Problem
My 24 timezone codes are like EAT, ICT, NZT and I need to use the SnowFlake Convert_timezone function to convert the American Eastern time to the timezone that the records have. But SnowFlake Convert_timezone function only supports timezone in standard iana.org time zones format. So what is the best way to map my 24 time zone to the right formate so that the function can work as expected?
I did not figure out how to set up the standard iana.org time zones database and how to convert my time zone code into theirs, please help! thanks in advance!
Sample code
Convert_timezone('American/New_York', my_time_zone_code, my_timestamp) as normalized_time
Error
Unknown timezone: PST
EAT
East Africa Time, or EAT, is a time zone used in eastern Africa. The time zone is three hours ahead of UTC (UTC+03:00), which is the same as Moscow Time, Arabia Standard Time, Further-eastern European Time and Eastern European Summer Time.
Can be safely mapped with snowflake time as below
Africa/Nairobi
ICT
Indochina Time (ICT) is 7 hours ahead of Coordinated Universal Time (UTC).
Iana Timezones where ICT is currently observed.
Can be safely mapped with snowflake time as
Asia/Ho_Chi_Minh
Asia/Bangkok
Asia/Phnom_Penh
Asia/Vientiane
NZT
Most of the time of NZT will be associated with below two zones, to covert it to snowflake standards you have to
divide these zones based on location either one of them
Pacific/Auckland
Pacific/Chatham
Hope this will help
Thanks
Palash
As per Snowflake documentation currently PDT timezone is not supported.
https://docs.snowflake.com/en/sql-reference/parameters.html
However you can follow below link to set system timezone preference.
https://support.snowflake.net/s/question/0D50Z00007MilHISAZ/snowflake-system-timezone-preference
Related
Is there any convention to add in a local timezone (whatever the user has set it as) in a database?
For example, like I can do the following for UTC time:
2014-01-01 01:02:03Z
Is there something like the following to mean local time?
2014-01-01 01:02:03L
Or some other suffix where it can either pick up the user's system time or take it from a variable that can be set? For example, something like (for Postgres):
ALTER DATABASE postgres SET timezone TO 'Europe/Berlin';
This has nothing to do with Postgres.
The format you're asking about is ISO 8601. Specifically in that format, the absence of a Z or an offset such as -07:00 or +05:30 is defined as "local time".
So what you are looking for is a string without an offset, such as 2014-01-01T01:02:03.
postgres would use the system timezone, or what you called local, if no timezone is specified. see manual
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.
...
Conversions between timestamp without time zone and timestamp with time zone normally assume that the timestamp without time zone value should be taken or given as timezone local time.
Your concept is flawed for a couple of reasons:
A user in Germany connects to a Web server in England that connects to a database server is America. What constitutes local?
More to the point Postgres does not store the time zone in with time zone fields. So you will not recover the entered time zone on data retrieval.
If you are dealing with multiple time zones then the field you need to use is timestamp with time zone. This will rotate entered timestamp values to UTC for storage. You now have a fixed point in time that you can rotate to whatever 'local' time you want on retrieval.
Just treat the undecorated time as a timestamp with time zone:
richard=> SET timezone='Europe/London';
SET
richard=> SELECT '2022-08-27 21:42:22.25891'::timestamptz;
timestamptz
------------------------------
2022-08-27 21:42:22.25891+01
(1 row)
richard=> SET timezone='Europe/Paris';
SET
richard=> SELECT '2022-08-27 21:42:22.25891'::timestamptz;
timestamptz
------------------------------
2022-08-27 21:42:22.25891+02
(1 row)
I would like to convert times from pacific to UTC. However, I must first convert the times to either PST or PDT depending on the date. Is there a SQL function that can do this, or does anyone have any advice for creating this function?
The link you provided is pretty much useless as a guide to timestamps. If you are going to work with timezones then store your timestamps in a timestamp with time zone field. The timezone will not actually be stored but the timestamp will be stored as a UTC. Whenever a timestamp is entered it is rotated to a UTC value. This makes working with value easier down the road. If you want to take into account DST transitions you will need to use full timezone names e.g. US/Pacific, as they cover the two offsets(PST/PDT) that constitute the standard/daylight savings timezones. As you found using the offset PST(-08) or PDT(-07) gets you a fixed offset regardless of date.
