I see timestamp variable in api getting converted to 2 hours ahead and stored what time zone it is?
I want to know what timezone configuration is set to store how to set it for cet time
I will try to explain you how i do it for PsotgreSQL Here is an example that should help. If you have a timestamp with a timezone, you can convert that timestamp into any other timezone. If you haven't got a base timezone it won't be converted correctly.
SELECT now(),
now()::timestamp,
now() AT TIME ZONE 'CST',
now()::timestamp AT TIME ZONE 'CST'
Output:
-[ RECORD 1 ]---------------------------
now | 2018-09-15 17:01:36.399357+03
now | 2018-09-15 17:01:36.399357
timezone | 2018-09-15 08:01:36.399357
timezone | 2018-09-16 02:01:36.399357+03
Related
as said in the title I would like to have a query that returns the value of the time stamp in my current time zone (even according summer time!).
my_table is:
|timestamp|name|value|property1|property2|
|---|---|---|---|---|
|2021-08-01 00:00:00+00|10|0.44|0|0|
|2021-08-01 00:05:00+00|15|0.76|0|0|
|2021-08-01 00:10:00+00|12|0.28|0|0|
(Don't ask me why I cannot put this table directly in markdown...prob cause the dates)
Now for example if I have to select the 24h corresponding to the entire day in my time zone at the moment my solution is:
SELECT timestamp AT TIME ZONE 'CEST',name,value
FROM my_table
WHERE name IN (10,11,12)
AND timestamp BETWEEN '2021-08-01 00:00:00+02' AND '2021-08-02 00:00:00+02'
ORDER BY timestamp DESC
As you can see there is a problems here:
I have to specify every time if I is CEST or CET (now is CEST here)
and then I have to add +02 at the end of the dates (or +01 in CET)
There is a way to avoid this conceptual repetition?? any suggestion even to improve the query is appreciated
the command SELECT version(); gives me back PostgreSQL 12.7
Set your session's timezone appropriately.
set timezone TO 'Europe/Berlin';
select '2021-08-01 00:00:00+00'::timestamptz;
timestamptz
------------------------
2021-08-01 02:00:00+02
select '2021-12-01 00:00:00+00'::timestamptz;
timestamptz
------------------------
2021-12-01 01:00:00+01
select '2021-08-01 00:00:00'::timestamptz;
timestamptz
------------------------
2021-08-01 00:00:00+02
What is your session timezone set to now?
I am trying to convert from UTC time zone to GMT time zone.
I ran this below query and getting ORA error.
select NEW_TIME(SYSDATE, 'UTC', 'GMT') from dual;
And error is
Error starting at line : 1 in command -
select NEW_TIME(SYSDATE, 'UTC', 'GMT') from dual
Error report -
ORA-01857: not a valid time zone
I googled and find that NEW_TIME function is not accepting UTC time zone.
So, Can you please suggest me alternate solution/any way to convert from UTC to GMT?
UTC is also known as GMT, the latter which NEW_TIME already accepts. So, what you are trying to is equivalent to:
SELECT NEW_TIME(SYSDATE, 'GMT', 'GMT')
FROM dual;
The call to NEW_TIME doesn't make any sense of course. Check here for a list of accepted timezone codes.
Use FROM_TZ from convert a timestamp without a time zone to a timestamp with time zone (i.e. UTC) and then use AT TIME ZONE 'GMT' to convert it from the first time zone to the GMT time zone. You'll need to use CAST in various places as FROM_TZ expects a TIMESTAMP rather than a DATE and then you need to cast back to a DATE at the end (assuming you don't want a TIMESTAMP value):
SELECT CAST(
FROM_TZ(
CAST( SYSDATE AS TIMESTAMP ),
'UTC'
)
AT TIME ZONE 'GMT'
AS DATE
) As gmt_time
FROM DUAL
Output:
| GMT_TIME |
| :------------------ |
| 2019-04-10T14:05:37 |
db<>fiddle here
I'm hurting my head again this :
On postgresql, I would like to get the local time for a given timezone.
So, at 15:45 GMT, I want 16:45 for +01:00, but I can't get the good anwser :
SQL Fiddle
Query 1:
select current_timestamp at time zone 'GMT' as time_local_gmt
Results:
| time_local_gmt |
|-----------------------------|
| 2018-01-26T15:45:10.871659Z |
This is OK.
Query 2:
select current_timestamp at time zone '+01:00' as time_local_paris
Results:
| time_local_paris |
|-----------------------------|
| 2018-01-26T14:45:10.871659Z |
This is totally wrong, seem like it's -01:00 instead of +01:00
Edit :
See the valid answer here : https://stackoverflow.com/a/48707297/5546267
This worked for me.
select current_timestamp at time zone 'UTC+1';
Gave me the following result.
