I want to convert the date from former to later format
2020-04-14T14:56:43
TO
2020-04-14 14:56:43 UTC
Basically how to convert the DATETIME into TIMESTAMP IN Dataprep?
Why would you want to use TIMESTAMP instead of a DATETIME?
because it's smaller in size? (4 bytes vs 8 bytes)
Are you using MYSQL? I understand that there it's converted to UTC on write, and then converted back to the server's timezone on retrieval. (which isn't happening for DATETIME)
Or in general, working with timezones?
anyway, you can just remove the T in the middle between the date and the time by brushing over it, and replacing it with an empty space.
And if you desire to add a timezone (which would be.. +00), you can do that aswell. Trifacta will recognize that as a valid date type.
IF it's a unix-timestamp you're interested in - you can do that aswell with the function "unixtime()".
you can see all the tokens with which to construct and change your datetype here:
https://docs.trifacta.com/display/SS/Datetime+Data+Type
also, the community-website has a lot of dateformats-related questions.
https://community.trifacta.com/s/
Related
How to use to_date function in oracle-sqldeveloper to convert a string
May 1 2019 12:00 to date datatype? Does Date in SQL store time too,
or it only stores date? I tried using the to_date function with some
format but it always removes the time part.
If the time is not possible in Date datatype what could be a good alternative?
You can convert your date to a string with (assuming 24-hour values, which seems likely as you don't have an AM/PM marker):
to_date('May 1 2019 12:00', 'Mon DD YYYY HH24:MI', 'nls_date_language=English')
The format elements are in the documentation. I've included the optional third argument to to_date() because your month name has to be interpreted in English, regardless of your session settings.
it always removes the time part
Oracle dates always have both date and time parts, even if the time is set to midnight. You're probably seeing the result of that query as '01-MAY-19'.
Dates don't have any intrinsic human-readable format; Oracle uses its own internal representation, which you generally don't need to worry about.
In most clients and IDEs the session NLS_DATE_FORMAT setting is used to display native dates as strings. For historic reasons that still defaults to DD-MON-YY, despite Y2K, during database creation. it can be changed at database level, and sessions will then inherit that. But each session can override it, e.g. by issuing:
alter session set nls_date_format = 'YYYY-MM-DD HH24:MI:SS'
You can also explicitly convert a date value back to a string, and specify which format elements you want to include, via a to_char() call. Only do that when displaying a value - if you're storing dates or passing them around to functions, always do that as the proper date data type, not as strings. (If you have to pass them outside the database as strings, e.g. to a remote API, you'd usually want to use an ISO-8601 format).
db<>fiddle showing the default output, explicitly formatted as a string (again, for display only - do not store or manipulate dates as string), and with the session format modified.
In SQL Developer you can also go to Tools->Preferences->Database->NLS and change the 'Date format' there - that setting will then apply when you create new sessions, without having to issue alter session each time.
I have a:
Field in my store as date with dateFormat set to 'Y-m-d'
Column in my grid (datecolumn) - format set to 'Y-m-d'
Editor on Column (datefield editor) - format set to 'Y-m-d'
Postgresql Table with a date column (Note, not a timestamp or timestamptz, but date)
I have data that comes into the store from Postgresql like:
{
mydatefield: "2021-07-30"
}
Now, the date do dispay is 100% correct in the grid. Problem comes in when I select a new date, through the datefield editor, let's say
2021-07-31
The moment it saves back to the server it passes:
mydatefield: '2021-07-30T22:00:00.000Z'
and the server saves it wrong as '2021-07-30' and the grid refreshes back to 2021-07-30.
We are on South African Standard Time (+2) Do not know if it something to do with Daylight Saving
So, to recap. It does not matter what date I select, it keeps saving a day less than the day I selected.
The date it's saving is in UTC, which is the timezone you ought to be using on your server(s) and database(s) - that's a good thing as it removes timezone related info and allows dates to be localized to any timezone.
When you transmit date values over the wire between the server and the browser, make sure you're using RFC-8701 formatted strings (what you get when you call new Date().toJSON() in JavaScript). Then you won't have to worry about timezone issues, as RFC-8701 dates are always in UTC. The browser will take care of transforming dates to local time - just call new Date(myRfcDateString).
