MySQL timestamp format conversion date format string

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1. Test table structure

CREATE TABLE `timestamp_string_change` (
  `id` int NOT NULL AUTO_INCREMENT,
  `up_time` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

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2. mysql Timestamp format to string

Method 1 ：

select STR_TO_DATE(tsc.up_time, '%Y-%m-%d %H:%i:%s' ) as up_time from timestamp_string_change tsc 

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Method 2：

select from_unixtime(unix_timestamp(up_time), '%Y-%m-%d %H:%i:%s' ) as up_time from timestamp_string_change 

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notes ： Method 2 when , We need to use it first. unix_timestamp() Method to convert data to timestamp format , Reuse from_unixtime() Method to convert a timestamp to a custom format time string . Direct use from_unixtime() Method NULL.

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