In one of my Mysql database table the dates are stored in the format 31-Jan-05.
I'm trying to convert this format to 2005-01-31 before inserting them in other tables.
I've tried in this way str_to_date(exam_date, '%d%M%Y'), but i encounter the following error
Incorrect datetime value: '31-Jan-05' for function str_to_time
Can't i change the date format from 31-Jan-05 to 2005-01-31 using str_to_date?
Thanks in advance.
Yes. But you have two problems.
The second parameter is the current date format. (i.e. of the string)
You need to have the proper format (i.e. %b instead of %M).
Read the docs the for str_to_date().
str_to_date(exam_date, '%d-%b-%y')
Note: If you don't have a zero padded day, then you need to use %e instead of %d.
Related
I have a dateformat but to display on front end I would like to display the data like so.
SELECT STR_TO_DATE('5,2013','%m,%Y');
The result I would like to generate is 'May 2013'.
Why are you storing dates as string values? Mysql has dedicated data types for date and time values: https://dev.mysql.com/doc/refman/5.7/en/date-and-time-types.html
When using date, you can easily use DATE_FORMAT and set %m,%Y as formatting (second argument).
SELECT replace(date_format(str_to_date('5,2013','%m,%Y'),'%M-%Y'),'-',' ');
As to the format just read the docs: https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_date-format. You need an uppercase M for the month name. And use DATE_FORMAT to get from a date to a string.
SELECT DATE_FORMAT(DATE '2013-05-01', '%M %Y');
Assuming that you have 5,2013 stored in your database, you need to use DATE_FORMAT after parsing the string:
SELECT DATE_FORMAT(STR_TO_DATE('5,2013','%m,%Y'), '%b %Y')
Why? Because it seems you don't have a date type stored in the database. So you parse it to date using STR_TO_DATE. This give you the default date format. DATE_FORMAT let you apply other formattings on it.
All avaliable formatting values are documented here: https://www.w3schools.com/sql/func_mysql_str_to_date.asp
In general, I would recommend to think about storing date objects instead of custom date strings like 5,2013. This avoids those castings, because you could directly use DATE_FORMAT. It also has benefits on filtering/ordering and performance. Using date types, you could easily sort by it or filter e.g. everything in month X.
I don't say its not possible with custom strings like 5,2013 but would be more complex and could result in bad performance if the db grows.
You can use the functions:
str_to_date() to convert the string (after concatenating the prefix '1' to your string) to a valid date and then
date_format() to reformat the date:
SELECT date_format(str_to_date(concat('1,', ?),'%d,%m,%Y'), '%b %Y');
Replace ? with your string.
See the demo.
Result:
May 2013
I have written the following query:
INSERT INTO programs
(programId,programName,startDate,annualGoal)
VALUES
(135,'Community Evergreening',STR_TO_DATE('10-Mar-2013','dd-mmm-yyyy'),25000);
But, it says "Error Code: 1411. Incorrect datetime value: '10-Mar-2013' for function str_to_date".
I am not able to understand what I am doing wrong here.
You'll need to represent the date format like this: %d-%b-$Y
STR_TO_DATE('10-Mar-2013', '%d-%b-%Y')
The problem is that you are using the format dd-mmm-yyyy. However, MySQL's date formatting does not use that format.
If you look at the documentation for str_to_date, it says that it is the inverse of date_format, and that you can look at the documentation for date_format for a table of the characters that you can use to represent a date format.
For the specifiers that can be used in format, see the DATE_FORMAT() function description.
Try STR_TO_DATE('10-Mar-2013', '%d %b %Y')
Got from here
Hi I'm writing queries for MySQL, and now my database has a column containing the timestamp in this format: 7/14/2015 7:57:49 AM, but I need to use the DATEDIFF function, so how can I convert the timestamp into the format like: 2015-7-14 (or 2015-07-14, I'm not sure which one is correct; just the date)?
