My program receives timestamps in UTC, e.g. Tue, 31 May 2016 11:43:47 UTC. How do I convert them to a timestamp in the session's current timezone?
First convert the string to a timestamp with timezone (use the correct function). To show the result in your local (session) time zone, use the "AT LOCAL" clause.
select to_timestamp_tz('Tue, 31 May 2016 19:43:47 UTC',
'Dy, dd Mon yyyy hh24:mi:ss tzr') at local from dual;
Result (using my front-end settings for displaying timestamp with timezone - yours may be different):
31-MAY-16 02.43.47.000000000 PM AMERICA/CHICAGO
Use the tz_offset function to get the timezone offset for the session's timezone, then use the from_tz function to convert the string to a timestamp with time zone, and use at time zone to change it to use the session's timezone.
select from_tz(to_timestamp('Tue, 31 May 2016 11:43:47 UTC'
,'Dy, dd Mon yyyy hh24:mi:ss "UTC"')
, 'UTC')
at time zone tz_offset(sessiontimezone)
,sessiontimezone
from dual;
31/05/2016 19:43:47.000000000 +08:00 Australia/Perth
Related
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 am trying to convert the below string value to TO_DATE but oracle is not
recognizing the date format. Where am I going wrong.
SELECT TO_DATE('Wed Oct 10 23:50:00 2018 UTC','Dy Mon DD HH24:MI:SS YYYY TZR','NLS_DATE_LANGUAGE = American')
FROM dual;
ERROR at line 1:
ORA-01821: date format not recognized
Use:
SELECT TO_TIMESTAMP_TZ('Wed Oct 10 23:50:00 2018 UTC','DY MON DD HH24:MI:SS YYYY TZR','NLS_DATE_LANGUAGE=American')
FROM dual;
TO_DATE function returns DATE datatype, which does not support timezones. You are using TZR format specifier in your query (time zone region), and this generates the error because DATE does not support this.
This documentation - Time Zones shows which datatypes supports timezones, and states that only TIMESTAMP WITH TIME ZONE and TIMESTAMP WITH LOCAL TIME ZONE do. So you must convert to one of this datatype instead of converting to DATE.
TO_TIMESTAMP_TZ function converts a literal to TIMESTAMP WITH TIME ZONE datatype.
If (and I realise it's a big 'if') the string values always contain UTC and not any other time zone values, then you could just treat that as a character literal. You would do that by changing your format model from TZR, which isn't recognised by to_date(), to "UTC" - including the double quotes:
SELECT TO_DATE('Wed Oct 10 23:50:00 2018 UTC',
'Dy Mon DD HH24:MI:SS YYYY "UTC"',
'NLS_DATE_LANGUAGE = American')
FROM dual;
TO_DATE('WEDOCT1023
-------------------
2018-10-10 23:50:00
Of course, as that is a plain date it still has no time zone information, but if you want to retain that then you need a timestamp with [local] time zone data type anyway.
I am trying to do a simple string to date conversion; however, PSQL complains when there is a timezone in that string. Their documentation clearly states that its supported; however, it complains. I don't even care about the timezone, I just want to convert the string.
db=> select to_timestamp('Mon Feb 23 13:43:07 PST 2015', 'Dy Mon DD HH24:MI:SS TZ YYYY')::timestamp without time zone;
ERROR: "TZ"/"tz" format patterns are not supported in to_date
Postgres version: 9.3.10
http://www.postgresql.org/docs/9.3/static/functions-formatting.html
Why not try a straight cast?
SELECT 'Mon Feb 23 13:43:07 PST 2015'::timestamp with time zone
Once you've done this it's pretty easy to work with the date object.
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
I'm trying to load FLATFILE data to Oracle via Sqlloader, but I'm having trouble with a timestamp(6) field.
I have timestamp values in the below format:
Wed May 08 00:00:00 UTC 2013
I need sqlloader code to load this time format in oracle.
My current sqlloader code is below
LOAD DATA
INFILE 'MYDIR/my_documents_data.dat'
TRUNCATE
INTO TABLE sample_table
FIELDS TERMINATED BY '|'
TRAILING NULLCOLS
(
"MYID" INTEGER EXTERNAL,
"NAME" CHAR(100),
"DOCUMENTTYPE" CHAR(250),
"DATEADDED" TIMESTAMP,
"DOCUMENTSIZE" INTEGER EXTERNAL
)
Please advise me which format should I apply for this column "DATEADDED" TIMESTAMP, which is actually a timestamp(6).
Wed May 08 00:00:00 UTC 2013
Given that sample, the proper format is probably:
DY MON DD HH24:MI:SS TZR YYYY
See http://docs.oracle.com/cd/E11882_01/server.112/e26088/sql_elements004.htm#SQLRF00212 for the detail of the various fields.
You have to load your data as a timestamp with timezone though, because I used TZR to map the UTC part of your data. Something like that:
...
"DATEADDED" TIMESTAMP WITH TIME ZONE "DY MON DD HH24:MI:SS TZR YYYY"
...
If you really want a timestamp without timezone, use that format instead:
DY MON DD HH24:MI:SS "UTC" YYYY
This will assume that all your timestamps are UTC and will silently discard that information.
...
"DATEADDED" TIMESTAMP "DY MON DD HH24:MI:SS "UTC" YYYY"
...