Functions and Operators. transaction_date) but the count (distinct) will do a sort so it will take you a lot of time. Here’s a bit of code adapted from the PostgreSQL wiki that I like for creating the ever necessary date dimension in PostgreSQL. Thank you so much, Mr @GordonLinoff!!The quarter of the year (1–4) that the date is in SELECT EXTRACT(QUARTER FROM TIMESTAMP '2001-02-16 20:38:40'); Result: 1. Postgres では、 DATE_TRUNC () には次の間隔. 9. I have this problem. Use the below command: SELECT date_trunc ('week', timestamp'2021-08-23 19:14:20'); Postgresql date_trunc week. Column [source] ¶ Returns timestamp truncated to the unit specified by the format. Chapter 9. 1 Answer. The quarter of the year (1 - 4) that the date is in SELECT EXTRACT(QUARTER FROM TIMESTAMP '2001-02-16 20:38:40'); Result: 1. date_trunc always returns a timestamp, not a date. g. Checkout DoctrineExtensions. In the above query within the date_part() function, provided the two values, the unit or the component ‘hour’ and the CURRENT_TIMESTAMP function that returns the current time your system. The time zone. and source is the date. If the contraint should apply to the tservice as type "date" you might as well create the tservice column as type "date" instead. if you want timestamp instead of timestamptz cast the date to timestamp first. 9. If I use the below query, I get the result as 0. It shows a similar result, converting the date to a month and year value, which changes the day to the first of that month. 5. This is one way to go about it. ) field selects to which precision to truncate the input value. It is only meant as a quick reference to those I use most often. Stack Overflow. We need the calendar quarter. So if I run the SQL now, it should give me sep 30 2012. 2. date_trunc¶ pyspark. 32 illustrates the behaviors of the basic arithmetic operators ( +, *, etc. 1. Add a comment. . However, date_trunc('day', created) is not equivalent to the other expressions, because it returns a timestamp value, not a date. TRUNC(date, format) Code language: SQL (Structured Query Language) (sql) Arguments. g. All the functions and operators described below that take time or timestamp inputs actually come in two variants: one that takes time with time zone or timestamp with time zone, and one that takes time without time zone or timestamp without time zone. This can make date/time fields easier to read, as well as help perform cleaner time-based analyses. SELECT DATE_TRUNC('month', TIMESTAMP '2005-05-21 15:30:30'); Result: 2005-05-01 00;00:00 The basic syntax of the DATE_TRUNC function is as shown below: DATE_TRUNC(precision, source); where precision is the precision to which you want to truncate the date or time (e. g. This is utterly confusing and annoying. What I need is to "round down" the month to day one, and I. For formatting functions, refer to Section 9. That is easy enough to add. date_trunc. Truncating any date or timestamp to the month level will give you the first of the month containing that date. Table 9. shahkalpesh. Alternative option. g. SELECT date_trunc ('quarter', now()); date_trunc-----2021-01-01 00:00:00+00. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"README. date_trunc is only defined for timestamp with time zone and timestamp inputs. Its Java equivalent is:Using the connect by trick for generating numbers you can extend that to generate dates and times…. 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. The following bug has been logged online: Bug reference: 2664 Logged by: Yoshihisa Nakano Email address: nakano. A few years later I came here to find how to round a timestamp to a 6 hour interval. 8. Basically, there are two parameters we. Current Date/Time. We are also looking at upgrading to a newer version of Postgres but that is further out. This uses PostgreSQL’s date_trunc () function, along with some date arithmetic to return the results we want. First, we have the date part specifier (in our example, 'month'). - It retrieves the trimmed part with a specific precision level. for example 2018-10-15 will be 2018-10-01 and 2018-10-30 also will be 2018-10-01. SELECT DATE_TRUNC('minute', some_date) FROM some_table; This was working fine but I got to know that index made on some_date column will be futile because indexes doesn't work with DATE_TRUNC(), Index created was as follows :. region, q1. One possibility: select year * '1 year'::interval + '0000-01-01'::date; I like this way because it avoids conversion between text and integer (once all the constants are parsed). 