, week, year, day, etc. The cast to date ( day::date) does that implicitly. The following example shows how to use the date_trunc () function to truncate a timestamp value to hour part, as follows: SELECT date_trunc('hour', TIMESTAMP '2022-05-16 12:41:13. The table currently has nearly 5 million rows and this query currently takes 8 seconds to execute. of ("Asia/Tehran")). Functions but this works for my case. Issue in creating a function in PostgreSQL using date_trunc. how to get only month and year in Postgres. Create Postgresql index with date_trunc. この. How to use the date_trunc function for biweekly grouping. My Postgres version: "PostgreSQL 9. The real usefu. SELECT * FROM table WHERE DATE_TRUNC('day', date ) >= Start Date AND DATE_TRUNC('day', date ) <= End Date Now this solution took : 1. The problem is we use Sunday as the first day of the week on our reports and PostgreSQL uses Monday as the. These SQL-standard functions all return values based on. With PostgreSQL there are a number of date/time functions available, see here. Example: PostgreSQL DATE_TRUNC() function : Example: Code: SELECT date_trunc('hour', timestamp. The following illustrates the syntax of the PostgreSQL TRUNC() function:. The PostgreSQL TRUNC() function returns a number truncated to a whole number or truncated to the specified decimal places. The DATE_PART() function extracts a subfield from a date or time value. Postgresql date_trunc with time zone shifts zone by 1 hr. Is there a way I could update based on a date range in a postgres DB? Meaning if I have a row with following values, name code some_timestamp abc 1 2020-09-07T13:22:23. 2. , line 01 (2011/01/03 19:18:00. For the date_part and date_trunc functions, arguments can be `year', `month', `day', `hour', `minute', and `second', as well as the more specialized quantities `decade', `century', `millenium', `millisecond', and. Current Date/Time. confusingly at time. PostgreSQL provides a number of functions that return values related to the current date and time. To top it all off, you want to cross-tabulate. Truncate date in units other than default choices using date_trunc (Postgres 9. @mu is too short: I'm actually porting Oracle specific Java code to Postgres so I substituted Oracle's trunc w/ POstgres' date_trunc to achieve the same result. date_trunc still gives me the whole date. user330315. date_trunc() in Postgres is the equivalent to trunc() for dates in Oracle - but it's not needed for date values in Postgres as a date does not contain a time part. date_trunc('hour', timestamp '2001-02-16 20:38:40') → 2001-02-16 20:00:00. Share. Thanks again! 👍 1. Syntax. 1 Truncate a date in Postgres (latest version) 0 PL/PGSQL function - passing a TEXT argument to date_trunc() 0. answered Aug 18, 2015 at 10:52. 1. But the week starts on Monday in Postgres by default. Users can add new types to PostgreSQL using the CREATE TYPE command. PostgreSQL provides a number of functions that return values related to the current date and time. PostgreSQL provides a number of functions that return values related to the current date and time. CURRENT_DATE: DATE: Return the current date: CURRENT_TIME: TIMESTAMPTZ: Return the current time: CURRENT_TIMESTAMP: TIMESTAMPTZ: Return the current date and time with time zone at which the current transaction starts: DATE_PART: DOUBLE PRECISION: Get a field of a timestamp or an interval e. Use the PostgreSQL AGE () function to retrieve the interval between two timestamps or dates. In this method, you ensure what the time portion is set as (or at least with far more certainty). the postgres server timezone. date_trunc 9. In our example, we use the column end_date (i. ). 9. Trimming trailing :00 from output after date_trunc. This is used in subquery cal to generate a list of all dates in your data. 0. This is an excerpt from my sql query. date) going over the date/time functions in. milliseconds contains seconds & microseconds contains milliseconds (and thus seconds too). In fact extract() gets re-written to date_part() - check the execution plan and you will see. 2: date_trunc('hour', timestamp '2001-02-16 20:38:40') 2001-02-16 20:00:00:. Below is the query. postgres =# select extract (epoch from '2023-09-05 12:00:00':: timestamp); date_part-----1693915200 Register as a new user and use Qiita more conveniently You get articles that match your needsIn existing versions of Postgres, you can use arithmetic: select t. SELECT cast (created_at as date) as created_at, count (created_at) FROM forms group by 1 ORDER BY created_at asc; If you want the date in a particular time zone, date_trunc with that time zone then cast to a date. I have a PostgreSQL table called tickets_details, which has many columns and is constantly updated only on the rows of the current day, it also inserts thousands of rows of the current day that have. 1 Answer Sorted by: 1 Oracle's DATE data type (which is what sysdate returns) always contains a time part which can not be removed. EXTRACT (MONTH FROM input) AS "Month". 