created_at)) day when @timeinterval = 'year' then makedate (year (u. Recently, I have been getting familiar with PostgreSQL(using 8. Table 9-27 illustrates the behaviors of the basic arithmetic operators ( +, *, etc. E. created_at as timestamp) So your final query should be something like: SELECT (date_trunc ('day', CAST (transactions. select date_trunc ('minute', created_at), -- or hour, day, week, month, year count(1) from users group by 1. UPPER関数 大文字に変換する. If you want both quarter and year you can use date_trunc: SELECT date_trunc ('quarter', published_date) AS quarter. date_created) )AS DAY, this is my output 2013-02-04 00:00:00+00. ) field selects 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. 3. PostgresSQL - the date works weird. Truncation means setting specific parts of the date or time to zero or a default value while keeping the more significant parts unchanged. date_trunc(text, timestamp) timestamp: Truncate to specified precision; see Section 9. 3. In existing versions of Postgres, you can use arithmetic: select t. callsign. DATE_TRUNC (‘ [interval]’, time_column) The time_column is the database column that contains the timestamp you'd like to round, and [interval] dictates your desired precision level. ISFINITE. This may be a bit sub-optimal, but it works. select to_char (date_trunc ('month', l. The basic syntax of the DATE_TRUNC function is as shown below:. You might need to add explicit type casts. I'm trying to create what should be a super simple line chart showing the avg annual. 当然PostgreSQl 也有大量的时间函数,详情请移步postgresql时间日期函数总结. PostGreSQL : date_trunc() returns timestamp with timezone when used on date. The precision values are a subset of the field identifiers that can be used with the EXTRACT() and DATE_PART() functions. Share. Table 9-20 lists them. The TRUNC() function accepts two arguments. The function date_trunc is conceptually similar to the trunc function for numbers. Gordon Linoff went further in his. Syntax. source is a value expression of type timestamp or interval. Current Date/Time. date_trunc(text, timestamp) timestamp: Truncate to specified precision; see also Section 9. postgres sql, date_trunc without extra zeroes. select to_char(calldate,'Day') as Day, date_trunc(calldate) as transdate, Onnet' as destination,ceil(sum(callduration::integer/60) )as total_minutes,round(sum(alltaxcost::integer) ,2)as revenue from cdr_data where callclass ='008' and callsubclass='001' and callduration::integer >0 and. Use the below command: SELECT date_trunc ('week', timestamp'2021-08-23 19:14:20'); Postgresql date_trunc week. (Values of type date and time are cast automatically to timestamp or interval, respectively. A more specific answer is: where generated_time >= date_trunc ('hour', current_timestamp) and generated_time < date_trunc ('hour', current_timestamp) + interval '1 hour'. The second one which use DATE_TRUNC will tranc any date to the first day of the month. For types without standard mathematical conventions (e. The second is more concise, but Postgres-specific. created), 'YYYY-MM-DD')) GROUP BY d. gradovenko mentioned this issue on Dec 7, 2021. The time zone in result is shifted by 1hr: select date_trunc('year','2016-08-05 04:01:58. date_trunc is only defined for timestamp with time zone and timestamp inputs. PostgreSQL dynamic date_trunc function rounding up exactly to given timestamp. Sorted by: 3. for example 2018-10-15 will be 2018-10-01 and 2018-10-30 also will be 2018-10-01. PostgreSQL provides a number of functions that return values related to the current date and time. g. PostgreSQL provides a number of functions that return values related to the current date and time. ). 5. Connect and share knowledge within a single location that is structured and easy to search. PostgreSQL provides two very similar functions DATE_PART and EXTRACT with different syntax, but identical (DATE_PART returns a double, which can lead to some loss of precision) behavior. date_created <= { {date_range_end. In Oracle, the MET time zone is DST aware and the UTC offset is +02:00:00. In fact extract() gets re-written to date_part() - check the execution plan and you will see. With the above query I get the information I want, but I have to change the date every day. 0. Both are b-tree indexable operations. g. In PostgreSQL, the DATE_TRUNC function is used to truncate a date, time, or timestamp value to a specified precision. This can be handy when we want to truncate a timestamp to a given interval, for example a 10 minute interval. The function date_trunc is conceptually similar to the trunc function for numbers. 