2) and found the date_trunc function extremely useful for easily matching time stamps between certain days/months/etc. PostgreSQL has several of functions for manipulating the dates such as extracting. It takes a date part (like a decade, year, month, etc. 8. created), 'YYYY-MM-DD')) GROUP BY d. The LOCALTIME function takes one optional argument:. 2k 3 64 88. If the contraint should apply to the tservice as type "date" you might as well create the tservice column as type "date" instead. This example uses TRUNC on a date to truncate it to a day. 1 Answer. Postgres quarter function. , week, year, day, etc. 9. For example, if we want to truncate the date and time value to the nearest hour or week, it is possible to truncate using the date_trunc function. PostgreSQL uses 4 bytes to store a date value. The precision parameter is case-insensitive. But there is also no point in casting date literals to date as input parameter. In Postgresql, to truncate or extract the week of the timestamp value, pass the week as a string to the date_trunc function. In addition to these functions, the SQL OVERLAPS operator is supported: ( start1, end1 ) OVERLAPS ( start2, end2 ) ( start1, length1 ) OVERLAPS ( start2, length2 ) This expression yields true when two time periods (defined by their endpoints) overlap, false when they do not overlap. date_trunc('hour', interval '2 days 3 hours 40 minutes') 2 days 03:00:00:. date, count (se. When used to aggregate data, it allows you to find time-based trends like daily purchases or messages per second. Say,. select * from table where extract (hour from column1) in (8, 9) where cast (column1 as time) >= '8:00' and column1::time < '10:00'. PostgreSQL date_part function will allow retrieving subfields from the date and time value, e. . 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. date, q1. 9. 2 Answers. ). WW truncates date to the nearest previous day same to the first day of week of the year. 33 shows the available functions for date/time value processing, with details appearing in the following subsections. Improve this answer. dayofweek_iso 部分は、 ISO-8601データ要素と交換形式の標準に従います。 この関数は、曜日を1-7の範囲の整数値として返します。1は月曜日を表します。 他のいくつかのシステムとの互換性のために、 dayofweek 部分は UNIX 標準に従います。 この関数は、曜日を整数値として0-6の範囲で返します。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. Here is my solution adapted to the question given: SELECT DATE_TRUNC ('minute', NOW ()) - MAKE_INTERVAL (MINS => MOD (EXTRACT (MINUTE FROM NOW ())::INTEGER, 15)) Explanation: DATE_TRUNC the timestamp to. Note that the 'first day of the week' is not uniform across databases. g. The quarter of the year (1 - 4) that the date is in SELECT EXTRACT(QUARTER FROM TIMESTAMP '2001-02-16 20:38:40'); Result: 1. appointment_date::date + appointment_end_time::time. I have to convert a postgres query to Sequelize query. EXTRACT (MONTH FROM input) AS "Month". g. This can be generalized to any type of grouping. g. WHERE date_survey >= date_trunc('year', now()); Or maybe add EXTRACT('quarter' FROM date_survey) AS start_season to add the quarter number. Here are some of my staple date functions. The TRUNC() function accepts two arguments:. Here's the correct way to do it, with date_trunc: SELECT date_trunc ('month', txn_date) AS txn_month, sum (amount) as monthly_sum FROM yourtable GROUP BY txn_month. You can truncate the current date to its quarter, then remove 1 day from that (and potentially cast back to date): -- You really only need the last column, the other two just show the different steps in the process SELECT DATE_TRUNC ('quarter', CURRENT_DATE) , DATE_TRUNC ('quarter',. A) Extracting from a TIMESTAMP examples. Current Date/Time. 2020-04-01 , and has the advantage that subsequent steps in the pipeline can read it like a normal date. string_text (required): Text to be split into parts. The quarter of the year (1 - 4) that the day is in. ) field selects to which precision to truncate the input value. 9. It can be of timestamp, timestamptz, or interval type. 1. pto_start_date < (date_trunc ('quarter', now () - INTERVAL '1 month') + INTERVAL. 