I need to execute a INSERT statement writing a date with a YYYY-MM-DD format.
Would to_date('2021-09-28','YYYY-MM-DD') work?
YYYY-MM-DD is the the ISO 8601 standard date format and unambiguous default in Postgres. Just insert your date literally.
The type date is stored as a 4-byte integer quantity internally, which does not preserve any format. You can format any way you like on output with some basic locale settings or settings of your client, or explicitly with to_char().
Input with to_date('2021-09-28','YYYY-MM-DD') works, too. But you don't need to_date() while operating with ISO format.
Related
I've date in dd-mm-yyyy format, I need the date in yyyy-mm(month) format. I'm using postgresql.
Thanks in advance.
date values don't have any format. Any formatting you see is applied by your SQL client. To turn a date into a string with a specific format, you can use to_char()
to_char(the_column, 'yyyy-mm')
Coming out of an Oracle background converting dates from any format to any format is really easy.
How is this done in SQLite? I've searched and searched for answers and most of the answers simply say... Save your date/strings in SQLite in one single format which is YYYY-MM-DD HH:MM:SS.SSS. This seems rigid to me.
I don't have that luxury as my data is stored in this format DD/MM/YYYY HH:MI:SS am ex. 3/7/2020 8:02:31 AM.
NOTE: For single days/months my date values do not contain leading zeros and my time is NOT in military time.
How do I tell SQLite what my date format is so that I can correctly convert my stored dates to SQLite datetime formats?
Convert from SQLite Date Format to Oracle Date Example:
In Oracle I would simply use the to_date function like so
to_date('2019-03-07 15:39:34', 'YYYY-MM-DD HH24:MI:SS')
All one needs to do is to tell the function what the date format is... and then it spits out a date.... easy peasy. What this example does is convert a SQLite date formated string to a date that Oracle recognizes as a date. It doesn't matter what the format is in as I tell the function what format to expect.
How do I Convert Dates in SQLite from any format to the SQLite Format?
Converting from SQLite's date format string to ANY date is easy as there are functions built in that do this easily... but how to do this the other way round?
I need to change the date format from yyyy-mm-dd to dd/mm/yyyy, but I need to keep the date type for the column. So far, I have used this method that changes the format correctly but transforms the column type from date to text.
TO_CHAR(mydate::TIMESTAMP WITH TIME ZONE, 'dd/mm/yyyy'::TEXT) ;
How can I do it with keeping the date type?
This is a misunderstanding.
If your data type is date, then it is stored without format. It's just a 4-byte integer counting seconds since 2000.
You can format it any way when displaying to the client.
SELECT to_char(mydate, 'yyyy-mm-dd') AS one_way
,to_char(mydate, 'dd/mm/yyyy') AS other_way
'yyyy-mm-dd' happens to be ISO 8601 format, which is the default text representation in many locales.
You can always create a VIEW with a text representation of the date:
CREATE VIEW v_tbl_with_date_foramt AS
SELECT id, some_column, to_char(mydate, 'dd/mm/yyyy') AS mydate_text
FROM tbl;
But now it's a text column, not a date column.
datestyle is responsible for how input date literals are interpreted.
LC_TIME regulates how date/time functions behave.
Formatting Date(YY:MM:DD:Time) in Excel
The default display is the ISO 8601: 'yyyy-mm-dd'.
I am not knowing which datatype to be assigned to the data of format yyyy-mm-dd hh:mm:ss?
I use postgresql database.
You're looking for timestamp (with or without timezone, with timezone preferred to store the actual data)
See PostgreSQL's documentation on Date/Time Types
In postgres I have a table with date column. Now postgres allows me to write date in Y-m-d format. But I need date in d/m/Y format. How to change it?
When I do:
show datestyle;
I get:
"ISO, DMY"
And input date in table in this format 13/02/2009
But when I close and open table again I see this 2009-02-13. JDBC gives me date in this format too. What am I doing wrong?
you also can use the command
set datestyle to [your new datestyle];
in the console of postgreSQL.
yyyy-mm-dd is the recommended format for date field, its the ISO 8601 format.
You can change the format in the postgresql.conf file.
The document states
The date/time styles can be selected by the user using the SET
datestyle command, the DateStyle parameter in the postgresql.conf
configuration file, or the PGDATESTYLE environment variable on the
server or client. The formatting function to_char is
also available as a more flexible way to format date/time output.
Hope this helps!
Use the to_char function with your date as follows:
select to_char(date_column1, 'Mon/DD/YYYY');
If at all possible, don't use DATESTYLE. It'll affect all code in your session, including things like stored procedures that might not be expecting it and might not have set an explicit overriding DATESTYLE in their definitions.
If you can, use to_char for date output, and to_timestamp for date input whenever you need to use any date formats that might be ambiguous, like D/M/Y. Use ISO dates the rest of the time.