2018-01-26T17:00:58.773039Z
There is also a list of timezone names.
Here is an excerpt from the PostgreSQL 9.6 documentation regarding timezone names.
The view pg_timezone_names provides a list of time zone names that are recognized by SET TIMEZONE, along with their associated abbreviations, UTC offsets, and daylight-savings status.
Basically, the following query will give you the current time in Paris.
SELECT current_timestamp AT TIME ZONE 'Europe/Paris';
Good Luck!
For completeness (even if #Avi Abrami's answer should be what you're searching for) let's take a look at the datetime operators in the docs.
One can use the INTERVAL keyword to add hours to the stored value:
SELECT current_timestamp AT TIME ZONE INTERVAL '+02:00' AS plus_two;
Which then results in
2018-01-26T17:45:10.871659Z
(when GMT time is 2018-01-26T15:45:10.871659Z)
Section 9.9.3 AT_TIME_ZONE mentions my use of INTERVAL without any preceeding operator:
In these expressions, the desired time zone zone can be specified either as a text string (e.g., 'PST') or as an interval (e.g., INTERVAL '-08:00'). In the text case, a time zone name can be specified in any of the ways described in Section 8.5.3.
The documentation says:
Another issue to keep in mind is that in POSIX time zone names, positive offsets are used for locations west of Greenwich. Everywhere else, PostgreSQL follows the ISO-8601 convention that positive timezone offsets are east of Greenwich.
I guess that is your problem.
Ok, finally found how to !
SELECT
current_timestamp
AT TIME ZONE 'GMT'
AT TIME ZONE '+01:00'
AS time_local_paris_right;
The timestamp is UTC without TZ by default, you force it as a GMT one, and then the second AT convert it with the right offset to give you the local time for the specified time zone.
SQL Fiddle
PostgreSQL 9.6 Schema Setup:
Query 2:
select current_timestamp at time zone 'GMT' as time_local_gmt
Results:
| time_local_gmt |
|-----------------------------|
| 2018-02-09T13:44:56.824107Z |
Query 3:
select current_timestamp at time zone '+01:00' as time_local_paris_wrong
Results:
| time_local_paris_wrong |
|-----------------------------|
| 2018-02-09T12:44:56.824107Z |
Query 4:
select current_timestamp at time zone 'GMT' at time zone '+01:00' as time_local_paris_right
Results:
| time_local_paris_right |
|-----------------------------|
| 2018-02-09T14:44:56.824107Z |
I could appreciate a second pair of eyes on my Postgres syntax.
Database stores timestamp in UTC. I'm trying to convert from UTC to Eastern Daylight Time EDT, but the output is not accurate.
Here's my syntax:
SELECT
to_char(((timestamp AT TIME ZONE 'UTC') AT TIME ZONE 'EDT'), 'MM/DD/YYYY HH24:MI')
FROM table_name
Record TimeStamp:
09/10/2016 12:00
Query Output:
09/10/2016 16:00
Desired Output:
09/10/2016 08:00
Thanks for your assistance.
Saying AT TIMEZONE twice is redundant since it will just convert from whatever the current timezone (which you suggest is UTC) to UTC then to EDT.
The fact that you feel the need to convert it to UTC tells me you're not storing it as a TIMESTAMP WITH TIMEZONE. Check if this is the case. If it is, that's likely your problem. From the docs:
If no time zone is stated in the input string, then it is assumed to be in the time zone indicated by the system's timezone parameter, and is converted to UTC using the offset for the timezone zone.
Basically, if you don't specify, it assumes it's from your current timezone by default, not UTC. It's possible you entered a UTC timestamp and it assumed it was EDT.
I use postgres for the rails app and I have a unix timestamp in postgresql db. I have a requirement to select and group by the dd-mm-yyyy and by month name.
Consider I have the following unix timestamp
1425148200
and I would need to change this to datetime and I used to_timestamp which returned
2015-02-28 18:30:00 UTC
and I tried to convert the datetime to local timezone using
::timestamp without time zone AT TIME ZONE 'IST'
but that did not give time in required timezone and instead it returned
2015-02-28 16:30:00 UTC
and I tried to get the date part using ::date which returned
Sat, 28 Feb 2015
So please help me get the dd-mm-yyyy in specified timezone and month name(March) from the unix timestamp.
Thanks in Advance!
select to_char(to_timestamp('1425148200')::timestamptz at time zone 'UTC-5:30','DD-MM-YYYY & of course Month')
01-03-2015 & of course March
It is postgres mistake I guess
according to http://www.postgresql.org/docs/7.2/static/timezones.html