1+) that I've overlooked. To verify that, connect to PostgreSQL with psql and run dx to list the extensions. Possible Values. Adding a month gives you the first of the following month. , week, month, and year. Users coming from Oracle will recognize this one. 1. The date function used to truncate a date or datetime value to the start of a given unit of duration. ) Example of grouping sales from orders by month: select SUM(amount) as sales, date_trunc('month', created_at) as date from orders group by. Explained below with examples: Example 1: Fiscal Year system: Apr to Mar From Date: Jan-05-2008 To Date: May-15-2008. g. All the same can be achieved by using something such as date_trunc('week', date_time) AS date_period, to summarize by weeks instead of days, instead of the definition I used. config. Get the number of remaining days after excluding date ranges in a table. Optional. Jun 27, 2014. The date_trunc function shortens timestamps so they are easier to read. 参数 field. The function date_trunc is conceptually similar to the trunc function for numbers. The date_trunc function contains the two input parameters, i. 0) $$. Truncates a DATE, TIME, or TIMESTAMP to the specified precision. (Values of type date and time are cast automatically to timestamp or interval, respectively. The range of values for date values in PostgreSQL is 4713 BC to 5874897 AD. 1 Share Follow The DATE_TRUNC () function is used to truncate a date, time, or timestamp to a specified interval, such as the day, week, or month, in PostgreSQL and SQL Server. The date_trunc function in redshift is specifically used to truncate the specified precision. The function date_trunc is conceptually similar to the trunc function for numbers. Right now the cod. sales FROM Q1 UNION ALL SELECT q2. PostgreSQL provides a number of functions that return values related to the current date and time. Its Java equivalent is: Instant. INTERVAL '1-2' YEAR TO MONTH. The range of values for date values in PostgreSQL is 4713 BC to 5874897 AD. Adding date_trunc('quarter', your_date) to your start date will guarantee you start with the beginning of a quarter. EXTRACT, date_part. For example: Truncating a timestamp down to the quarter returns the timestamp corresponding to midnight of the first day of the quarter for the input timestamp. Isolating hour-of-day and day-of-week with EXTRACT function. Let's see: = $ SELECT date_bin ('5 minutes', now ()); ERROR: FUNCTION date_bin (UNKNOWN, TIMESTAMP WITH TIME zone) does NOT exist. Covers all your examples. Go forth and write fearless (read-only) SQL!only date_trunc(text,interval) and date_trunc(text,timestamp) are immutable. The following illustrates the. Sorted by: 3. 1. 9. date_trunc () was added in PostgreSQL 7. ). 0) $$ LANGUAGE SQL; Generally rounding up to. toLocalDateTime () When you use date_trunc ('day', now () at time zone 'Asia/Tehran') (column tehran_local_start_of_today) it indicates the start of today in Tehran local. Modified 10 years,. 9. Special calculation is needed for week/quarter. A general solution for any time interval can be based on the epoch value and integer division to truncate. These SQL-standard functions all return. These. parse_datetime(string, format) → timestamp with time zone. So if the date in the field input was 04/26/2016 this syntax returns 4,. create table foo ( first_of_month date not null check (extract (day from first_of_month) = 1) ); insert into foo (first_of_month) values ('2015-01-01. PostGreSQL : date_trunc() returns timestamp with timezone when used on date. The first removes the hours and smaller units from the timestamp, but still returns a timestamp, while the latter returns the timestamp cast to a date. 0) $$ LANGUAGE sql; Pad on the right of a string with a character to a certain length. 6. A weird way to number weeks but might be what the OP is after :) – Andomar. SQL Server: Date truncation for custom time periods. This is utterly confusing and annoying. Date_trunc function timestamp truncated to a specific precision. Gets the number of intervals between two DATE values. ). Alternatively you can use the date_trunc function: SELECT date_trunc ('day', my_date) Share. format_datetime(timestamp, format) → varchar. Almost as it can't take any interval with units of months or more (due to varying duration). SELECT cast (created_at as date) as created_at, count (created_at) FROM forms group by 1 ORDER BY created_at asc; If you want the date in a particular time zone, date_trunc with that time zone then cast to a date. PostgreSQL provides a number of functions that return values related to the current date and time. Postgres has date_trunc which operates on timestamp or interval, and:. The SELECT statement below extracts the quarter each. e. GROUP BY 1. SELECT date_trunc('MONTH', dtCol)::date; But getting the last day is not so straight forward. Introduction to the PostgreSQL DATE_PART function. Follow. SELECT id, name, date_trunc('quarter', date) AS date, AVG(rank) AS rank,. order_date BETWEEN [date_start] AND [date_end] GROUP BY interval. 