This should convert your string to just the date in a date format, then you can use DATEDIFF on the date fields in question:
SELECT STR_TO_DATE(LEFT(t,LOCATE(' ',t) - 1), '%m/%d/%Y') FROM my_table;
The LEFT function will take the substring to the left of the space, which is just your date, then STR_TO_DATE will convert that substring to a date the system can use.
(Not knowing your field and table names, I used t and my_table.)
You don't need to. The way MySQL displays timestamps has nothing to do with the way they're stored internally; as long as it's TYPE TIMESTAMP or some compatible type, the DATEDIFF() function will know what to do with it.
TIMESTAMPs are actually stored as a really huge integer representing (I think) milliseconds from Midnight UTC, January 1st, 1970. The display format is determined by a system global variable, and has nothing to do with the actual value.
Converting from a string to a DATETIME or TIMESTAMP is actually also fairly straightforward using the STR_TO_DATE() function; in your case the format string would be something like
STR_TO_DATE('%c/%e/%Y %l:%i:%s %p', datecol)
although you might have to experiment a bit to make it work reliably.
I got in my table two types:
hour_Event in type date
date_Event in type datetime
I would like hour_Event to be formatted to hh:mm
and date_Event to be dd/mm/yyyy
I use PHPMyAdmin and im new with MySQL so I dont know how to change the format and for what.
How do I do it?
**DATE_FORMAT(hour_Event,'%h:%i')** will give you hour_Event in hh:mm
and
**DATE_FORMAT(date_Event,'%d/%m/%Y')** will give you date_Event in dd/mm/yyyy
You could change the format using php before you insert data or after retrieving themfrom your database according to your needs.You could use DateTime / strtotime() & date(). In most cases a single timestamp field in your table is enough for an event.
Have a look here:
Convert one date format into another in PHP
Also you could format your field according to your needs with mysql for example:
DATE_FORMAT(tables.field, '%d-%m-%Y %H:%i:%s') AS 'new_name'
Have a look about it here:
http://dev.mysql.com/doc/refman/5.0/en/date-and-time-functions.html#function_date-format
Following is my sql query kindly let me know why is it returning null
Select STR_TO_DATE ('11-APR-74','%e%b%Y')
OR
Select DATE_FORMAT ('11-APR-74','%e%b%Y')
From MySQL STR_TO_DATE function:
The server scans str attempting to match format to it. ... Scanning
starts at the beginning of str and fails if format is found not to
match.
This is why your first query fails: 11-APR-74 does not look like %e%b%Y, so date cannot be parsed. You should do instead
SELECT STR_TO_DATE ('11-APR-74','%e-%b-%Y')
From MySQL Date and Time types:
Although MySQL tries to interpret values in several formats, date
parts must always be given in year-month-day order (for example,
'98-09-04'), rather than in the month-day-year or day-month-year
orders commonly used elsewhere (for example, '09-04-98', '04-09-98').
This is why your second query fails: 74 is not a valid day of month, you should do instead
SELECT DATE_FORMAT ('74-APR-11','%e%b%Y')
Note, that DATE_FORMAT is usually used on DB values, not string literals as you do - to get an output different from the default one.
If you want to convert from string to date
Select STR_TO_DATE ('11-APR-74','%d-%b-%y')
use it like ::
Select STR_TO_DATE ('11-APR-74','%e-%b-%Y')
Because '%e%b%Y' format does not correspond to '11-APR-74' string value (as STR_TO_DATE function expects), and because '11-APR-74' value is of type CHAR, but not DATETIME (as DATE_FORMAT function expects).
If you want to reformat a date represented by a CHAR value, convert it from its original format to DATETIME first, and then convert it to a string of desired format:
SELECT DATE_FORMAT(STR_TO_DATE('11-APR-74','%e-%b-%Y'),'%e%b%Y');
By the way, you could strip dashes with a plain string sunction:
SELECT REPLACE('11-APR-74','-','');