![]() This behaviour can be overriden by passing the useTz option (. Reading dates from the database Convert the UTC timestamp to a datetime object with datetime.utcfromtimestamp(). ![]() HINT: Perhaps you need a different "datestyle" setting. By default PostgreSQL creates column with timezone (timestamptz type). The code seems fine, except the following error pops up: ERROR: date/time field value out of range: "" Then I add the query to copy data into the table: COPY bikes( ![]() Is there a way to specify the format of the columns to import? Also, I do not need to import all columns from the csv file: can I leave some out? Detailsįirst, I wrote the code to create the table (sorry if column names are in Italian, but it's not important): CREATE TABLE IF NOT EXISTS bikes ( I read online and on other Stack Overflow answers that one can SET the datestyle to be different, but it's not recommended. PostgreSQL reads these columns expecting an ISO format "yyyy/mm/dd", but my data has it in another format: "dd/mm/yyyy". I believe my query is correct, but there are some problems in parsing DATE and TIMESTAMP columns. csv files, which I want to import into a local database. It wasn’t until I tried to format the dates using postgres that things started to get confusing.I have a long series of. Without going into details, all of this has been working without any hiccups. If a string representation of a date, time, or timestamp value does not correspond to a real date or time, Java adjusts the value. Then there’s editing - star_date/ end_transmission is displayed using the users local timezone. Returns the SQL Date object matching the given bytes with OidDATE. Of course, there are other things going on - when creating a log, star_date is set to the end_transmission of the previous record. Which is confusing, if Ecto is storing dates in postgres using UTC, then shouldn’t the select statement with the at time zone clause work? However, if I use Ecto to retrieve the record and modify the date using: ( log.end_transmission, tz_user ) |> Timex.format!("") Epoch dates for the start and end of the year/month/day. If I do the same thing, but with a time zone: select end_transmission at time zone 'AEST' from captains_log where id = 4882 Easy epoch/Unix timestamp converter for computer programmers. In the case of the “8:48am” example (above), if I run the following on postgres: select end_transmission from captains_log where id = 4882 In the case of creating a new log, end_transmission is set using Timex.now - just before it is inserted via Ecto. |> validate_required( )Īnd here’s my migration: defmodule doĪdd :user_id, references(:users, on_delete: :nothing) Here’s what my schema looks like: defmodule doįield :end_transmission, So how are dates/times stored in postgres by Ecto? Can I write a server-side query that adjusts to the desired timezone? The timezone for each user may be different, what can I pass up to postgres so I can make the query work for different time zones? Ways to store and display date and time in PostgreSQL By default, Postgres represents dates following the ISO 8601 standard. AEDT isn’t much better, “8:48” appears as “10:48am”. The date is not adjusted for my time zone (as I had assumed would be the case). ![]() If I do something like the following: select end_transmission at time zone 'AEST' from captains_log However, now I’d like to achieve this server-side. Timestamp with timezone (Timestamptz) has DateTime as default type. |> oup_by( fn ( log ) -> Timex.to_date(log.end_transmission) end ) Time with Timezone (timetz) has as default DateTimeOffset. Star_date: ( log.star_date, tz_user ),Įnd_transmission: ( log.end_transmission, tz_user ) For example, I might do something like this: tz_user = ( "Australia/Hobart", Timex.now )Ĭaptains_log = CaptainsLog.list_logs_for_user( current_user ) What I’ve been doing (until now) is retrieve the data, converting the dates using Timex and then run the sorting client-side. today is at the top of the list) and then sort results in each day chronologically.įor this to work properly, I need to apply the users timezone before processing the sort. When I show results to the end user, I show days in reverse order (i.e. In my phoenix application, I’ve been using Ecto with Timex to store my dates in postgres.
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