0) $$ LANGUAGE sql;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. 4 or later. Note: This shows two methods of doing the conversion, the first is the standard method. 9. Formats timestamp as a string using format. WEEK: The number of the week of the year that the day is in. How to write the query to get the first and last date of a January and other month's in postgresql 1 Get the timestamp of the last and first day of a month in postgresSQLIn order to ignore seconds, you can use date_trunc () function. date_trunc (format: str, timestamp: ColumnOrName) → pyspark. Then, removing a day will give you the date of the last day of the month of the provided date. In other words we can use date_trunc for date values with a cast:. g. Date_selector >) AS ddate, SUM (value1) AS value1FROM `project. 1. Based on Fiscal Year system, duration. LastAccessDate), quarter = DATETRUNC(QUARTER,. Yes, that is how you use date_trunc. 33. sql. date_trunc(text, timestamp) timestamp: Truncate to specified precision;. I am thinking of defining variables with reference to current date. You are correct, I meant quarter, but typed month. These SQL-standard functions all return values based on the start time of the current. It's much better to materialize separate columns for the year, quarter and year-quarter from the_date column, as is suggested in one of the comments. 9. ; delimiter_text (required): Text representing the delimiter to split by. (date_trunc('quarter', day)::date + '3 months - 1 day'::interval)::date AS quarter_ends_on, null AS is_end_of_quarter, null AS days_in_quarter,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. Finally, it returns the truncated part with a specific precision level. The function date_trunc is conceptually similar to the trunc function for numbers. It is only meant as a quick reference to those I use most often. 1994-10-27. Because that’s the way it’s implemented in Postgres and DB2. PostgreSQL Date Functions (and 7 Ways to Use Them in Business Analysis). See the example below to see how you can aggregate by MONTH: SELECT SUM(number) AS total, DATE_TRUNC (date, MONTH) AS month FROM ( SELECT CAST('2021-02-04' AS DATE) AS date, 3 AS number UNION ALL ( SELECT. date_trunc() also accepts other values, for instance quarter, year etc. DATE 'YYYY- [M]M- [D]D'. The syntax of the function is as follows: DATE_TRUNC ('precision', expression); where expression is a timestamp or an interval to truncate. SELECT date_trunc. Current Date/Time. yosihisa@jp. 2. Values of type date and time are cast automatically to timestamp or interval, respectively. source must be a value expression of type timestamp, time, or interval. Here’s a bit of code adapted from the PostgreSQL wiki that I like for creating the ever necessary date dimension in PostgreSQL. PostgreSQL's date_trunc in mySQL Ask Question Asked 12 years, 7 months ago Modified 10 months ago Viewed 43k times 26 Recently, I have been getting familiar. These SQL-standard functions all return values based on the start. My SQL is: SELECT date_trunc('week', '2020-06-01'::timestamp)::date ||'-'|| (date_trunc('week', '2020-06-01'::timestamp)+ '6 days'::interval)::date; However, using. One truncates a date to the precision specified (kind of like rounding, in a way) and the other just returns a particular part of a datetime. Read: Postgresql date_trunc function Postgresql date add year. In the above output, it shows the output like a day of the timestamp value but we can find the week number. To generate a series of dates this is the optimal way: SELECT t. Like for example, I passed a date as on 12th January, 2015, I need the result to be as 4th quarter of 2014. Adds a specified time interval to a DATE value. Table 9-28 shows the available functions for date/time value processing, with details appearing in the following subsections. The full-list is available in the Postgres docs. The date is complete (year, month, and day). ) and a TIMESTAMP as parameters, and then it truncates the TIMESTAMP according to the specified date part. region, q2. 