These SQL-standard functions all return values based on the start. Table 9. Fully managed, PostgreSQL-compatible database for enterprise workloads. , year, month, day, etc. Herouth Maoz <[email protected]. date_trunc ('hour', created) + extract (minute from created)::int / 15 * interval '15' minute. The resulting interval is can the be added to the desired date to give the desired date with the prior time. Date and Time Functions are scalar functions that perform operations on temporal or numeric input and return temporal or numeric values. Date/Time Types Name Storage Size Description Low Value High Value Resolution timestamp [ ( p ) ] [ without time zone ] 8 bytes both date and time (no time. One way to do this is to "truncate" the date to the start of the month, then add 8 days: vardate := date_trunc ('month', vardate)::date + 8; date_trunc returns a timestamp that's why the cast ::date is needed. create index concurrently index_requests_on_request_time_in_chicago on requests (timezone('america/chicago', request_time)) After creating the index and re-running with. select extract (isoyear from current_date); select extract (week from current_date); But there seems to be no inverse. About;. Simplify calculation of months between 2 dates (postgresql) 0. dateoftransfer::date)::Date from table_withdates; --returns 2005-10-01. Thanks, but just for your own sake, you should maybe consider making use of Hibernate APIs if you want to get the best out of your ORM. 31 illustrates the behaviors of the basic arithmetic operators ( +, *, etc. DATE_TRUNC ('month','2020-09-12 15:23:00+05:45') gives 2020-09-01 05:45:00+05:45. the_date 2000-12-31 00:00 Is there a way to tell date_trunc to do day/month/year conversions based on the timezone it is feeded with? The expected output would be: 2001-01-1 00:00+0100 With PostgreSQL there are a number of date/time functions available, see here. You cannot convert an interval to a timestamp, since they are two separate things. If you want both quarter and year you can use date_trunc: SELECT date_trunc ('quarter', published_date) AS quarter. What is the JPQL/JPA/Hibernate equivalent of the database function date_trunc('day', (entity. The PostgreSQL LOCALTIME function returns the current time at which the current transaction starts. And I have set up partition table for every month. PostgreSQL provides a number of functions that return values related to the current date and time. Get subfield. if you want timestamp instead of timestamptz cast the date to timestamp first. This isn't a general replacement, but it works to remove the time portion of a date. Sorted by: 3. 2: date_trunc('hour', timestamp '2001-02-16 20:38:40'). Add date_bin function Similar to date_trunc, but allows binning by an arbitrary interval rather than just full units. start_date) <= DATE_TRUNC ('day', q. date_trunc ('day', TIMESTAMP '2001-02-16 20:38:40+00' AT TIME ZONE 'Australia/Sydney') HTH. Extract isn't quite the same as date_trunc though. Sorted by: 1. 9. "type. For example, month truncates to the first day of the month. but it's greatly complicated by the nature of 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. 9. date_trunc ('day', now ())の落とし穴. EXTRACT, date_part 9. for example 2018-10-15 will be 2018-10-01 and 2018-10-30 also will be 2018-10-01. Friday afternoon and I'm fried. But in the check constraints, I see that the truncated date is being shifted. I will get the same. 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. ) field selects to which precision to truncate the input value. Ask Question Asked 10 years, 9 months ago. The query worked fine in principle so I'm trying to integrate it in Java. Syntax. 0 did not follow the conventional numbering of centuries, but just returned the year field divided by 100. ) and a. 5 introduced a feature called block range indexes (aka BRIN ) that is incredibly helpful in efficiently searching over large time series data and has the benefit of taking up significantly less space on disk than a standard B-tree index. For common time intervals built into date_trunc() (like 1 hour and 1 day in your examples) you can use a shortcut. the Use of the DATE_TRUNC () Function in PostgreSQL. It's not immutable because it depends on the sessions time zone setting. You might need to add explicit type casts. date_trunc('field', source) source is a value expression of type timestamp (values of type date and time are cast automatically). ex: between 2013-04-07 15:30:00, 2013-04-07 15:40:00 5 results. So current_date - 1 would be enough. 3. 5. 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 Server. 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. Read more about PostgreSQL and time series right now: my blog post about using string encoding to find patterns in timeseries has further. PostgreSQL releases before 8. 