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. Code: SELECT TRUNC(67. Hot Network Questions Shuffling two lists into each other Modeling a pure dipole as a function similar to a Dirac delta function Depressing story where SETI received signals from deep space but this news was suppressed Why is an internal proof of consistency. Does date_trunc automatically work on current year when used with CURRENT_DATE? Yes, date_trunc('month', CURRENT_DATE) will truncate the current date. The date_trunc() function in PostgreSQL is used to truncate a timestamp or interval value to a specified unit. What is the fastest way to truncate timestamps to 5 minutes in Postgres? Postgres 13 or older SELECT date_trunc('hour', date1) AS hour_stump , (extract(minute FROM date1)::int / 5) AS min5_slot , count(*) FROM table1 GROUP BY 1, 2 ORDER BY 1, 2; You could GROUP BY two columns: a timestamp truncated to the hour and a 5-minute-slot. 说明：DATE_TRUNC 函数根据您指定的日期部分（如小时、周或月）截断时间戳表达式或文本。DATE_TRUNC 返回指定的年的第一天、指定的月的第一天或指定的周的星期一。. Issue in creating a function in PostgreSQL using date_trunc. It's best explained by example: date_trunc('hour',TIMESTAMP '2001-02. decade. SELECT date_trunc('week', received_at) AS query_week, COUNT(DISTINCT customer_id) AS. This is an excerpt from my sql query. It can be used with or without time zone, and it can be used with different data types such as date, time, or interval. ) field selects to which precision to truncate the input value. 2: date_trunc('hour', timestamp '2001-02-16 20:38:40') 2001-02-16 20:00:00. For formatting functions, refer to Section 9. trunc () will set that to 00:00:00 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). ADVERTISEMENT. A similar functionality provides the Oracle compatible function TRUNC [ATE] (datetime). +01 +02 etc depends on your time locale's daylight saving rules. Instead, you should use to_char to format the date when you query it, or format it in the client application. I have searched and found. 4 shows the mathematical operators that are available for the standard numeric types. 1) 2. For example I need to get number of sales each week. I am wondering if it's possible to truncate dates other than using the default choices using date_trunc. It is worth noting that the function list (table 9-27) doesn't mention date_trunc(text, interval) form of date_trunc, it only lists the date_trunc(text, timestamp) version. Take two easy steps to create date_trunc: Break down the datetime into small parts (Year, Month, Day/Hour, Minute, Second) and extract the parts you need. You need a similar time function in PostgreSQL. 2020-04-01, and has the advantage that subsequent steps in the pipeline can read it like a normal date. trunc() will set that to 00:00:00. 2. 日付や時刻を指定のところ（精度といいます）で切り捨てるには、 date_trunc関数 を使います。. This function truncates a date/time value to a specified precision. sql. 30 shows the available functions for date/time value processing, with details appearing in the following subsections. Select Query SELECT (date_trunc('MONTH', now()) + INTERVAL '1 MONTH -. 5. The query will return a result with a single column labeled “uptime” that represents the duration of the PostgreSQL database server’s uptime. 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. Forgive me if I am oversimplifying your question, but wouldn't a simple cast and date_trunc do the trick? SELECT date_trunc('second','2022-06-15T08:27:00. It's not immutable because it depends on the sessions time zone setting. PostgreSQL is a powerful database and includes various functions for managing timestamps and date times. PostgreSQL's date_trunc in mySQL. 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). Checkout DoctrineExtensions. date_trunc ( text, timestamp) → timestamp. RTRIM (‘abcxxzx’, ‘xyz’) ‘abc’. Table 9. 2. Simply try. 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. SELECT * FROM. 5. The result is 03 records. PostgreSQL Version: 9. 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. ) field selects to which precision to truncate the input value. If you had a date and you wanted to truncate it to the hour, you could use: date_trunc ('hour', date) If you wanted to truncate to the day, you could use this: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. SELECT date_trunc('day', loggedin) AS "Day" , count(*) AS "No. Extract year from postgres date. SharePostgreSQL offers various built-in functions to group data by time, such as the DATE_TRUNC(), EXTRACT(), and DATE_PART() functions. date_trunc('hour', timestamp '2001-02-16 20:38:40') → 2001-02-16 20:00:00. Table 9. date_trunc always returns a timestamp, not a date. Note that the latter returns a timestamp with time zone, not a timestamp value. Alternatively, create a function in postgres date_trunc_day(timestamp) that calls date_trunc('day', timestamp) and call the new function instead. DATE_TRUNC('datepart', timestamp) Arguments. 000000 as a valid time, while a day for LocalTime or OffsetTime maxes out at the preceding nanosecond. 4 or later. 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. "PositionReport" WHERE "PositionReport". 5w次，点赞19次，收藏139次。摘要:Oracle有大量的日期函数可供使用,trunc, new_time,months_between,next_day,last_day,add_months,round等函数. Say, you can truncate it to the nearest minute, hour, day, month, etc. The DATE_TRUNC () function is particularly useful for time series analysis to understand how a value changes over time. That truncates the date according to the timezone of the (Grafana) client resp. Also avoids misunderstandings general communication. 