I’m working with a table that uses date time offset. I have a value that looks like 2020-01-02 13:30:00 -07:00.
Is the time in my time zone 13:30 or do I need to subtract 7 hours from it. I saw people do it differently on YouTube.
In MS SQLServer, the last section of the string representation that you posted of the DateTimeOffset describes the time zone. So, if you are currently located in time zone -7:00 (e.g., Arizona, USA), then the time portion of the string refers to your local time, not UTC. See the Microsoft documentation:
For example, 1999-12-12 12:30:30.12345 -07:00 should be represented [in UTC] as
1999-12-12 19:30:30.12345Z
Someone would subtract the offset from the number only if they want to manually get the UTC value, but that would might produce errors if the data come from a daylight saving time (DST) region, so you would need to enforce DST handling at the time of entry. SQLServer already stores the data in UTC behind the scenes:
The data is stored in the database and processed, compared, sorted,
and indexed in the server as in UTC.
I can't seem to find a question/answer that works for what I'm trying to achieve. Currently, this is how my DB outputs a timestamp:
2015-08-18T19:43:04.738-06:00
However, I would like it to appear as such in the column:
2015-08-18T19:43:04.738 America/Denver
Google has recently changed their formatting options and instead of downloading the output and performing a find/replace, I want an output that doesn't require additional work. I looked on SO and have tried using trim and replace but having no luck.
Thanks for the help in advance!
For whatever reason, the one we've used since February (third from the bottom) no longer works.
2015-08-18T19:43:04.738-06:00 is not quite the right format. Google does not accept milliseconds (which is annoying if they don't just ignore it). You need to send 2015-08-18T19:43:04-06:00. They may have become more strict in what they accept.
Try date_trunc('second', yourtime).
It's not possible to accurately translate an offset like -0600 to a time zone like America/Denver. They say two different things.
-0600 says, with absolute certainty, that this time is 6 hours behind UTC. 12:00:00-06:00 and 18:00:00Z (Z represents UTC) are the same time.
America/Denver means to interpret this timestamp under the rules applicable to the city of Denver, Colorado, USA at that time. To figure out what time it is in UTC you need to look up the offset rules for Denver, Colorado, USA. The offset will change depending on the time of year, usually because of daylight savings time. Because the rules change, it's important to apply the rules as they were at that time.
For example, 2006-03-15 12:00 America/Denver is -0700. But the next year on 2007-03-15 12:00 America/Denver is -0600. Between 2006 and 2007 the daylight savings time rules in the US changed.
Whereas -06:00 avoids all that and simply says the time is offset from UTC by six hours.
You could fake it by simply replacing the offset with America/Denver. So long as you're only sending recent times that should work. You'll be off by at most an hour. But don't do that.
Unless Google Ads specifically needs a time zone there's no point in sending them one. Internally, Postgres is storing your times in UTC anyway and translating them to your server's time zone, America/Denver. Send Google UTC. And, as noted above, chop off the milliseconds.
select date_trunc('second', '2015-08-18T19:43:04.738-06:00'::timestamp with time zone at time zone 'UTC') as datetime;
datetime
---------------------
2015-08-19 01:43:04
I posted a similar question here: https://stackoverflow.com/questions/13923598/department-hours-of-operation-for-different-time-zones-in-sql-server
I think I added too much information to the post :)
What I am trying to do is display hours of operations in different time zones. I am having a difficult time figuring out how to display something like Mon - Fri: 630AM to 630PM (UTC -07:00 Arizona) in every other time zone. I'll get to a point (in another time zone) where Monday is no longer Monday...and I can't seem to figure out how to identify the change.
How do I convert a list of days (Monday, Tuesday, etc...) and Times to every other time zone and find the correct day to use?
Time zones are all relative. Australian Eastern Standard Time is UTC+10 and Eastern Daylight Time is UTC+11. USA Eastern Standard Time is UTC-5 and Eastern Daylight Time is UTC-4. To go from 09:00 21 Dec 2012 Australian EDT to US EST is simply DATEADD(h, -16, '09:00 21 Dec 2012'). The only real trick is knowing when Daylight savings in each zone starts and stops and which juristictions it applies in (Daylight Savings is not observed in Queensland for example).
A google search on time zones will give you the info you need to determine where they sit relative to Universal Time (UTC).
The System.Globilization namespace has everything you could need for this. The datetime class has a lot of methods too.