31 illustrates the behaviors of the basic arithmetic operators ( +, *, etc. DATE_TRUNC returns a date or timestamp, while DATE_PART returns a subfield from a date or timestamp. SELECT date_trunc. A função DATE_TRUNC do Postgres pode nos ajudar a “truncar” uma data, bem, mas o que isso quer dizer? É simples, ela retorna a data inicial de um intervalo. As far as I understand you want to change the day of the month to 8. If you want just the date in the current time zone, cast to a date. performance. Table 9. MONTH: For timestamp values, the number of the month within the year (1–12) ; for interval values the number of months, modulo 12 (0–11). Table 9-23 lists them. When working with dates and times in PostgreSQL, having a date calendar table can be incredibly useful. 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. RPAD (‘ABC’, 6, ‘xo’) ‘ABCxox’. 5. PostgreSQL provides a number of functions that return values related to the current date and time. All the functions and operators described below that take time or timestamp inputs actually come in two variants: one that takes time with time zone or timestamp with time zone, and one that takes time without time zone or timestamp without time zone. My current work around is to map date_trunc as a function and explicitly call it but it seems odd to have to do that. timestamp '2001-09-29 03:00' - timestamp '2001-09-27 12:00'. date_trunc('field', source) source is a value expression of type timestamp (values of type date and time are cast automatically). “Year” must be passed. Truncates a DATE value. We had discussed about the Date/Time data types in the chapter Data Types. Oracle, of course, just. A primer on working with time in Postgres. currently I am coding the exact date for the last quarter, the quarter before and the quarter one year ago. for example, in postgresql. For. The real value returned by the CURRENT_TIMESTAMP was ‘2023-06-17. select to_char (date_trunc ('month', l. , hour, week, or month and returns the truncated timestamp or interval with a level of precision. Connect and share knowledge within a single location that is structured and easy to search. From the documentation: date_part (): The date_part function is modeled on the traditional Ingres equivalent to the SQL-standard function extract:Into something like: SELECT COUNT (*) = 1 INTO v_exists FROM pg_tables WHERE schemaname = 'public' AND tablename = v_partition_name and v_date_from < date_trunc ('year', current_date); This will return 1 only in the case when partition is from previous year. , ‘year’, ‘quarter’, ‘month’, ‘day’, ‘hour’, ‘minute’, ‘second’, etc. This macro splits a string of text using the supplied delimiter and returns the. RPAD (‘ABC’, 6, ‘xo’) ‘ABCxox’. This query is working for me to give me the running total of total IDs by week. 4. Avg; Sum; Count; Min; Max; The below example shows that we are using an aggregate function. SELECT current_date + cast (abs (extract (dow FROM current_date) - 7) + 1 AS int); works, although there might be more elegant ways of doing it. Now, let us see the Date/Time operators and Functions. and while the condition is > '2018-10-01' then all dates in the month October will not be shown in the result. 1. (. GitHub Gist: instantly share code, notes, and snippets. 2. Table 9. 963179 secs juin 2, 2022, 12:00 AM | 0 years 0 mons 0 days 0 hours 2 mi. The following table lists the behaviors of the basic arithmetic operators −. date_created)::date, 'Month YYYY') as "Month / Year", count (distinct l. 9. The DATE_TRUNC function is useful when. What I want instead is a function that takes three parameters, so I could do make_date(2000, 1, 2) and use integers instead of strings, and returns a date (not a string). I've tried a few ways in my controller:Because I have a table that contains time without time zone. 9. Note: In PostgreSQL, the EXTRACT() and DATE_TRUNC() functions can also be used to group the table’s data based on a specific year. Date Dimension for Postgres. SELECT date_trunc('year', TIMESTAMP '2022-05-16 12:41:13. (Values of type date and time are cast automatically to timestamp or interval, respectively. date_trunc ('hour', created) + extract (minute from created)::int / 15 * interval '15' minute. Table 9. 摘要：本教程向您展示如何使用 PostgreSQL 的date_trunc()函数，将时间戳或间隔值截断到指定的精度级别。 