시간값 내림: DATE_TRUNC. g. 「今日の日付（今日の0時）がほしいんだけど、、、」と思ったときにしょうもない落とし穴にハマってしまったので、. ) This function takes two arguments. 29 illustrates the behaviors of the basic arithmetic operators ( +, *, etc. Syntax: date_trunc(text, timestamp) Return Type: timestamp. ; delimiter_text (required): Text representing the delimiter to split by. The straightforward way to do it is like this: select date_trunc('minute', now()) Edit: This truncates to the most recent minute. Then the following WHERE clause can be used 9as was shown above: WHERE time >= date_trunc ('hour', now ()) - INTERVAL '1 hour' AND time < (date_trunc ('hour', now ())) However to work with our. "createdAt" between '2021-05-10' and '2021-05-17' and e. This function truncates a date/time value to a specified precision. PostgreSQL releases before 8. Date and Time Functions are scalar functions that perform operations on temporal or numeric input and return temporal or numeric values. The date_trunc function truncates a TIMESTAMP or an INTERVAL value based on a specified date part e. The DATE_TRUNC () function is used to truncate a date, time, or timestamp to a specified interval, such as the day, week, or month, in PostgreSQL and SQL. created_at as timestamp) So your final query should be something like: SELECT (date_trunc ('day', CAST (transactions. ADVERTISEMENT. 61 Avg. Follow. The precision values are a subset of the field identifiers that can be used with the EXTRACT() and DATE_PART() functions. ) This function takes two arguments. In Postgres, the EXTRACT(), DATE_TRUNC(), and DATE_PART() functions are used to extract the month from a date field and then use the GROUP BY clause to group the results by month. In time-series analysis, the granularity could be on intervals of years, quarters, months, weeks, days, or hours. g. (Values of type date and time. The date_trunc () function is used to truncate to specified precision. The date_trunc function truncates a TIMESTAMP or an INTERVAL value based on a specified date part e. SELECT DATE_TRUNC('month', TIMESTAMP '2005-05-21 15:30:30'); Result: 2005-05-01 00;00:00 The PostgreSQL DATE_TRUNC function is used to truncate the date and time values to a specific precision (into a whole value), such as 'year', 'month', 'day', 'hour', 'minute', or 'second', in a string format. . In PostgreSQL, DATE_TRUNC Function is used to truncate a timestamp type or interval type with specific and high level of precision. Share. Related: Ignoring time zones altogether in Rails and PostgreSQL;I need to query for a date like the one in my code, and in postgreSQL i found date_trunc to "cut off" unnecessary information from the date. 4, PostgreSQL 9. SELECT '2022-09-18':: date + INTERVAL '1 year'; In the above code, We have used typecast (::) operator to convert a value of one datatype into. In PostgreSQL I am extracting hour from the timestamp using below query. 9. I want to have it trucated according to the displayed timezone. only date_trunc(text,interval) and date_trunc(text,timestamp) are immutable. I am trying to get only date without time in postgres from the following statement: select current_date - date_trunc ('day',interval '1 month'); But returns me that: 2023-02-07 00:00:00. To filter this to only the most recent completed hour, so like the original post: if the current time is 2:30,. Table 9. day. date_trunc can be really helpful if you want to roll up time fields and count by day or month. 2014-05-09 16:03:51 will be returned as 2014-05-01 00:00:00. So current_date - 1 would be enough. Need group data by each line time interval, e. I have this problem. For types without standard mathematical conventions (e. POSTGRESQL Course Bundle - 5 Courses in 1 | 1 Mock Test. date_trunc() "rounds" the value to the specified precision. You can then convert it to whatever you want (decimal would be a good choice). Sorted by: 3. 9. That is easy enough to add. Syntax. You can now use date_trunc (text, timestamp) with Doctrine! Note: You can easily adapt this code for every additional Postgres/MySQL function. 