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
原文地址：https://www.cnblogs.com/apolloren/p/12106496.html