MySQL时间函数from_unixtime()date_format()unix_timestamp()now()使用说明

now() 当前时间

mysql> select now();

+---------------------+

| now() |

+---------------------+

| 2018-09-10 19:20:19 |

+---------------------+

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unix_timestamp() 当前时间戳

mysql> select unix_timestamp();

+------------------+

| unix_timestamp() |

+------------------+

| 1536578429 |

+------------------+

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unix_timestamp(now()) 当前时间转换成时间戳

mysql> select unix_timestamp(now());

+-----------------------+

| unix_timestamp(now()) |

+-----------------------+

| 1536578445 |

+-----------------------+

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unix_timestamp(‘2018-08-08’) 指定时间转换成时间戳

mysql> select unix_timestamp('2018-08-08');

+------------------------------+

| unix_timestamp('2018-08-08') |

+------------------------------+

| 1533657600 |

+------------------------------+

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from_unixtime(1533657600) 将时间戳转换为时间 默认格式 ‘%Y-%m-%d %H:%i:%s’

mysql> select from_unixtime(1533657600);

+---------------------------+

| from_unixtime(1533657600) |

+---------------------------+

| 2018-08-08 00:00:00 |

+---------------------------+

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from_unixtime(1533657600, ‘%Y-%m-%d’) 将时间戳转换为时间 并进行格式化

mysql> select from_unixtime(1533657600, '%Y-%m-%d');

+---------------------------------------+

| from_unixtime(1533657600, '%Y-%m-%d') |

+---------------------------------------+

| 2018-08-08 |

+---------------------------------------+

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查询时间戳字段 转换为时间格式显示

mysql> select from_unixtime(ctime, '%Y-%m-%d') from logs limit 1;

+----------------------------------+

| from_unixtime(ctime, '%Y-%m-%d') |

+----------------------------------+

| 2018-09-18 |

+----------------------------------+

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where时间戳字段

mysql> select count(*) from logs where from_unixtime(ctime, '%Y%m%d')=20180808 limit 1;

+----------+

| count(*) |

+----------+

| 12345 |

+----------+

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date_format() 将时间进行格式化显示

mysql> select date_format(now(), '%Y/%m/%d');

+--------------------------------+

| date_format(now(), '%Y/%m/%d') |

+--------------------------------+

| 2018/08/08 |

+--------------------------------+

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where时间字段

mysql> select count(*) from logs where date_format(cdate, '%Y%m%d')=20180910 limit 1;

+----------+

| count(*) |

+----------+

| 123 |

+----------+

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版权声明：本文为CSDN博主「gocuber」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。

原文链接：https://blog.csdn.net/gocuber/article/details/80195591