Validate the datetime value

Validate the value should be year-month-day format e.g. 2026-05-06

MySQL approach

SELECT `my_date_column`, UNIX_TIMESTAMP(STR_TO_DATE(`my_date_column`, '%Y-%m-%d')) 
FROM `my_table`
WHERE
UNIX_TIMESTAMP(STR_TO_DATE(`my_date_column`, '%Y-%m-%d')) IS NULL;

Verify the value should be year/month/day format

SELECT `my_date_column`, UNIX_TIMESTAMP(STR_TO_DATE(`my_date_column`, '%Y/%m/%d')) 
FROM `my_table`
WHERE
UNIX_TIMESTAMP(STR_TO_DATE(`my_date_column`, '%Y/%m/%d')) IS NULL;

Verify the value should be hour:minute:second format e.g. 15:00:06

SELECT `my_time_column`, UNIX_TIMESTAMP(STR_TO_DATE(`my_time_column`, '%H:%i:%S')) 
FROM `my_table`
WHERE
UNIX_TIMESTAMP(STR_TO_DATE(`my_time_column`, '%H:%i:%S')) IS NULL;

Verify the value should be year-month-day hour:minute:second format e.g. 2026-05-06 15:00:06

SELECT `my_time_column`, UNIX_TIMESTAMP(STR_TO_DATE(`my_time_column`, '%Y-%m-%d %H:%i:%S')) 
FROM `my_table`
WHERE
UNIX_TIMESTAMP(STR_TO_DATE(`my_time_column`, '%Y-%m-%d %H:%i:%S')) IS NULL;

Alternative PHP solution: strtotime