MySql 根据时区偏移量搜索时间戳

Question

我创建了一个示例 table，其场景与我的原始示例相同。 Table 名称 "records" 在数据库中 "test"

数据库时区设置为 UTC (SET time_zone = "+00:00";)

`records` (`id`, `name`, `time_created`)

(1,  'motion', '2017-09-13 16:20:41'),
(2,  'motion', '2017-09-13 16:20:57'),
(3,  'motion', '2017-09-13 16:21:24'),
(4,  'motion', '2017-09-13 16:21:40'),
(5,  'motion', '2017-09-13 16:26:38'),
(6,  'motion', '2017-09-13 17:09:00'),
(7,  'motion', '2017-09-13 17:09:16'),
(8,  'motion', '2017-09-13 22:14:37'),
(9,  'motion', '2017-09-13 22:23:53'),
(10, 'motion', '2017-09-13 22:24:08'),
(11, 'motion', '2017-09-13 22:24:24'),
(12, 'motion', '2017-09-13 23:45:17'),
(13, 'motion', '2017-09-13 23:45:36'),
(14, 'motion', '2017-09-13 23:45:54'),
(15, 'motion', '2017-09-14 00:07:09'),
(16, 'motion', '2017-09-14 00:07:24'),
(17, 'motion', '2017-09-14 00:07:42'),
(18, 'motion', '2017-09-19 09:42:11'),
(19, 'motion', '2017-09-19 09:42:27'),
(20, 'motion', '2017-09-19 09:42:44'),
(21, 'motion', '2017-09-19 11:21:08'),
(22, 'motion', '2017-09-19 11:21:23'),
(23, 'motion', '2017-09-19 11:21:38'),
(24, 'motion', '2017-09-19 11:21:54'),
(25, 'motion', '2017-09-19 11:48:13'),
(26, 'motion', '2017-09-13 16:20:41'),
(27, 'motion', '2017-09-13 16:20:57'),
(28, 'motion', '2017-09-13 16:21:24'),
(29, 'motion', '2017-09-13 16:21:40'),
(30, 'motion', '2017-09-13 16:26:38'),
(31, 'motion', '2017-09-13 17:09:00'),
(32, 'motion', '2017-09-13 17:09:16'),
(33, 'motion', '2017-09-13 22:14:37'),
(34, 'motion', '2017-09-13 22:23:53'),
(35, 'motion', '2017-09-13 22:24:08'),
(36, 'motion', '2017-09-13 22:24:24'),
(37, 'motion', '2017-09-13 23:45:17'),
(38, 'motion', '2017-09-13 23:45:36'),
(39, 'motion', '2017-09-13 23:45:54'),
(40, 'motion', '2017-09-14 00:07:09'),
(41, 'motion', '2017-09-14 00:07:24'),
(42, 'motion', '2017-09-14 00:07:42'),
(43, 'motion', '2017-09-19 09:42:11'),
(44, 'motion', '2017-09-19 09:42:27'),
(45, 'motion', '2017-09-19 09:42:44'),
(46, 'motion', '2017-09-19 11:21:08'),
(47, 'motion', '2017-09-19 11:21:23'),
(48, 'motion', '2017-09-19 11:21:38'),
(49, 'motion', '2017-09-19 11:21:54'),
(50, 'motion', '2017-09-19 11:48:13');

我必须使用 CONVERT_TZ (mysql conversion function )

使用时间转换进行两个查询

我需要两个查询： 1. 获取日期 "today" 和 "today - 30 days back" 之间的记录 2. 获取给定日期的记录，如“2017-09-14”

我试过以下查询

日期之间的记录：

SELECT * FROM test.records WHERE name LIKE '%motion%' 
AND CONVERT_TZ(time_created ,'+00:00','-7:0') BETWEEN DATE_SUB(CONVERT_TZ('2017-09-20 11:48:13' ,'+00:00','-7:0'), INTERVAL 30 DAY) AND CONVERT_TZ('2017-09-20 11:48:13','+00:00','-7:0') 
GROUP BY DATE(time_created) ORDER BY ID DESC;

result : 
18  motion  2017-09-19 09:42:11
15  motion  2017-09-14 00:07:09
1   motion  2017-09-13 16:20:41

给定日期的记录：

SELECT name,id, CONVERT_TZ(time_created ,'+00:00','-7:0') as time_created,
DATE_FORMAT( CONVERT_TZ(time_created ,'+00:00','-7:0') , '%h:%i:%s %p') as new_format_time 
FROM test.records WHERE name LIKE '%motion%' 
AND DATE( CONVERT_TZ(time_created ,'+00:00','-7:0') ) = '2017-09-14' ORDER BY ID DESC
result:
0 records

Answer 1

首先，假设您的系统是运行 UTC

   SELECT * FROM test.records
   WHERE name LIKE '%motion%' AND
      time_created >= DATE_SUB(CONVERT_TZ(NOW(),'+00:00','-7:0') , INTERVAL 30 DAY)
   GROUP BY DATE(time_created) ORDER BY ID DESC;

如果NOW()是当前时区

   SELECT * FROM test.records
   WHERE name LIKE '%motion%' AND
      CONVERT_TZ(time_created,'+00:00','-7:0') >= DATE_SUB(NOW(), INTERVAL 30 DAY)
   GROUP BY DATE(time_created) ORDER BY ID DESC;

--- 编辑 201/09/25 ---

其次，知道要与哪个时区进行比较非常重要。

select DATE(CONVERT_TZ('2017-09-14 00:07:25','+00:00', '-07:00'));

将日期放在前一天或2017-09-13（我们已将比较移到等式的另一边，因此我们必须更改顺序

将 >= 更改为 = 并仅使用 DATE()

   SELECT *
   FROM test.records
   WHERE name LIKE '%motion%' AND
     DATE(CONVERT_TZ(time_created,'-7:0', '+00:00')) = '2017-09-14'
   GROUP BY DATE(time_created) ORDER BY ID DESC;

最简单的比较是与 UTC 进行比较，公式为

   SELECT *
   FROM test.records
   WHERE name LIKE '%motion%' AND
     DATE(time_created) = '2017-09-14'
   GROUP BY DATE(time_created) ORDER BY ID DESC;

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