3. The trunc () function is a mathematical function present in PostgreSQL. PostgreSQL database has a default time zone setting, the operating system’s time zone. This is a timestamp with time zone value which refers in fact to. I'm using a python package called architect that helps in using Postgres partition in Django model. date_created) )AS DAY, this is my output 2013-02-04 00:00:00+00. date_trunc(text, timestamp) timestamp: Truncate to specified precision; see also Section 9. with ats (old_tz) as (select now() ) select old_tz, '2015-12-31'::timestamptz + (old_tz - date_trunc('day', old_tz)) new_tz from ats; OOPS. Note that the latter returns a timestamp with time zone, not a timestamp value. end_date) >= DATE_TRUNC ('day', q. ). select * from table where extract (hour from column1) in (8, 9) where cast (column1 as time) >= '8:00' and column1::time < '10:00'. 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. SELECT EXTRACT(EPOCH FROM TIMESTAMP '2011-05-17 10:40:28. g. Here’s the current timestamp. ADVERTISEMENT. 1 Truncate a date in Postgres (latest version) 0 PL/PGSQL function - passing a TEXT argument to date_trunc() 0. EXTRACT() : century. DATE_TRUNC. 000000' AND '2012-11-07 12:25:04. Current Date/Time. decade. It can also return a number truncated to the whole number if no precision is defined. SELECT date_trunc ('month', l_date) month FROM this_table GROUP BY month. Jun 27, 2014. You can now use date_trunc (text, timestamp) with Doctrine! Note: You can easily adapt this code for every additional Postgres/MySQL function. PostgreSQL provides a number of functions that return values related to the current date and time. Truncate it to the start of the day (still timestamp without time zone ): date_trunc ('day', (now () AT TIME ZONE 'America/New_York')) Get the. Follow answered Aug 28, 2015 at 6:57. These SQL-standard functions all return values based on. 6. This. Follow. These SQL-standard functions all return values based on. SELECT date_trunc('day', CURRENT_TIMESTAMP), '2017-04-14 00:00:00';. PostgreSQL provides a number of functions that return values related to the current date and time. Follow. The field determines which date/time part will be extracted/pulled out from the given source. The subtraction of timestamps yields an interval. 4 Example1 Answer. +01 +02 etc depends on your time locale's daylight saving rules. 5. 8. Postgres, Update TIMESTAMP to current date but. with ats (old_tz) as (select now() ) select old_tz, '2015-12-31'::timestamptz + (old_tz - date_trunc('day', old_tz)) new_tz from ats; OOPS. field selects to which precision to truncate the time stamp value. 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):I think the :: operator is more common in "Postgres land". 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. I will get the same. I have to convert a postgres query to Sequelize query. date_trunc() Examples. Luckily, Postgres has functional indexes, and this fit the bill perfectly - we needed to index the request_time column in the display time zone. SELECT CODE, to_char (DATE, 'YYYY-MM'), count (CODE) FROM employee where group by CODE, to_char (DATE, 'YYYY-MM') Depending on whether you want the result as text or a date, you can also write it like this: SELECT CODE, date_trunc ('month', DATE), COUNT (*) FROM employee GROUP BY CODE, date_trunc ('month', DATE); Which in your. , hour, week, or month and returns the truncated timestamp or interval with a level of precision. We had discussed about the Date/Time data types in the chapter Data Types. date_trunc('hour', timestamp '2001-02-16 20:38:40') → 2001-02-16 20:00:00. 5. 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. Current Date/Time. To extract the century from a given date/time value, you can use the extract() function with the "century" field. 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. date_trunc関数. orm: dql: datetime_functions: date_trunc: YOUR_BUNDLE_HEREDoctrineExtensionsDateTrunc. PostgreSQL dynamic date_trunc function rounding up exactly to given timestamp. 2 do mention both forms though. date AT TIME ZONE 'UTC'))? I need to be rounding down to full days (and weeks, etc. But the week starts on Monday in Postgres by default. The TRUNC function has the signature:. ). With PostgreSQL there are a number of date/time functions available, see here. In PostgreSQL, DATE_TRUNC Function is used to truncate a timestamp type or interval type with specific and high level of precision. You obviously got my point, because you added a remark to your answer that they should use a date column for the month. , week, month, and year. (Values of type date and time are cast. Date_Trunc varies parts of the date/time: century, year, month, day, hour, minute, second, millisecond,. convert time to decimal data type in PostgreSQL. It will return the date truncated to month precision, e. 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. Data granularity measures the level of detail in a data structure. - It retrieves the trimmed part with a specific precision level. 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. callsign FROM tvh_aircraft. 0. For instance, the “BETWEEN” clause, the “DATE_TRUNC()” function, and the basic comparison operators like “=”, “!=”, “>=” etc. The function date_trunc is conceptually similar to the trunc function for numbers. g. E. 