2. As you don't want to include rows from "this" month, you also need to add a condition for that. If you prefer to write standard SQL, stick to extract(). This function can be used to round the timestamps to the required interval, say year, day, hours or seconds. In your example, you could use: SELECT * FROM myTable WHERE date_trunc('day', dt) = 'YYYY-MM-DD'; If you are running this query regularly, it is possible to create an index using the date_trunc function as well: The precision values are a subset of the field identifiers that can be used with the EXTRACT() and DATE_PART() functions. g. MessageText: function date_trunc(unknown, timestamp with time zone, unknown) does not exist Hint: No function matches the given name and argument types. ) in a Spring Boot application with Hibernate running on top of a Postgresql database. 3. 0. The query will return a result with a single column labeled “uptime” that represents the duration of the PostgreSQL database server’s uptime. Current Date/Time. "deleted_at" IS NULL). 1994-10-27. 300 and 19:28:00. Or simpler, use the column number: group by 1 (if the expression is the first column in the select clause). CREATE TABLE measurement_1301 ( CHECK ( date_trunc( 'week', logdate )::date = DATE '2013-01-07') ) INHERITS (measurement); CREATE TABLE measurement_1302 (. Read more about PostgreSQL and time series right now: my blog post about using string encoding to find patterns in timeseries has further. 1) precision The precision argument specifies fractional seconds precision of the second. 8. The output snippet shows that the DATE_PART() function pulls out the year from the given date. 876944') * 1000; would give. In Postgresql, we can also add a year to the current date using the INTERVAL data type. If it doesn't work I might try what you said i. Sorted by: 3. 5. 1. Recently, I have been getting familiar with PostgreSQL (using 8. The. 8) Postgres DATE_TRUNC() Function. The LOCALTIME function takes one optional argument:. Introduction to the PostgreSQL date_trunc function. The input timestamp is truncated to the precision of the input datepart. 1. - It retrieves the trimmed part with a specific precision level. 2014-05-09 16:03:51 will be returned as 2014-05-01 00:00:00. In Postgresql, we can also add a year to the current date using the INTERVAL data type. 9. 1 Answer. 7. Functions and Operators. select date_trunc('month', current_date) + interval '1 month - 1 day'; Tip 2 You can also create an interval using make_interval function, useful when you need to create it at runtime (not using literals): SELECT date_trunc ('month', l_date) month FROM this_table GROUP BY month. create function end_of_month(date) returns date as $$ select (date_trunc('month', $1) + interval '1 month' - interval '1 day')::date; $$ language 'sql' immutable strict; EDIT Postgres 11+ Pulling this out of the comments from @Gabriel , you can now combine interval expressions in one interval (which makes things a little shorter): However, date_trunc('day', created) is not equivalent to the other expressions, because it returns a timestamp value, not a date. 0. . source is a value expression of type timestamp or interval. You cannot convert an interval to a timestamp, since they are two separate things. 1) 2. ; some date parts include others: i. AND (date_trunc( 'day', current_timestamp AT TIME ZONE 'America/Santo_Domingo' ) AT TIME ZONE 'America/Santo_Domingo') +. date_trunc('datepart', field) The datepart can be day, second, month, and so on. 9. Ask Question Asked 10 years, 9 months ago. PostgreSQL : Converting timestamp without time. 600 is 10 minutes in seconds. These SQL-standard functions all return values based on the start. Is there any way possible or workaround I can do to say that the first month of first quarter is for instance September? So instead of the traditional: Q1: 1-3, Q2: 4. I just sent a note about that to the pgsql-docs mailing list so hopefully it will be fixed soon. Jun 2 at 11:46. POSTGRESQL Course Bundle - 5 Courses in 1 | 1 Mock Test. 切り捨ては抽出とは異なります。例： タイムスタンプを四半期まで切り捨てると、入力タイムスタンプの四半期の最初の日の真夜中に対応するタイムスタンプが返されます。 The date_trunc() function is used to truncate to specified precision. The query below shows sample data of your user adding an other user with a session over two days (to demonstrate the principle) The subquery day_cnt calculates the minimal start date of the sessions and the count_days that is covered with the sessions. . This is a timestamp with time zone value which refers in fact to 23:59:59 on sunday, but with 2 hours of difference with UTC time, depends on your locale and settings. Translate to PostgreSQL generate_series #2144. Truncate to specified precision. These SQL-standard functions all return values based on. SELECT date_trunc ('month', l_date) month FROM this_table GROUP BY month. *, min (date_trunc ('week', date)) over () as first_week from t ) t; Here is a db<>fiddle. If you don't have new users every minute, you're going to have gaps in your data. If so, use date_trunc(): select date_trunc('month', order_date) as yyyymm If you really want a string, you should accept Nick's answer. Depending on your requirements, another option is to adjust the precision of the timestamp column itself -. Unless otherwise noted, operators shown as accepting. 