Comments on: MySQL Update Query to Convert Date Formats MM/DD/YYYY to YYYY-MM-DD

By: robert

robert — Thu, 11 Oct 2007 21:41:57 +0000

Thanks to everyone who posed these queries, they were a lifesaver!!!!

By: Henny Savenije

Henny Savenije — Tue, 18 Sep 2007 06:01:53 +0000

Mark Dyer made this brilliant query and I adjusted it to work

UPDATE tng_people SET birthdatetr=
IF (LOWER(birthdate) regexp
‘(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec){3} [0-9]{4}$’AND
(birthdatetr = “0000-00-00″),
str_to_date(substring_index(birthdate,’ ‘,-3), ‘%e %b %Y’),
if (LOWER(birthdate) regexp
‘(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec){3} [0-9]{4}$’ AND
(birthdatetr = “0000-00-00″),
str_to_date(substring_index(birthdate,’ ‘,-2), ‘%b %Y’),
if(LOWER(birthdate regexp ‘[0-9]{1,2,3,4}$’ AND (birthdatetr = “0000-00-00″),
str_to_date(substring_index(birthdate,’ ‘,-1), ‘%Y’),
birthdatetr
)
)
);

By: William Keef

William Keef — Thu, 31 May 2007 20:48:13 +0000

Here is a MySQL query that will modify the single digit in DD of MM/DD/YYYY so it has a zero in front of it:

update tablename set datecolumname = replace (datecolumname,’/1/’,'/01/’)
WHERE datecolumname regexp ‘/[0-9]/’;
update tablename set datecolumname = replace (datecolumname,’/2/’,'/02/’)
WHERE datecolumname regexp ‘/[0-9]/’;
update tablename set datecolumname = replace (datecolumname,’/3/’,'/03/’)
WHERE datecolumname regexp ‘/[0-9]/’;
update tablename set datecolumname = replace (datecolumname,’/4/’,'/04/’)
WHERE datecolumname regexp ‘/[0-9]/’;
update tablename set datecolumname = replace (datecolumname,’/5/’,'/05/’)
WHERE datecolumname regexp ‘/[0-9]/’;
update tablename set datecolumname = replace (datecolumname,’/6/’,'/06/’)
WHERE datecolumname regexp ‘/[0-9]/’;
update tablename set datecolumname = replace (datecolumname,’/7/’,'/07/’)
WHERE datecolumname regexp ‘/[0-9]/’;
update tablename set datecolumname = replace (datecolumname,’/8/’,'/08/’)
WHERE datecolumname regexp ‘/[0-9]/’;
update tablename set datecolumname = replace (datecolumname,’/9/’,'/09/’)
WHERE datecolumname regexp ‘/[0-9]/’

This MySQL query will add a zero to the MM portion of MM/DD/YYYY :

update AK2KOrderDetails set ShipDateOD = CONCAT((REPLACE(”", “”,ShipDateOD)), “0″, ShipDateOD )
WHERE ShipDateOD NOT LIKE ‘10%’ AND ShipDateOD NOT LIKE ‘11%’ AND ShipDateOD NOT LIKE ‘12%’

Thanks for the conversion query you provided which does the rest. From a fellow pilot who spent my summers at my parents house on Eustis Ridge. Lots of relatives I have from the Srtatton area. Love Bigelow range.

By: Tim Flight

Tim Flight — Tue, 28 Feb 2006 19:08:02 +0000

No, it doesn’t. It also assumes the date is formatted with slashes.

In my case I already had leading zeroes for both the date and month sections of the field so I didn’t have to worry about it. It could certainly be done with PHP (or any other favorite scripting language) by finding where in the string the slash separators are, then parsing the values between to accommodate for months and dates with or without leading zeros. Then you could also add in the ability to deal with two or four digit years, etc.

By: michael salmons

michael salmons — Tue, 28 Feb 2006 18:57:58 +0000

This is nice but doesn’t take into account months that might only have one number and dates that might have two. Too bad, I’ve really been digging hard for a way to do this.