Changing mysql date from an invalid date format

Question

I had date data in excel as dd-mm-yy H:i:s format, I mistakenly imported it to mysql where default format was %Y-%m-%d %H:%i:%s so all my date is wrong now, like 31-01-13 00:00:00 is became 2031-01-13 00:00:00 Now i can't import it again from excel so i need a mysql query to change the date within column.

Thanks Farness

Answer 1

Concatenating substrings from the date should work for all 2000s. For 1900s, you would need an if.

First verify the dates with a SELECT:

SELECT CONCAT(
 '20', 
 substr(date, 9, 2), 
 '-',
 substr(date, 6, 2),
 '-',
 substr(date, 3, 2),
 ' ',
 TIME(date)
)
FROM table

Then you can update the columns in place:

UPDATE table SET date=CONCAT(
 '20', 
 substr(date, 9, 2), 
 '-',
 substr(date, 6, 2),
 '-',
 substr(date, 3, 2),
 ' ',
 TIME(date)
)