9. (Values of type date and time are cast. date_trunc() is not marked immutable because some input parameters can make it dependent on the environment so that it might return different results in different situations - which is not allowed for immutable functions. 662522'); date_trunc --------------------- 2022-05-16 12:00:00. 8) Postgres DATE_TRUNC() Function. 4 and i noticed a strange behavior when using date_trunc. SELECT TO_CHAR(timestamp_column, 'YYYY-MM-DD HH24:MI') AS formatted_ts FROM table_name;. . create index on test (date_trunc('month', foo::timestamp )); the problem with foo at time zone 'GMT' is that the expression foo at time zone 'GMT' is not itself immutable. 9. 4. You can use the Now () function in PostgreSQL to display the current date and time without any mention of milliseconds. Modified 10 years, 9 months ago. 9. I think, what you want to do is: SELECT date (updated_at), count (updated_at) as total_count FROM "persons" WHERE ("persons". 1) number The number. Postgresql date_trunc function. Trimming trailing :00 from output after date_trunc. now (). The most convenient method to group table data is the DATE_TRUNC() function, which allows us to truncate a timestamp to a specific level of precision, such as the month, day, hour, etc. PostgreSQL's date_trunc in mySQL. However, you can set the time portion of a timestamp, dropping the date portion entirely with date_trunc. Either truncate the timestamp by minutes using date_trunc, which will return a timestamp without seconds, or use to_char if it is only about formatting the output: SELECT date_trunc ('minute',VISIT_DATE) FROM t; SELECT to_char (VISIT_DATE,'yyyy-mm-dd hh24:mi') FROM t; Demo: trunc() will set that to 00:00:00. I want to create an index that returns the same output as this query; --takes 2005-10-12 select date_trunc ('month',table_withdates. 0. Share. Share. 94. 2. The day (of the month) field (1 - 31). date_trunc(text, timestamp) timestamp: Truncate to specified precision; see also Section 9. date_trunc. PostgreSQL provides a number of functions that return values related to the current date and time. The day (of the month) field (1 - 31). If you want to cast your created_at field, you have to write like this as following: CAST (transactions. 5. For formatting functions, refer to Section 9. DATE_TRUNC() will return an interval or timestamp rather than a number. 9. and while the condition is > '2018-10-01' then all dates in the month October will not be shown in the result. Sorted by: 3. Follow answered Feb 26, 2018 at 23:30. SELECT date_trunc ('month', CURRENT_DATE); Last day isn't much more difficult either. When storing a date value, PostgreSQL uses the yyyy-mm-dd format e. For. Specifying the time zone in date_trunc is not supported in Postgresql 11. So fellow SQL aficionado's how to take the following WHERE clause in PostgreSQL and convert it to SQLite3 without using a compiled extension: WHERE DATE_TRUNC ('day', c. 0. Delaying Execution 9. update foo set created_at = date_trunc('second', created_at) where created_at is not null; Instead of using date_trunc you can also just cast the value: created_at::timestamp(0) for the update statement, or current_timestamp::timestamp(0) in the default value. To extract the century from a given date/time value, you can use the extract() function with the "century" field. orm: dql: datetime_functions: date_trunc: YOUR_BUNDLE_HEREDoctrineExtensionsDateTrunc. The function date_trunc is conceptually similar to the trunc function for numbers. postgres sql, date_trunc without extra zeroes. 31 illustrates the behaviors of the basic arithmetic operators ( +, *, etc. 2: date_trunc('hour', timestamp '2001-02-16 20:38:40'). I'm trying to create quarterly average for player scores, however the default behaviour of postgres date_trunc('quarter', source) is that it starts first quarter with YYYY-01-01. 5-container, as PostgreSQL gives me the same output for both the query with and without the join (which in my opinion is the expected. , year, month, week from a date or time value. 