How to convert a timestamp into custom formated string with timezone in MySQL?
This is how I am selecting the timestamp right now. Its correctly formated, but lacks timezone. updated is the name of the timestamp field.
SELECT DATE_FORMAT(updated, '%e.%c.%Y %T') AS updated FROM table;
returns strings like this:
29.1.2015 12:43:16
Then I tried adding timezone like this, but I am getting NULLs as return values.
SELECT DATE_FORMAT(CONVERT_TZ(updated, 'GMT', 'Europe/Helsinki'), '%e.%c.%Y %T') AS updated FROM table;
i use 1383123123 instead timestamp field
Select FROM_UNIXTIME(1383123123);
the result is '2013-10-30 10:52:03'
Select CONVERT_TZ(FROM_UNIXTIME(1383123123), '+00:00', '+02:00')
the result is '2013-10-30 12:52:03'
'Europe/Helsinki' time zone means "gmt+2"
Related
I am getting a null result when trying to change the date format,
SELECT DATE_FORMAT("31-Mar-2022", '%d/%m/%Y');
What would be the right way of changing the format from 31-Mar-2022 to 2022-03-31 ?
dbfiddle
The route you want to take here in general is STR_TO_DATE to first convert the string date into a bona fide, followed by DATE_FORMAT, to convert the bona fide date back to a string in some other format. So the following will work:
SELECT DATE_FORMAT(STR_TO_DATE('31-Mar-2022', '%d-%b-%Y'), '%Y-%m-%d') AS output;
But note that the default rendering of a MySQL date often will be %Y-%m-%d, so in this case, you probably can avoid the outer call to DATE_FORMAT, and just use:
SELECT STR_TO_DATE('31-Mar-2022', '%d-%b-%Y') AS output;
In my table have two columns, one as timestamp to save the date and one as time string to save the time with period.
Eg:
I want to combine them into one column as DateTime format in the result then order by desc on that column.
Here is the example: http://sqlfiddle.com/#!9/25eb21/4
The column name 'Datetime' expected is Datetime or timestamps type, so I can sort correctly on it.
You do not need to convert the values to integers to add them. MySQL has built-in functions for this purpose:
SELECT *,
addtime(apptDate, str_to_date(apptTime, '%h:%i %p')) as datetime
FROM appt
ORDER BY Datetime DESC;
If apptTime is just a time value (which it should be), then you obviously do not need to convert from a string. I would usuggest fixing the data model.
Let me assume that you want to add the duration that is stored as a string in column apptTime to timestamp in column apptDate.
A typical approach uses str_to_date() to turn the string to a datetime, then converts the time portion to seconds using time_to_sec(), which we can then add to the timestamp using date artihmetics.
So
select t.*
apptdate
+ interval time_to_sec(str_to_date(appttime, '%h:%i %p')) second
as newapptdate
from mytable
select addtime(appDate, appTime) from ...
Your appDate contains a time, probably because you are applying a timezone. Either convert your two columns to the timezone your data is supposed to be in with convert_tz(), or extract the date part of it with date(appDate) before you add it. It wasn't clear which of the columns was a string, but extract() or str_to_date() is the way to parse a text into a date and/or time.
In mysql database,column name created.This "created " column is text datatype,I need to change this to datetime.Now this column have so many datas.Is it possible to convert it or?
Database look like
created
18-11-15 18:21:25
Expecting ouput is
created
2018-11-15 18:21:25
When am doing
ALTER TABLE invoices MODIFY created datetime
This query giving wrong data.its converting from 15-09-18 03:03:43 to 2015-09-18 03:03:43
If the original data is not in MySQL Datetime format (YYYY-MM-DD HH:MM:SS), you cannot just change the column datatype from Varchar/Text to Date/Datetime. Otherwise, there will be an irreparable Data loss.
This will be a multi-step process. You will first need to convert the date string to MySQL date format (YYYY-MM-DD HH:MM:SS). We can use STR_TO_DATE() function for this.