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. Truncate date in units other than default choices using date_trunc (Postgres 9. This query ran fine previously and on an interesting note, if I change the DB to Postgres 12, 13 or 14 the query also executes as expected. postgres sql, date_trunc without extra zeroes. Trunc date field in mysql like Oracle. Date/Time Functions and Operators. These SQL-standard functions all return values based on the start. To get a rounded result, add 30 seconds to the timestamp first, for example: select date_trunc('minute', now() + interval '30 second') This returns the nearest minute. Truncation means setting specific parts of the date or time to zero or a default value while keeping the more significant parts unchanged. If you want a date/time value (=timestamp) where the time part is 00:00:00 then you can use current_date::timestamp or date_trunc('day', current_timestamp). Hot Network QuestionsPostgres offers several date-time functions to deal with temporal data. 0. Last updated at 2013-05-31 Posted at 2013-05-31. As you don't want to include rows from "this" month, you also need to add a condition for that. Introduction to the PostgreSQL DATE_PART function. 「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、. In time-series analysis, the granularity could be on intervals of years, quarters, months, weeks, days, or hours. The DATE_TRUNC () function in Postgres truncate a date or time value to a specific precision. If you want to take the current date as the first argument, you can use the following form of the AGE() function: AGE(timestamp); Code language: SQL (Structured Query Language) (sql) For example, if someone has a birth date2000-01-01 and the current date is 2017-03-20, his/her age will be:We are using date_trunc, group by, and aggregate functions to retrieve table data as per day basis in PostgreSQL, we are using date_trunc function on the column from which we are retrieving data as per day basis. I'm a little confused about using trunc() function in postgresql. Or simpler, use the column number: group by 1 (if the expression is the first column in the select clause). 7. PostgreSQL Version: 9. 2: date_trunc('hour', timestamp '2001-02-16 20:38:40') 2001-02-16 20:00:00. Functions but this works for my case. How to use the date_trunc function for biweekly grouping. Viewed 11k times 9 This is an excerpt from my sql query. 0, PostgreSQL 8. 082224') GROUP BY date (updated_at) ORDER BY count (updated_at) DESC -- this line changed! Now you are. date_trunc(text, timestamp) timestamp: Truncate to specified precision; see Section 9. Date_trunc by month? Postgresql. 3. Now, Let us create index BTREE index on the created_at column. EXTRACT (MONTH FROM input) AS "Month". このクエリを実行すると以下の結果が得られる。. PostgreSQL provides the extract function to get a date's year and week number according to the ISO 8601 standard, which has the first week of every year containing January 4th. However we know that date_trunc('month', mydate)::date is safe because it. Improve this answer. 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_PART() function extracts a subfield from a date or time value. I am just highlighting the date modification part) ## 6 days interval "date_trunc ('month', created_at) + (date_part ('day', created_at)::int - 1) / 6 * interval '6 day'" ## 10 min interval "date_trunc ('hour', created_at) + date_part ('minute', created_at)::int / 10 * interval '10 min'". But I found that there's a trunc() function in pg_catalog. Related: PostgreSQL: between with datetime2,521 20 21. x: CriteriaBuilder cb = entityManager. 2: date_trunc('hour', timestamp '2001-02-16 20:38:40') 2001-02-16 20:00:00:. Trimming trailing :00 from output after date_trunc. 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. Subtract one month from the current month, then "truncate" that to the beginning of that date. timestamp)) from rollup_days as rp; To convert the timestamp back to a bigint, use extract () Select date_trunc('week',dateTime) Date_week, Max(Ranking) Runing_Total_ID from (select datetime, id , dense_rank over (order by datetime) as Ranking from Table1) group by 1 This query is working for me to give me the running total of total IDs by week. 2, PostgreSQL 9. 662522'); date_trunc --------------------- 2022-05-16 12:00:00. DATE_TRUNC: TIMESTAMP first day of year + current week * 7 days = closest preceding date with same day of week as the first day of the year. The day (of the month) field (1 - 31). Share. Postgres has lots of functions for interval and overlap so you can look at data that intersects. In PostgreSQL, DATE_TRUNC Function is used to truncate a timestamp type or interval type with specific and high level of precision. Test. The day (of the month) field (1 - 31). If you want to know how many seconds passed since Jan. Very unlikely to change though. When storing a date value, PostgreSQL uses the yyyy-mm-dd format e. The date part to which to truncate the timestamp value. The DATE_PART() function extracts a subfield from a date or time value. Date_trunc function timestamp truncated to a specific precision. start_date) <= DATE_TRUNC ('day', q. The. demo:db<>fiddle. 