1 Answer. SELECT * FROM stud_cmp WHERE DATE_TRUNC ('day', start_date) = '2020-01-01' :: timestamp; In the above example, after comparing the start date and with date_trunc functions, it will display the three records which contain the comparison. Here’s the current timestamp. Sorted by: 1. I edited my full query into my post now. You need to_char () to format a date or timestamp. date_trunc ('hour', created) + extract (minute from created)::int / 15 * interval '15' minute. performance. Fully managed, PostgreSQL-compatible database for enterprise workloads. 0. 1 Answer. Basically this expression gives you the last day of the current quarter (provided that you remove the last closing parenthese, which otherwise is a syntax error). I'm able to recreate this issue in a new clean Docker-TimescaleDB-container (:latest-pg12), but not in an otherwise equivalent PostgreSQL-12. PostgreSQL provides a number of functions that return values related to the current date and time. As far as I understand you want to change the day of the month to 8. Assuming you are using Postgres, you need quotes around your date constant and can convert to the right types: WHERE job_date >= DATE_TRUNC('month'::text, '2019. Otherwise, the result has the same day component as date. Or simpler, use the column number: group by 1 (if the expression is the first column in the select clause). If you want just the date in the current time zone, cast to a date. These SQL-standard functions all return values based on. ) from a date or time. As shown in the results, the hours and above are preserved, while the minutes and seconds is truncated. Gordon Linoff went further in his. Apparently, the PostgreSQL planner does not evaluate functions. Hot Network QuestionsFirst day is easy. date_created) )AS DAY, this is my output 2013-02-04. 0. Since this is a performance-critical part of the query, I'm wondering whether this is the fastest solution, or whether there's some shortcut (compatible with Postgres 8. timestamp '2001-09-29 03:00' - timestamp '2001-09-27 12:00'. This is the query: select to_char (calldate,'Day') as Day, date_trunc (calldate) as transdate, Onnet' as destination,ceil (sum (callduration::integer/60. - Return Type: TIMESTAMP. create index on test (date_trunc('month', foo::timestamp )); the problem with foo at time zone 'GMT' is that the expression foo at time zone 'GMT' is not itself immutable. I have TableA and it has a field of time_captured | timestamp without time zone | default now () It is being used to record when data was inserted into the table. If I use it like ths: select trunc(now(),'MM'). date_trunc関数. To generate a series of dates this is the optimal way: SELECT t. (In our example, we used month precision. 0. In this case, PostgreSQL decided to launch two parallel workers and the overall query performance improved almost 1. to_char and all of the formatting functions let you query time however you want. l_date is the column where I would pull the date from. I've tried a few ways in my controller:In PostgreSQL, the DATE_PART () function is used to query for subfields from a date or time value. Table 9-27 illustrates the behaviors of the basic arithmetic operators ( +, *, etc. I'm making my first laravel project, using postgres, and I'd like to be able to access all the people with a birthday this month (my people table has a birthdate field that's a date). The date_trunc() function in PostgreSQL is used to truncate a timestamp or interval value to a specified unit. I have a table with a date field in timestamp format (ex: 2016-11-01 00:00:00). Get the first date of an ISO 8601 year and week. 3. Fixes dates issues with admin for AB#12983 and. ISFINITE. date_trunc. postgresql ignore milliseconds from timestamp when doing a select statement. Table 10-4. 7) PostgreSQL Now (): Display without milliseconds. You might need to add explicit type casts. , are used to compare the dates in Postgres. SELECT date_trunc('MONTH', CURRENT_DATE) + INTERVAL '1 MONTH - 1 DAY'; Tip 2. If so, use date_trunc(): select date_trunc('month', order_date) as yyyymm If you really want a string, you should accept Nick's answer. You need to remove the time from time component. Friday afternoon and I'm fried. Data granularity measures the level of detail in a data structure. to_char and all of the formatting functions let you query time however you want. Pictorial Presentation of PostgreSQL DATE_TRUNC() function. This is an example:date_trunc('week', column_name) It uses the ISO definition of a week (as does Oracle's 'IW' ) so you need to apply the same date logic you used in Oracle to get the non-standard start of the week: date_trunc('week', column_name + 1) - 1PostgreSQL DATE_TRUNC by 2 Weeks. Table 9. "GROUP BY date_trunc also? @Bravo: yes you need to repeat the expression in the group by clause. Current Date/Time. However, Postgres' date type doesdate_trunc ( text, timestamp) → timestamp. 