8. PostgreSQL provides a number of functions that return values related to the current date and time. Note that the specifier is a string and needs to be enclosed in quotes. day. So I have dates in a column for everyday with corresponding sales and I want to accumulate the sales for a week over a single date (say Friday). What. The syntax of the function is as follows: DATE_TRUNC ('precision', expression); where expression is a timestamp or an interval to truncate. table t Returns. postgresql date_trunc to arbitrary precision? 1. Connect and share knowledge within a single location that is structured and easy to search. I've tried a few ways in my controller:SELECT date_trunc('month', now()); Result: 2022-04-01 00:00:00+10. I can't believe the accepted answer has so many upvotes -- it's a horrible method. 9. These functions all follow a common calling convention: the first argument is the value to be. date_trunc. You obviously got my point, because you added a remark to your answer that they should use a date column for the month. Viewed 1k times 0 Context: I have a dataset in Superset of parts - item ids, order year, avg annual cost. 1 Answer. select extract (isoyear from current_date); select extract (week from current_date); But there seems to be no inverse. How add integer variable in the date_trunc. 03. century. When storing a date value, PostgreSQL uses the yyyy-mm-dd format e. 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. 次のように実例を示すとわかりやすいです。. I need it to return april 22. Pictorial Presentation of PostgreSQL DATE_PART() function. Getting the first day is easy and can be done with date_trunc. The most frequently used Postgres date functions and business scenarios where they come in handy: Rounding off timestamps with DATE_TRUNC function. date_part(text, interval) double precision: 获取子域(等效于extract)； date_part('month', interval '2 years 3 months') 3: date_trunc(text, timestamp) timestamp: 截断成指定的精度； date_trunc('hour', timestamp '2001-02-16 20:38:40') 2001-02-16 20:00:00: date_trunc(text, interval) interval: 截取指定的精度， We have used the date_trunc function with the where clause to compare the date in PostgreSQL as follows. The following table lists the behaviors of the basic arithmetic operators −. Yes, I believe that's the case. 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. e. 1 Answer Sorted by: 2 They both do very different things. Postgres, Update TIMESTAMP to current date but. date_trunc(text, timestamp) timestamp: Truncate to specified precision; see also Section 9. 4. Learn more about TeamsExample 3: PostgreSQL TRUNC() function. 4 Answers. 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. 9. 例1：now()=2023-04-18 00:00:00. the postgres server timezone. Is that what you want?GROUP BY date_trunc('day', datelocal) ORDER BY date_trunc('day', datelocal); A bit more noisy code, but faster (and possibly easier to optimize for the query planner, too). The date_trunc function truncates a TIMESTAMP or an INTERVAL value based on a specified date part e. The difference between them is that the latter returns the same data type like timestamptz keeping your time zone intact. date_trunc (field, source [, time_zone ]) source is a value expression of type timestamp, timestamp with time zone, or interval. E. We had discussed about the Date/Time data types in the chapter Data Types. date=to_char (date_trunc ('day', se. Multiplying back effectively rounds down, achieving the same as. For formatting functions, refer to Section 9. 在这个示例中，我们将日期列中的年份和月份分别截取为year和month，然后使用date_trunc. These functions all follow a common calling convention. maybe the -interval '1 day' changes the class so it is printed as a datetime instead of a date). demo:db<>fiddle. However, date_trunc('day', created) is not equivalent to the other expressions, because it returns a timestamp value, not a date. SELECT DATE_PART ('days', DATE_TRUNC ('month', NOW ()) + '1 MONTH'::INTERVAL - '1 DAY'::INTERVAL ) Substitute NOW () with any other date. Table 9. Modified 10 years, 9 months ago. PostgreSQL 如何在postgres中截取日期 在本文中，我们将介绍如何使用PostgreSQL数据库中的函数和操作符来截取日期。 阅读更多：PostgreSQL 教程 1. If you prefer to write standard SQL, stick to extract(). 4. Syntax. I am using PostgreSQL 9. The date_trunc function truncates a TIMESTAMP or an INTERVAL value based on a specified date part e. Functions and Operators. MessageText: function date_trunc(unknown, timestamp with time zone, unknown) does not exist Hint: No function matches the given name and argument types. Table 8-9. In PostgreSQL, the DATE_TRUNC () function trims unnecessary values from the date and time and returns a result with specific precision. 4. 