So in my database i have a table with startimestamp that is "Timestamp with time zone" type
but what i want to display the timestamp without the time zone so i thought this would work
Select to_char("StartTimestamp",'YYYY/MM/DD HH24:MM:SS')from "Samples" where "ID" = 20
and a i get
"2013/08/02 14:08:04"
but the when i do it without the to_char and just call the timestamp for the same id like this
select "StartTimestamp" from "Samples" where "ID"=20
i get this which is the correct one
"2013-08-02 14:31:04-07"
I'm i missing something the to_char statement? Thanks
Change MM to MI in the minutes place
select
to_char(now(),'YYYY/MM/DD HH24:MM:SS'),
to_char(now(),'YYYY/MM/DD HH24:MI:SS');
to_char | to_char
---------------------+---------------------
2013/08/21 15:08:00 | 2013/08/21 15:51:00
Related
I am currently working with raw data that have timestamps in GMT and I want to convert them to CST. I am trying to use the cast function to change the timestamp, but it is not working- the times are not affected. Most of what I have read about timezones in postgresql assumes that the default timezone is UTC so I'm not sure if there is a different syntax needed for when the data I'm trying to convert is GMT. Any help is greatly appreciated!
WITH RECURSIVE "child" AS (
SELECT "ConsultantDisplayID",
"JoinDate",
"ParentPersonDisplayID"
FROM "public"."flight_export_consultant"
WHERE "ConsultantDisplayID" = '4019'
UNION
SELECT c."ConsultantDisplayID",
CAST(c."JoinDate" at time zone 'america/chicago' as timestamp) as "JoinDate"
c."ParentPersonDisplayID"
FROM "public"."flight_export_consultant" AS c
JOIN "child" AS cd
ON c."ParentPersonDisplayID" = cd."ConsultantDisplayID"),
"sponsor" AS (
SELECT
"child".*,
c1."ConsultantDisplayID",
Cast(c."JoinDate" at time zone 'america/chicago' as timestamp) as "Sponsor JoinDate"
FROM "public"."flight_export_consultant" AS c1
LEFT JOIN "child"
ON c1."ConsultantDisplayID" = "child"."ParentPersonDisplayID")
SELECT * FROM "sponsor"
As #Mike Organek pointed out a field of type timestamp assumes local time on entry. So first thing you need to establish is where the dates are being entered from and whether they are are actually being entered as GMT. For the moment assuming they are you could do the following:
select 'September 24, 2018, 4:01PM'::timestamp at time zone 'utc' at time zone 'america/chicago';
timezone
---------------------
09/24/2018 11:01:00
-- Or if you want to stick to GMT
select 'September 24, 2018, 4:01PM'::timestamp at time zone 'gmt' at time zone 'america/chicago';
timezone
---------------------
09/24/2018 11:01:00
Basically you are 'anchoring' the timestamp at UTC/GMT and then converting to 'america/chicago'. In other words replicating what a timestamptz field does.
Given that JoinDate is type timestamp, this should be a good workaround for your situation now that we have established that the values in JoinDate of type timestamp represent UTC/GMT timestamps, and your server is not in UTC/GMT. The ideal solution is to use timestamptz columns.
The trick here is to cast JoinDate to text, append a z to it to make it UTC, and then cast it to timestamptz. Once that is done, you can use at time zone 'us/chicago' to do the conversion for you.
WITH RECURSIVE "child" AS (
SELECT "ConsultantDisplayID",
"JoinDate",
"ParentPersonDisplayID"
FROM "public"."flight_export_consultant"
WHERE "ConsultantDisplayID" = '4019'
UNION
SELECT c."ConsultantDisplayID",
"JoinDate",
c."ParentPersonDisplayID"
FROM "public"."flight_export_consultant" AS c
JOIN "child" AS cd
ON c."ParentPersonDisplayID" = cd."ConsultantDisplayID"),
"sponsor" AS (
SELECT
"child".*,
c1."ConsultantDisplayID",
c."JoinDate" as "Sponsor JoinDate"
FROM "public"."flight_export_consultant" AS c1
LEFT JOIN "child"
ON c1."ConsultantDisplayID" = "child"."ParentPersonDisplayID")
SELECT "ConsultantDisplayID",
("JoinDate"::text||'z')::timestamptz at 'america/chicago' as "JoinDate",
"ParentPersonDisplayID",
"ConsultantDisplayID",
("JoinDate"::text||'z')::timestamptz at 'america/chicago' as "Sponsor JoinDate"
FROM "sponsor";
In the view I have a text column which contains a timestamp in this format '20/03/2018 00:00' and I'm trying to make a selection with a between clause but it's not working
SELECT id,entry_date
FROM v_view
WHERE entrada BETWEEN to_timestamp('20/03/2018 00:00','DD/MM/YYYY')::timestamp and to_timestamp('22/03/2018 00:00')::timestamp
order entry_date
with this error message
ERROR: el operador no existe: text >= timestamp without time zone
LINE 3: WHERE entry_date BETWEEN to_timestamp('20/03/2018 00:00','DD/MM.
you need to convert the entrada column value to a timestamp.
