MySQL內置關於時間戳的計算和轉換函數介紹
TIMESTAMP函數
語法：
TIMESTAMP(datetime_expr)
TIMESTAMP(datetime_expr,expr)
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說明：
一個參數時，是將datetime_expr轉換成時間戳格式(timestamp)，兩個參數時，是將datetime_expr轉換成時間戳並加上expr
使用舉例：
mysql> select timestamp('2019-07-20 08:00:00');
+----------------------------------+
| timestamp('2019-07-20 08:00:00') |
+----------------------------------+
| 2019-07-20 08:00:00 |
+----------------------------------+
1 row in set
mysql> select timestamp('2019-07-20 08:00:00', '01');
+----------------------------------------+
| timestamp('2019-07-20 08:00:00', '01') |
+----------------------------------------+
| 2019-07-20 08:00:01 |
+----------------------------------------+
1 row in set
mysql> select timestamp('2019-07-20 08:00:00', '01:01');
+-------------------------------------------+
| timestamp('2019-07-20 08:00:00', '01:01') |
+-------------------------------------------+
| 2019-07-20 09:01:00 |
+-------------------------------------------+
1 row in set
mysql> select timestamp('2019-07-20 08:00:00', '01:01:01');
+----------------------------------------------+
| timestamp('2019-07-20 08:00:00', '01:01:01') |
+----------------------------------------------+
| 2019-07-20 09:01:01 |
+----------------------------------------------+
1 row in set
mysql> select timestamp('2019-07-20 08:00:00', '10 01:01:01');
+-------------------------------------------------+
| timestamp('2019-07-20 08:00:00', '10 01:01:01') |
+-------------------------------------------------+
| 2019-07-30 09:01:01 |
+-------------------------------------------------+
1 row in set
mysql> select timestamp('2019-07-20 08:00:00', '01 10');
+-------------------------------------------+
| timestamp('2019-07-20 08:00:00', '01 10') |
+-------------------------------------------+
| 2019-07-21 18:00:00 |
+-------------------------------------------+
1 row in set
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TIMESTAMPDIFF函數
語法：
TIMESTAMPDIFF(interval,datetime_expr1,datetime_expr2)
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說明：
返回日期或日期時間表達式datetime_expr1 和datetime_expr2 之間的整數差。其結果的單位由interval 參數給出。該參數必須是以下值的其中一個：
FRAC_SECOND 表示間隔是毫秒
SECOND 秒
MINUTE 分鍾
HOUR 小時
DAY 天
WEEK 星期
MONTH 月
QUARTER 季度
YEAR 年
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使用如下：
mysql> select TIMESTAMPDIFF(day,'2019-07-10','2019-07-20');
+----------------------------------------------+
| TIMESTAMPDIFF(day,'2019-07-10','2019-07-20') |
+----------------------------------------------+
| 10 |
+----------------------------------------------+
1 row in set
mysql> select TIMESTAMPDIFF(MINUTE,'2019-07-15 09:00:00','2019-07-20 19:00:00');
+-------------------------------------------------------------------+
| TIMESTAMPDIFF(MINUTE,'2019-07-15 09:00:00','2019-07-20 19:00:00') |
+-------------------------------------------------------------------+
| 7800 |
+-------------------------------------------------------------------+
1 row in set
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TIMESTAMPADD函數
語法：
TIMESTAMPADD(interval,int_expr,datetime_expr)
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說明：
將整型表達式int_expr添加到日期或日期時間表達式 datetime_expr中。式中的nterval和上文中列舉的取值是一樣的。
例如，int_expr為MINUTE時，是將datetime_expr時間增加int_expr分鍾。
mysql> select TIMESTAMPADD(MINUTE,60,'2019-07-20 21:00:00');
+-----------------------------------------------+
| TIMESTAMPADD(MINUTE,60,'2019-07-20 21:00:00') |
+-----------------------------------------------+
| 2019-07-20 22:00:00 |
+-----------------------------------------------+
1 row in set
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