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. 2) and found the date_trunc function extremely useful for easily matching time stamps between certain days/months/etc. to the beginning of the month, year or hour. Share. For example. 1 min read. 7) PostgreSQL Now (): Display without milliseconds. In this case, PostgreSQL decided to launch two parallel workers and the overall query performance improved almost 1. I've tried the. g. ) from a date or time. 1. 9. Current Date/Time. What could be going wrong here. The time zone is variable. Yes, that is how you use date_trunc. org> Reviewed-by: Isaac Morland <isaac. In PostgreSQL, DATE_TRUNC () is a built-in date function that truncates/trims the unnecessary part from the date/time. Follow answered Feb 26, 2018 at 23:30. Sorted by: 5. date_trunc(text, timestamp) timestamp: Truncate to specified precision; see also Section 9. In PostgreSQL, the DATE_BIN() function enables us to “bin” a timestamp into a given interval aligned with a specific origin. Its Java equivalent is: Instant. 2. Postgresql date_trunc function. In this case I use the now() function to return the current date, and the 'month' argument modifies that date to the beginning of. 0. 指定した単位（month）以下の値が切り捨てられ、 年 月という結果. Finally… The date_bin function is adaptable and offers many new features on top of what PostgreSQL already has to offer. , date/time types) we describe the actual behavior in subsequent sections. select date_trunc('minute', now()) Edit: This truncates to the most recent minute. This function truncates a date/time value to a specified precision. g. I'm not sure what equivalent are you looking for, but: there is no nanosecond precision in PostgreSQL: The allowed range of p (precision) is from 0 to 6 for the timestamp and interval types. The second is more concise, but Postgres-specific. Improve this answer. 1994-10-27. If I use it like ths: select trunc(now(),'MM'). Sorted by: 3. The date_trunc function truncates a TIMESTAMP or an INTERVAL value based on a specified date part e. The function date_trunc is conceptually similar to the trunc function for numbers. 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. 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. To get week start and end date (as 0 for Monday and 4 for Friday): select cast (date_trunc ('week', current_date) as date) + 0 || '-->' || cast (date_trunc ('week', current_date) as date) + 4; 2015-08-17-->2015-08-21. Users can add new types to PostgreSQL using the CREATE TYPE command. This list of the. In PostgreSQL, the date_trunc() function truncates a date/time value to a specified precision. The range of values for date values in PostgreSQL is 4713 BC to 5874897 AD. date; The results:SELECT date_trunc('month', now()); Result: 2022-04-01 00:00:00+10. 0. This uses PostgreSQL’s date_trunc () function, along with some date arithmetic to return the results we want. The trunc function can be used in the following versions of PostgreSQL: PostgreSQL 9. to the beginning of the month, year or hour. select interval_date_trunc(interval '6 hours', start_date) as running_6h, count(*) from t group by running_6h; The function can be used in other cases of running interval aggregation too. postgresql error: function date_trunc(unknown, text) does not exist LINE 1: SELECT DATE_TRUNC('day', "Date") AS __timestamp, ^ HINT: No function matches the given name and argument types. The TRUNC() function accepts two arguments. PostgreSQL provides a number of functions that return values related to the current date and time. 0. AT TIME ZONE 9. Sorted by: 3. However, date_trunc('day', created) is not equivalent to the other expressions, because it returns a timestamp value, not a date. 7. EXTRACT. 6. These SQL-standard functions all return values based on. 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. , work with Date objects directly and not use date_trunc. There is no function you want, but as said in postgresql wiki you can define function for youself: CREATE OR REPLACE FUNCTION round_time_10m (TIMESTAMP WITH TIME ZONE) RETURNS TIMESTAMP WITH TIME ZONE AS $$ SELECT date_trunc ('hour', $1) + INTERVAL '10 min' * ROUND (date_part ('minute', $1) / 10. Current Date/Time. create index CONCURRENTLY idx_test2 on tmp_table using btree (skyid, date_trunc('day', create_time), actiontype ); –Saeeds answer is correct. 32 shows the available functions for date/time value processing, with details appearing in the following subsections. In most databases, you can do this by converting to a date: select cast (time as date) as dte, sum (case when status = 1 then 1 else 0 end) as num_successful from t group by cast (time as date) order by dte; This assumes that 1 means "successful". Introduction to the PostgreSQL date_trunc function. 22 Documentation. now (). Use the PostgreSQL AGE () function to retrieve the interval between two timestamps or dates. Table 9. 