M %Y'); #時間格式修改成星期 月份 年份格式
+--------------------------------+
| date_format(now(), '%W %M %Y') |
+--------------------------------+
| Friday April 2017 |
+--------------------------------+
2)mysql> select date_format(now(), '%H:%i:%s'); #24小時制時間顯示
+--------------------------------+
| date_format(now(), '%H:%i:%s') |
+--------------------------------+
| 16:22:32 |
+--------------------------------+
3)mysql> select date_format(now(), '%h:%i:%s'); #12小時制時間顯示
+--------------------------------+ | date_format(now(), '%h:%i:%s') | +--------------------------------+ | 04:23:05 | +--------------------------------+