0 did not follow the conventional numbering of millennia, but just returned the year field divided by 1000. 这是 PostgreSQL date_trunc() 函数的语法： date_trunc ( field TEXT , source TIMESTAMP ) -> TIMESTAMP date_trunc ( field TEXT , source TIMESTAMPTZ , time_zone TEXT ) -> TIMESTAMPTZ date_trunc ( field TEXT , source INTERVAL ) -> INTERVAL In Postgresql, to truncate or extract the week of the timestamp value, pass the week as a string to the date_trunc function. 5 times. If you need to, you can have your own in the following ways as a. date_trunc¶. I think the shortest and most elegant way to solve this issue is to use date_trunc ('quarter',d) (which will retrieve the start of the quarter) + 3 months - 1 day, and use the expression to create a FUNCTION: CREATE FUNCTION end_of_quarter (d date) RETURNS date AS $$ SELECT CAST (date_trunc ('quarter', d) + interval '3 months' -. 9. 2, PostgreSQL 9. These SQL-standard functions all return values based on. The function date_trunc is conceptually similar to the trunc function for numbers. The resulting interval is can the be added to the desired date to give the desired date with the prior time. g. 082224') GROUP BY date (updated_at) ORDER BY count (updated_at) DESC -- this line changed! Now you are. date_trunc always returns a timestamp, not a date. day::date FROM generate_series (timestamp '2004-03-07' , timestamp '2004-08-16' , interval '1 day') AS t (day); Additional date_trunc () is not needed. 4. select date_trunc('week','2005-07-12'::timestamp)::date; date_trunc ----- 2005-07-11 (1 row) More info:. The time zone in result is shifted by 1hr: select date_trunc('year','2016-08-05 04:01:58. Learn how to round or truncate timestamps in PostgreSQL for effective time-based grouping using the date_trunc function. g. 2. The. Improve this answer. Postgres date_trunc quarter with a custom start month. 11. I have a table partitioned per month (timestamp column). EXTRACT, date_part 9. A primer on working with time in Postgres. These SQL-standard functions all return values based on. The equivalent for your case is date (): select date (created_at), count (*) from requests . SELECT date_trunc('day', some_timestamp AT TIME ZONE users_timezone)::date AS the_date; which casts the result to a Date, rather than. Asked 10 years, 9 months ago. 閾値として、0msecちょうどで更新日時を比較したい時にdate_truncを使用したので、その備忘録。 PostgreSQLで記述。 秒で指定した場合. The PostgreSQL DATE_TRUNC function is used to truncate the date and time values to a specific precision (into a whole value), such as 'year', 'month', 'day', 'hour', 'minute', or 'second', in a string format. This generates a timestamp value, that you can cast if you. Yes, that is how you use date_trunc. The below will index but returns with timestamp added to date which. It is is IMMUTABLE (for timestamp without time zone). In your example, you could use: SELECT * FROM myTable WHERE date_trunc('day', dt) = 'YYYY-MM-DD'; If you are running this query regularly, it is possible to create an index using the date_trunc function as well:The DATE_TRUNC() function will truncate timestamp or interval data types to return a timestamp or interval at a specified precision. The second is more concise, but Postgres-specific. These SQL-standard functions all return values based on the start time of the. values date_trunc ('HOUR', TIMESTAMP ('2017-02-14 20:38:40. 000000' AND '2012-11-07 12:25:04. How can I do this? I tried this and it did not work as expected. Truncate to specified precision; see Section 9. EXTRACT() : century. , hour, week, or month and returns the truncated timestamp or interval with a level of precision. 1) 2. Use the aggregate FILTER clause in Postgres 9. g. Postgres, Update TIMESTAMP to current date but. Therefore you can use the date_trunc function which turns a precise timestamp into day, week, month, etc. The function date_trunc is conceptually similar to the trunc function for numbers. Also per the H2 docs Trunc:. We’ll use it for different intervals to see the result. But in the check constraints, I see that the truncated date is being shifted. Follow answered Aug 28, 2015 at 6:57. However, I am trying to do a select and ignore milliseconds. Postgres date_trunc quarter with a custom start month. Use the DATE_TRUNC() function if you want to retrieve a date or time with a specific precision from a PostgreSQL database. SPLIT_PART. (Values of type date and time are cast automatically to timestamp or interval, respectively. Alternatively, create a function in postgres date_trunc_day(timestamp) that calls date_trunc('day', timestamp) and call the new function instead. I will get the same.