I have a datetime object from a sitemap in this format -
2014-12-29 05:00:38-05:00
How can I store this datetime in POSTGRES?
Use timestamp with time zone:
CREATE TABLE tab(col timestamp with time zone);
INSERT INTO tab
VALUES ('2014-12-29 05:00:38-05:00');
SELECT *
FROM tab;
SqlFiddleDemo
Related
I am trying to save datetime with timezone in Postgres but can not find anything usefull.
Input would be like,
2021-03-21T12:24:30Z
2021-03-21T12:24:30PST'
and i am expecting output in the datetime column like,
'2001-02-16 18:38:40+05:30'
'2001-02-16 18:38:40+00'
what would be the datatype in column and what's the way i can save the date time including timezone.
You should use the TIMESTAMPTZ data type for the column - https://www.postgresql.org/docs/9.5/datatype-datetime.html
When inserting now() in a table, the written value only contains the date (e.g. 2017-12-20), but not the date and time as specified in the documentation.
See this SQLfiddle.
create table timetest (
id serial primary key,
mydate date
);
insert into timetest (mydate) values (
now());
Is there some specific command that should be passed to either write or retrieve also the time information?
You created mydate date as a date type column. date only represents the date fraction (unsurprisingly).
If you need both date and time use timestamp type instead.
References:
https://www.postgresql.org/docs/current/static/datatype-datetime.html
I need storage 2 colums with date_time in my postgresql DB table.
date_time date_time_human
676484556463346 09.06.2017 9:38:00
date_time - like oracle timestamp( this date in seconds)
date_time_human - date in normal form
What type of field should be?
INSERT INTO tabl (date_time, date_time_human) VALUES(now(), now())
It seems to me that if you have the same value in these fields, then there is no sense in starting it twice.
Create one field of type timestamp. And in seconds you can output and record using functions.
Data Type Formatting Functions
Image I have a table containing the following two columns:
timestampwithouttimezone (of type TIMESTAMP WITHOUT TIME ZONE)
utcoffset (of type INTEGER)
I want to convert those two column to a single one of type TIMESTAMP WITH TIME ZONE. Can this be achieved using a ALTER TABLE ALTER COLUMN [column] SET DATE TYPE TIMESTAMP WITH TIME ZONE query and the additional USING clause?
Or do I need a separate UPDATE query that takes the offset and sets the timezone of the timestamps? If that's the case, what would that query be? I can't find any examples that show how to update the timezone using an integer.
You could do that like this, assuming the offset is in hours:
ALTER TABLE mytab
ALTER timestampwithouttimezone
TYPE timestamp with time zone
USING CAST (timestampwithouttimezone::text || ' '
|| to_char(utcoffset, 'S00FM')
AS timestamp with time zone),
DROP utcoffset;
I'm trying to format the timestamps in my Postgres database to a certain format:
YYYY-MM-DD HH24:MI:SS
By doing:
update myTable set tds = to_char(tds, 'YYYY-MM-DD HH24:MI:SS')::timestamp;
I managed to set all the previously stored tds to this format. However, any newly added entry goes back to: YYYY-MM-DD HH24:MI:SS.MS since the default is set to now().
How do I change this so that newly added entries also have the format: YYYY-MM-DD HH24:MI:SS?
There is no format stored in a timestamp type. You can set its default to a timestamp truncated to the second at creation time
create table t (
tds timestamp default date_trunc('second', now())
)
Or alter the table
alter table t
alter column tds
set default date_trunc('second', now());
insert into t values (default);
INSERT 0 1
select * from t;
tds
---------------------
2014-03-11 19:24:11
If you just don't want to show the milliseconds part format the output
select to_char(now(), 'YYYY-MM-DD HH24:MI:SS');
to_char
---------------------
2014-03-11 19:39:40
The types timestamp or timestamptz optionally take a precision modifier p: timestamp(p).
To round to full seconds, set the default to:
now()::timestamp(0)
or:
now()::timestamptz(0)
Standard SQL functions CURRENT_TIMESTAMP (returns timestamptz) or LOCALTIMESTAMP (returns timestamp) allow the same precision modifier:
CURRENT_TIMESTAMP(0)
LOCALTIMESTAMP(0)
That's a bit shorter than calling date_trunc() - which truncates fractional seconds (may be what you really want!)
date_trunc('second', now())
Store timestamps as timestamptz (or timestamp), not as character type.
Finally, to make sure that ...
newly added entries also have the format: YYYY-MM-DD HH24:MI:SS
you could define your column as type timestamptz(0). This covers all values entered into that column, not just the default. But the rounding may introduce timestamps up to half a second in the future. If that can be an issue in any way, rather use date_trunc().
See #Clodoaldo's answer for instructions on to_char() and how to ALTER TABLE.
This related answer for in-depth information on timestamps and time zone handling:
Ignoring time zones altogether in Rails and PostgreSQL