Your sample date string (18-11-15 18:21:25) is basically in %y-%m-%d %T format. Following format specifiers can be used:
%d Day of the month as a numeric value (01 to 31)
%m Month name as a numeric value (00 to 12)
%y Year as a numeric, 2-digit value
%T Time in 24 hour format (hh:mm:ss)
The query to update the date would look as follows:
UPDATE invoices
SET created = STR_TO_DATE(created, '%y-%m-%d %T');
Now, you can use Alter Table to change the data type from Text type to Datetime.
ALTER TABLE invoices
MODIFY COLUMN created datetime;
The best thing to do here is to not store your dates as text. Assuming you have already done this, we can cope by calling STR_TO_DATE to generate a bona fide date:
SELECT
STR_TO_DATE(created, '%y-%m-%d %h:%i:%s') AS created_out
FROM yourTable;
Since the output you expect is standard date output, we can stop here and avoid also calling DATE_FORMAT to generate a different output.
you want to convert output or database records ? for second you can use sql query :
UPDATE 'table_name' SET 'created' = CONCAT('20', 'created')
You will need first to interchange the day with the year in the created column, as follows:
UPDATE invoices
SET created = CONCAT(SUBSTR(created, 7, 2), '-', SUBSTR(created, 4, 2), '-', SUBSTR(created, 1, 2));
Then, you convert the column to DATETIME, as follows:
ALTER TABLE invoices MODIFY created DATETIME;
Hope this helps.
I am trying to convert dates in the format mm/dd/yyyy to the standard date format yyyy-mm-dd using the STR_TO_DATE function. Some fields in my date column are null and some contain a date.
For instance, 8/22/2011 should become 2011-8-22.
When I select my date column, it looks like this:
8/22/2011
8/10/2010
5/12/2012
etc.
I tried using the code
UPDATE table SET date = STR_TO_DATE(date, '%m/%d/%Y')
which filled the column with NULL values. Also tried
UPDATE table SET date = STR_TO_DATE(#date, '%m/%d/%Y')
with same result, although this time I did not get a warning message.
The first one is correct:
UPDATE table SET date = STR_TO_DATE(date, '%m/%d/%Y')
But if the date is not valid (not in %m/%d/%Y format) then it returns NULL
Try executing and then showing warnings. It tells you what is wrong:
UPDATE table SET date = STR_TO_DATE(date, '%m/%d/%Y');
SHOW WARNINGS;
Maybe some dates are not in format %m/%d/%Y (posibly %d/%m/%Y)
select DATE_FORMAT('8:48:30 AM', '%H:%i:%s')
It returns Null why ?
but when using
select DATE_FORMAT(CURTIME(), '%H:%i:%s')
It return formatted value.
It's returning NULL because MySQL isn't successfully parsing the string into a valid DATETIME value.
To fix the problem, use the STR_TO_DATE function to parse the string into a TIME value,
SELECT STR_TO_DATE('8:48:30 AM', '%h:%i:%s %p')
Then, to get the TIME value converted to a string in a particular format, use the TIME_FORMAT function, e.g. 24-hour clock representation:
SELECT TIME_FORMAT(STR_TO_DATE( '8:48:30 AM', '%h:%i:%s %p'),'%H:%i:%s')
returns:
--------
08:48:30
The method DATE_FORMAT is used to display date and time, however in the first you are not assigning any date except time, so its is throwing null.
From the manuals -
DATE_FORMAT Formats the date value according to the format string.
In MySql version 5.5 SELECT DATE_FORMAT( CURTIME( ) , '%H:%i:%s' ) returns null
DATE_FORMAT 's first parameter is of type DATETIME. On recent mysql server versions both your queries return NULL.
So the answer to your question is that this difference in behaviour is because of a bug in your mysql version - in some way it converts the TIME to DATETIME, while it cannot convert the string to DATETIME.
Here is also an example of a working query:
select DATE_FORMAT(NOW(), '%H:%i:%s')
NOW() returns a DATETIME while CURTIME() returns TIME.
To my knowledge, I think it's because MySQL recognises the function as a time, and therefore knows how to handle it. Whereas, in the first example, it regards it as a string and doesn't know what to do with it.