2: date_trunc('hour', timestamp '2001-02-16 20:38:40'). The function date_trunc is conceptually similar to the trunc function for numbers. The seconds field, including fractional. PostgreSQL DATE_TRUNC by 2 Weeks. I just want to point out that it is often convenient to leave the value as a date. I can't seem to be able to translate the following query into SQLAlchemy. ). date_trunc () truncates (leaves seconds unchanged) - which is often what you really want: Note that timestamp (0) and timestamptz (0) will round rather than truncate. date_trunc. SELECT date_trunc ( 'day', to_timestamp (requests. Based on the parts extracted, create a new datetime. It's not immutable because it depends on the sessions time zone setting. 3 . On the other hand you can use date_trunc function. PostgreSQL: Greatest will return the largest non-null expression, or null if all expressions are null. g. source is a value expression of type timestamp or interval. Introduction. timestamp)) from rollup_days as rp; To convert the timestamp back to a bigint, use extract () 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. , year, month, day, etc. Viewed 11k times. It's bad practice but you might be forgiven if you use. Delaying Execution. callsign FROM tvh_aircraft. PostgreSQL has the time zone name MET (UTS offset. 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. SELECT * FROM Conference WHERE date_start >= date_trunc ('month', current_date - interval '1' month) and date_start <. 2. 9. date_trunc date_trunc 関数は概念的に数値に対する trunc 関数と類似しています。 date_trunc('field', source) source はデータ型 timestamp の評価式です(データ型 date と time は自動的にキャストされます)。field は timestamp の値をどの精度で切捨てるかを選択します。返り値の. beikov February 2, 2023, 2:29pm 4. Share. Table 9. Fixes dates issues with admin for AB#12983 and. Chapter 9. 0 did not follow the conventional numbering of centuries, but just returned the year field divided by 100. This is the query: select to_char (calldate,'Day') as Day, date_trunc (calldate) as transdate, Onnet' as destination,ceil (sum (callduration::integer/60. date_trunc(text, timestamp) timestamp: Truncate to specified precision; see also Section 9. SELECT to_char (date_trunc ('month', date), 'YYYY') AS year, to_char (date_trunc ('month', date), 'Mon') AS month, to_char (date_trunc ('month', date), 'MM') AS month_number, sum (duration) AS monthly_sum FROM timesheet GROUP BY date_trunc ('month', date); From a. 662522'); date_trunc --------------------- 2022-05-16 12:00:00. I want to create an index that returns the same output as this query; --takes 2005-10-12 select date_trunc ('month',table_withdates. You can use this for PostgreSQL. PostgreSQL Version: 9. PostgreSQL: Documentation: 9. 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. Syntax: date_trunc(text, timestamp) Return Type: timestamp. date_trunc will truncate a date or timestamp to the specified date/time part. PostgreSQL provides a number of functions that return values related to the current date and time. The date_trunc function uses field either millisecond or second, but millisecond is too small for me and second too large. date_trunc¶. SELECT date_trunc('week', received_at) AS query_week, COUNT(DISTINCT customer_id) AS active_customer_count FROM activities WHERE received_at > '2023-01-01' GROUP BY 1 ORDER BY 1; Running that query will find the matching set of activities, store the result in memory, then group by iterating over the set, and iterate over the order. Current Date/Time. 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。date_trunc ( text, timestamp) → timestamp. com> Reviewed-by: Tom Lane. e. , week, year, day, etc. 9. 2. g. For this purpose, specify the “MONTH” as the first argument to any of the functions mentioned above and then use the GROUP BY clause. created_at) when @timeinterval = 'month' then u. Truncate date in units other than default choices using date_trunc (Postgres 9. Truncation means setting specific parts of the date or time to zero or a default value while keeping the more significant parts unchanged. In time-series analysis, the granularity could be on intervals of years, quarters, months, weeks, days, or hours. Syntax. How to truncate date in PostgreSQL? 4. 0. PostgreSQL: truncate hour/min/second from a timestamp. g. Finding events relative to the present time with NOW () and CURRENT_DATE functions. 2. 2: date_trunc('hour', timestamp '2001-02-16 20:38:40') 2001-02-16 20:00:00:. - It retrieves the trimmed part with a specific precision level. 24. postgres=# SELECT to_char(CURRENT_DATE, 'YYYYMMDD')::integer; ┌──────────┐ │ to_char │ ╞══════════╡ │ 20190718 │ └──────────┘ (1 row) But I have to say, so working with this representation of date is strange and unhappy. 5. 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/Time Functions. A primer on working with time in Postgres. DATE_TRUNC() will return an interval or timestamp rather than a number. These SQL-standard functions all return values based on the start. It’s possible in Postgres to truncate or round a given timestamp to some given level of precision. date_trunc(text, timestamp) The date_trunc() function is used to truncate to specified precision; Return Type: timestamp. 4 shows the mathematical operators that are available for the standard numeric types. The DATE_TRUNC () function in Postgres truncate a date or time value to a specific precision. 