More info: Storing date/times as UTC in database
Use convert method of store to process data for date column before storing it in store data. Then the store data will be submitted to server in proper format.
There was similar question asked, links below -
Question - Datefield in grid editor
Fiddle - https://fiddle.sencha.com/#view/editor&fiddle/2e0a
I exported data from an SQLite table to a CSV file. The data includes a timestamp with at least one-minute resolution: "2019-11-15 01:30:06". The data is actually stored as a Julian date, in this case 2458802.35424295. I imported the data into a double-precision field. I need to convert that number into a timestamp with time zone. I tried casting the double-precision number to text and then using to_timestamp(), but that appears to work only with integer days. I can get a timestamp, but it is always at midnight of the correct date. I tried using to_timestamp() passing in my number, but that returns an epoch (number of milliseconds since 1/1/1970).
I could try to take the fractional part of my Julian date value, calculate the number of milliseconds since midnight that represents, use the to_timestamp(text,text) method to get the date I need, and then add the epoch since midnight to that date. But that's awfully cumbersome. Isn't there a better way?
I'm using PostgreSQL 9.3.
NOTE: The simple answer to my problem, which occured to me just before I clicked the Post button, is to export the data in the form I want, using SQLite's datetime() function to convert the number to a date string during export. But I remain curious. I would have thought there would be a standard way to do this conversion.
I have a table that I am using to store iso dates with timezones. I realize that dates should "always" be stored as utc but I have an exception to that rule. The timestamps aren't in any way related to the server they are running on. I want to be able to store an iso date like this:
2016-03-06T01:15:52-06:00
And regardless of the time zone of the server or anything else I want the timestamp returned as:
2016-03-06T01:15:52-06:00
Currently if I insert an iso date it automatically converts it to whatever the server timezone is. My above date gets converted to:
2016-03-06 07:15:52+00 (server is utc)
The only thing I can think of is storing the timezone offset in a separate column, storing my date as utc and then converting using the offset column, horribly messy. Surely there is a way to store my date in one column and get it out the way it was originally created?
Your proposed solution is correct. Or more precisely, it is one of several correct implementations. Any of the following would work:
Store the UTC timestamp in one field, store the offset in another.
Store the local timestamp in one field, store the offset in another.
Store the local date in one field, and store a time with time zone in another. (though time with time zone is generally discouraged...)
Store the UTC timestamps in one field and the local timestamp in another.
The easiest by far is the first one, which you already proposed.
I'd avoid against storing timestamps in text fields, as they tend not to be very efficiently searchable.
Also note - if you're coming from a SQL Server background, you might recall its datetimeoffset type, which stores the local datetime and offset in the field, and uses the UTC equivalent during indexing. It's common to think that Postgres and MySQL's timestamp with time zone would have the same behavior, but they don't. They simply use the session time zone to convert to/from UTC. SQL Server has no concept of a session time zone, and thus the discrepancy.
Be sure to read this part of the Postgres docs.
Is there a way to store a date in a PostgreSQL db using the Ethiopian date format? I'm trying to store 29th or 30th of February but it throws an error, because in the Julian calendar there's no such thing. Any inputs?
I am not sure that I'll tell you something new but...
Databases are used by programs or by interfaces, I never saw databases that are used by end-user in console with psql.
If you are develop an application, that must display dates in specific calendar, you can store date in PostgreSQL in TIMESTAMP. All operations with dates will work correct in database. But you have to implement conversion from TIMESTAMP into string representation and vice versa in your application manually. If this is most important thing for your application, you will do this.
All queries that must return date you will write with conversion into DOUBLE PRECISION e.g.
SELECT EXTRACT(EPOCH FROM timestamp_field)
This returns DOUBLE PRECISION value that represents timestamp in numerical format.
All date parameters in queries you have convert from numerical presentation in TIMESTAMP using built-in function to_timestamp:
update table_name set
timestamp_fileld = to_timestamp(1384852375.46666)
The other solution is to write psql functions that do this for you directly in queries, but anyway you need to handle each input/output of date fields in queries.