600 is 10 minutes in seconds. SELECT date_trunc($1, purchase_date) unit_of_time, SUM(total) FROM orders WHERE purchase_date >= $2 AND purchase_date <= $3 GROUP BY unit_of_time ORDER BY unit_time; [interval, startDate, endDate] The above query works correctly for when I pass in either 'month' or 'day' as the interval variable, but gives incorrect values. I want something in between like 100 milliseconds (1/10 second). SELECT CODE, to_char (DATE, 'YYYY-MM'), count (CODE) FROM employee where group by CODE, to_char (DATE, 'YYYY-MM') Depending on whether you want the result as text or a date, you can also write it like this: SELECT CODE, date_trunc ('month', DATE), COUNT (*) FROM employee GROUP BY CODE, date_trunc ('month', DATE);. This function takes two arguments: the first is the end date and the second is the start date. 0 did not follow the conventional numbering of millennia, but just returned the year field divided by 1000. Finding events relative to the present time with NOW () and CURRENT_DATE functions. 2. 2. But there is also no point in casting date literals to date as input parameter. 2. 9. extract() complies with the SQL standard, date_part() is a Postgres specific query. 2 Answers. If the value is negative, the parts are counted backward from the end of the string. 2: date_trunc('hour', timestamp '2001-02-16 20:38:40') 2001-02-16 20:00:00. You could think of it as a date version of the trunc() function (which truncates numbers). For this purpose, specify the “MONTH” as the first argument to any of the functions mentioned above and then use the GROUP BY clause. 9. 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. The function date_trunc is conceptually similar to the trunc function for numbers. RTRIM. The date part to which to truncate the timestamp value. CREATE TABLE log ( log_id SERIAL PRIMARY KEY, message VARCHAR ( 255) NOT NULL , created_at TIME DEFAULT. datepart. You can use the Now () function in PostgreSQL to display the current date and time without any mention of milliseconds. date_trunc ( field, source [, time_zone ]) source is a value expression of type timestamp, timestamp with time zone, or interval. See Postgres Date/Time Functions and Operators for more infoIn PostgreSQL, the DATE_TRUNC function is used to truncate a date, time, or timestamp value to a specified precision. These SQL-standard functions all return values based on. ). performance. How to update a part of a timestamp field in postgres? 0. It takes a date part (like a decade, year, month, etc. It takes a date part (like a decade, year, month, etc. date) AND DATE_TRUNC ('day', c. POSTGRESQL Course Bundle - 5 Courses in 1 | 1 Mock Test. extract will interpret such a time stamp in your current time zone (it does not know about the second. A bigint is not "a timestamp", so you must convert the number to a date before you can apply date_trunc () on it: Select date_trunc ('day', to_timestamp (rp. milliseconds. I just want to point out that it is often convenient to leave the value as a date. Using column::timestampt (0) may lead to unexpected rounding up column value. 2. values date_trunc ('MONTH', DATE ('2007-02-18')) Result: 2007-02-01 00:00:00. Well, In postgres, it seems there's no such function equivalent to LAST_DAY() available in oracle. century. The query looks like this: SELECT COUNT (*), EXTRACT (HOUR FROM paid_at) AS HOUR FROM transactions WHERE paid_at >= '2015-01-01 00:00:00' AND paid_at <= '2015-01-31. - Return Type: TIMESTAMP. It is is IMMUTABLE (for timestamp without time zone). What is the JPQL/JPA/Hibernate equivalent of the database function date_trunc('day', (entity. day. getCriteriaBuilder (); CriteriaQuery<Date> query = cb. The time zone in result is shifted by 1hr: select date_trunc('year','2016-08-05 04:01:58. Oct 27, 2013 at 12:41. date_trunc(text, timestamp) timestamp: Truncate to specified precision; see also Section 9. In MySQL, there is no such function available to round the date and time to the interval you. You may be misunderstanding what date_trunc does. Use the below command: SELECT date_trunc ('week', timestamp'2021-08-23 19:14:20'); Postgresql date_trunc week. So instead of having. date_trunc('datepart', field) The datepart can be day, second, month, and so on. However, DATE_TRUNC with the ISOYEAR date part truncates the date_expression to the beginning of the ISO year, not the Gregorian calendar year. PostgreSQL: Documentation: 9. This function with datetime or string argument is deprecated, use DATE_TRUNC instead. date_created) )AS DAY, this is my output 2013-02-04. Input Format: Dates in yellow are the dates to aggregate sales on. But the start day is coming as Monday. *, (first_week + ( (date - first_week::date) / 14)*14 * interval '1 day')::date as biweek from (select t. This is an excerpt from my sql query. Improve this answer. 15. On 29/10/2018 16:26, Andreas Karlsson wrote: > On 10/29/2018 04:18 PM, Vik Fearing wrote: >> A use case that I see quite a lot of is needing to do reports and other >> calculations on data per day/hour/etc but in the user's time zone. 2. 9.