9 postgres sql, date_trunc without extra zeroes. 9. the Use of the DATE_TRUNC () Function in PostgreSQL. PostgreSQL - DATE/TIME Functions and Operators. When used with a timestamp, truncates the timestamp to a date (day) value and returns a timestamp with or without time zone depending on type of the argument. SELECT date_trunc ('day', time), "PositionReport". You should be familiar with the background information on date/time data types from. ) This function takes two arguments. 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+01009. And best solution is 1st that suggested by marco-mariani. Sorted by: 5. But it would return a. 893878-04. As one gets converted to the other, there is absolutely no performance difference. Next. Add a comment. 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. SELECT date_trunc ('month', cast (my_date as timestamp)) FROM my_table. 3 . 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. select date_trunc('minute', now()) Edit: This truncates to the most recent minute. RPAD (‘ABC’, 6, ‘xo’) ‘ABCxox’. The function date_trunc is conceptually similar to the trunc function for numbers. The Timescale extension for PostgreSQL gives the ability to group by arbitrary time intervals. +01 +02 etc depends on your time locale's daylight saving rules. (In our example, we used month precision. 0. It’s possible in Postgres to truncate or round a given timestamp to some given level of precision. ) and a TIMESTAMP as parameters, and then it truncates the TIMESTAMP according to the specified date part. SPLIT_PART. What could be going wrong here. Truncate to specified precision; see Section 9. If you don't have new users every minute, you're going to have gaps in your data. date_trunc. date_trunc('field', source) source is a value expression of type timestamp (values of type date and time are cast automatically). ). Explore options like 'second', 'minute', 'hour', 'day', or 'month' to tailor your data analysis. In postgres, you could phrase this as: date_trunc ('quarter', current_date) + interval '3 months' - interval '1 day'. I have been trying to simulate the following Oracle statement in PostgreSQL: To reach this, I was already able to simulate the TRUNC () function receiving only one time datatype parameter, which is timestamp without time zone. ). 22. 372486-05'::timestamp with time zone); date_trunc ----- 2016-01-01 00:00:00-06 There is no such behavior when truncating to for example day: If you want to cast your created_at field, you have to write like this as following: CAST (transactions. Pictorial Presentation of PostgreSQL DATE_TRUNC() function. Fiddle with your system until. date_trunc. 9. For data type TIMESTAMP WITH LOCAL TIME ZONE this function is calculated within. You may be misunderstanding what date_trunc does. If I want to group a column of timestamps, say registered_at by the day on which they occurred, I can use either date_trunc('day', registered_at) or registered_at::date. ; some date parts include others: i. g. GMB GMB. The PostgreSQL CURRENT_TIMESTAMP () function returns the current date and time with time zone. il> writes: > At 08:19 +0300 on 30/04/1999, Christophe Labouisse wrote: >> create index ns_dt1_idx on netstats (date_trunc('day',NS_DATE) datetime_ops); > Seems as if the syntax requires that all the arguments for the function > should be attributes. You could truncate the date to the week's Monday, then subtract 1 day, e. 1. The date datatype is text. Hyperloglog is a Postgres extension for doing high-compression storage and query approximations. This uses PostgreSQL’s date_trunc () function, along with some date arithmetic to return the results we want. Share. To store date values, you use the PostgreSQL DATE data type. We have used the date_trunc function with the where clause to compare the date in PostgreSQL as follows. Sorted by: 3. Neither of those expressions will make use of an index on created - you would need to create an expression based index with the expression used in your queries. ·. Date and Time Functions are scalar functions that perform operations on temporal or numeric input and return temporal or numeric values. How to DATE_TRUNC by 10 days. Current Date/Time. Current Date/Time. date_trunc() Examples. If you want just the date in the current time zone, cast to a date. This function with datetime or string argument is deprecated, use DATE_TRUNC instead. 9. 9. ts BETWEEN a AND b is just a shorthand for writing ts >= a and ts <= b. 0. 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. , hour, week, or month and returns the truncated timestamp or interval with a level of precision. The function date_trunc is conceptually similar to the trunc function for numbers. 8. Use the DATE_TRUNC() function if you want to retrieve a date or time with a specific precision from a PostgreSQL database. Syntax. e. I tried date_trunc which does not have the precision I need. These SQL-standard functions all return.