PostgreSQL date_trunc 函数简介. century. For example, decade 201 spans from 2000-01-01 to. Postgres has lots of functions for interval and overlap so you can look at data that intersects. Assuming data type timestamp. The following bug has been logged online: Bug reference: 2664 Logged by: Yoshihisa Nakano Email address: nakano. How to truncate date in PostgreSQL? Ask Question Asked 10 years, 2 months ago Modified 10 years, 2 months ago Viewed 42k times 22 I'm trying to select all transactions in PostgreSQL 9 that happened earlier than the end of the last week. Well, In postgres, it seems there's no such function equivalent to LAST_DAY() available in oracle. so you can distinct it first in the table then do the count. Interprets an INT64 expression as the number of days since 1970-01-01. decade. decade. For a more comprehensive guide. source must be a value expression of type timestamp, time, or interval. For example, because the common calendar starts from the year 1, the first decade (decade 1) is 0001-01-01 through 0009-12-31, and the second decade (decade 2) is 0010-01-01 through 0019-12-31. The PostgreSQL formatting functions provide a powerful set of tools for converting various data types (date/time, integer, floating point, numeric) to formatted strings and for converting from formatted strings to specific data types. +01 +02 etc depends on your time locale's daylight saving rules. It puts that value in. 9. Table 9. EXTRACT (field FROM source) The extract function retrieves subfields such as year or hour from date/time values. The DATE_TRUNC () function in Postgres truncate a date or time value to a specific precision. ) field is an identifier or string that selects what field to. Note that the latter. date_trunc (field, source [, time_zone ]) source is a value expression of type timestamp, timestamp with time zone, or interval. The range of DATE datatype is from 4713 BC to 5874897 AD. The quarter of the year (1–4) that the date is in. Same as YEAROFWEEK, except uses ISO semantics. You can readily convert them to the format you want, get the difference between two values, and so on. Thanks, -Lars On Thu, 20 Jul 2000, Tom Lane wrote: > Lars. It takes the date part ‘qtr’ from the timestamp value in the “created_at” column (from the “shopify_orders” table). I am using PostgreSQL 9. 11. Here's an example: SELECT round (date_trunc ( 'day', your_date_column):: date) AS rounded_date FROM your_table; In this example, replace your_date_column with the actual name of the column that contains the date you want to round, and your_table with the name of the table where the column resides. The trunc () function is a mathematical function present in PostgreSQL. 24')); Result: 2017-02-14 20:00:00. 10. The DATE type in PostgreSQL can store a date without an associated time value: PostgreSQL uses 4 bytes to store a date value. dataset. This converts the date column my_date to date (cuts the time part) and if you cast it back into timestamp it gets the 0 time. Share. Now, let us see the Date/Time operators and Functions. PostgreSQL DATE_PART () function is mainly used to return the part of the date and time; the date_part function in PostgreSQL will subtract the subfield from the date and time value. 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. fujitsu. date_trunc('hour', interval '2 days 3 hours 40 minutes') 2 days 03:00:00:. For example, if we want just the month from the date 12/10/2018, we would get December (12). PostgreSQL 13. A function for truncating a time value to a specified unit. Add a comment. date_trunc. 1) date The date argument is a DATE value or an expression. note: similar question as DATE lookup table (1990/01/01:2041/12/31). 2. date_trunc | 2020-07-01 03:00:00+10 date_trunc | 2020-07-01 02:00:00+10 The local timezone when I ran these examples was Australia/Brisbane. PostgreSQL provides a number of functions that return values related to the current date and 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. (Values of type date and time are cast automatically to timestamp or interval, respectively. Syntax. Do this even for a single day—e. ) as we did for the EXTRACT code. 28 shows the available functions for date/time value processing, with details appearing in the following subsections. 2017) YEAROFWEEK [1] Year that the extracted week belongs to. 2. (. SELECT date_trunc('week', date::date) AS "weekly", COUNT(DISTINCT(date)) AS "working_days" FROM "public". The following are valid field names.