Also: casting the result of to_timestamp() to a timestamp is useless because to_timestamp() already returns a timestamp
SELECT id,entry_date
FROM v_view
WHERE to_timestamp(entrada, 'dd/mm/yyyy hh24:mi')
BETWEEN to_timestamp('20/03/2018', 'DD/MM/YYYY')
and to_timestamp('22/03/2018', 'dd/mm/yyyy')
order entry_date;
I prefer to use ANSI SQL timestamp literals over the to_timestamp function:
SELECT id,entry_date
FROM v_view
WHERE to_timestamp(entrada, 'dd/mm/yyyy hh24:mi')
BETWEEN timestamp '2018-03-20 00:00:00'
and timestamp '2018-03-22 00:00:00'
order entry_date
Do not store date, time or timestamp values in a text or varchar column. You should define that column as timestamp then you don't need to convert anything and you don't need to deal with invalid timestamp values in that column.
The table schema is like this:
Column | Type | Modifiers
--------+--------------------------+--------------------------------------------------
time | timestamp with time zone | default now()
The time format is like this:
time
------------------------
2016-07-11 18:58:28+00
2016-07-11 18:58:37+00
2016-07-12 00:59:31+00
How to group by date with time truncated?
I would like to see the result as:
date
------------------------
2016-07-11
2016-07-11
2016-07-12
If you want compare or group by dates instead of timestamps you can cast to DATE:
SELECT time::DATE, ... FROM ... GROUP BY time::DATE;
or simpler
SELECT time::DATE, ... FROM ... GROUP BY 1;
Take a look at the current Postgresql documentation for datetime functions: https://www.postgresql.org/docs/current/static/functions-datetime.html
You can use date_trunc, extract, to_char or the simplest way is to cast to date (as I would do):
SELECT time::date; // 2016-07-11 18:58:28+00 -> 2016-07-11
Cheers!
use date_trunc:
select date_trunc('day', time)
I am trying to retrieve time difference in minutes from a table(login_history as t1) using postgresql .
When i tried this code
((date_part('hour', timestamp '2014-04-25 09:44:21')- date_part('hour', timestamp '2014-04-25 08:32:21'))*60 +(date_part('minutes', timestamp '2014-04-25 09:44:21')- date_part('minutes', timestamp '2014-04-25 08:32:21'))) as TimeNew
It works fine.
But when i tried to retrieve information from a table t1 using this code
((date_part('hour', timestamp t1.login_date)- date_part('hour', timestamp t1.logout_date))*60 +
(date_part('minutes', timestamp t1.login_date)- date_part('minutes', timestamp t1.logout_date))
) as TimeNew
It throws this error
SQLSTATE[42601]: Syntax error: 7 ERROR: syntax error at or near "t1"
Thanks
I would use the interval that results from subtracting two timestamps for a much simpler expression:
select extract (epoch from (timestamp '2014-04-25 09:44:21' - timestamp '2014-04-25 08:32:21'))::integer/60
(gives 72)
or for your table:
select extract (epoch from (t1.logout_date - t1.login_date))::integer/60
If you need to cast:
select extract (epoch from (t1.logout_date::timestamp - t1.login_date::timestamp))::integer/60
or see the to_timestamp function for custom string parsing: http://www.postgresql.org/docs/9.4/static/functions-formatting.html
I needed to remove the timestamp from the query before t1 and the query works.
My first query is:
SELECT distinct wfc_request_job_id,wfc_request_job_info,
replace(iso_cc,';',' ') as "iso_cc",to_char(wfc_request_start_ts,'yyyy-MM-dd HH:mm:ss') as ts,
sent_message_count,
(link_object_count + poi_object_count + point_address_object_count) as request_object_count
FROM wfc_request_job
where
wfc_request_job_id=173526;
This returns ts as 2015-08-16 03:08:59
Second Query:
SELECT wfc_request_job_id,wfc_request_start_ts,wfc_request_end_ts,replace(iso_cc,';',' ') as "iso_ccs",sent_message_count,wfc_queue_name
FROM wfc_request_job
where
to_char(wfc_request_start_ts,'YYYY-MM-DD') >= to_char(to_date('08/16/2015','MM/DD/YYYY'),'YYYY-MM-DD')
and to_char(wfc_request_start_ts,'YYYY-MM-DD') <= to_char(to_date('08/16/2015','MM/DD/YYYY'),'YYYY-MM-DD')
order by wfc_request_job_id desc
This returns ts of the job id mentioned above as - "2015-08-16 15:58:59.809+02"
How can I make both the queries return ts in UTC+02 - i.e. same timezone
The data type of wfc_request_start_ts is - timestamp with timezone
I changed to queries to have the format HH24:MI:SS however that did not help. Please note that the webapp using these queries will be opened in both Germany and USA.
According to postgresql manual to_char there is TZ (and OF as of v9.4) template patterns for Date/Time formatting.
Therefore in query you need to add it so
postgres=# select to_char(now(),'yyyy-MM-dd HH24:mm:ss TZ');
to_char
------------------------
2015-08-19 12:08:56 CEST
(1 row)
Also, make sure you specify timezone when converting
so instead
to_date('08/16/2015','MM/DD/YYYY')
use
TIMESTAMP WITH TIME ZONE '2015-08-16 00:00:00+02';
in second query.