So instead of having. 0 did not follow the conventional numbering of centuries, but just returned the year field divided by 100. Basically, there are two parameters we. A regular select date_trunc('month', t. The end date is also simplified; just add exactly one month. CREATE TABLE log ( log_id SERIAL PRIMARY KEY, message VARCHAR ( 255) NOT NULL , created_at TIME DEFAULT. Its Java equivalent is: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. What is the linq equivalent to sql trunc date? 0. , week, year, day, etc. 1. Introduction to the PostgreSQL date_trunc function. 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. 9. 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. Teams. g. You can use DateStyle to control how PostgreSQL emits dates, but it's global and a bit limited. 2. The problem is, that I want to "date_trunc('month', start_date). Jun 2 at 11:46. PostgreSQL is a powerful database and includes various functions for managing timestamps and date times. A similar functionality provides the Oracle compatible function TRUNC [ATE] (datetime). 2: date_trunc('hour', timestamp '2001-02-16 20:38:40') 2001-02-16 20:00:00:. Gordon Linoff went further in his. I want to create an index that returns the same output as this query; --takes 2005-10-12 select date_trunc ('month',table_withdates. 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('field', source) source is a value expression of type timestamp (values of type date and time are cast automatically). created_at as timestamp) at time zone '+08:00'))::DATE AS period_start FROM transactions LIMIT 1. 000000の場合3 Answers. The date/time functions provide a powerful set of tools for manipulating various date/time types. So current_date - 1 would be enough. ). 3 Answers. PostgreSQL Version: 9. 16. SELECT date_trunc ('day', time), "PositionReport". Viewed 1k times 0 Context: I have a dataset in Superset of parts - item ids, order year, avg annual cost. id) FROM ( select to_char (date_trunc ('day', (current_date - offs)), 'YYYY-MM-DD') AS date FROM generate_series (0, 365, 1) AS offs ) d JOIN sharer_emailshare se ON (d. 6. Truncate datetime column in MySQL query. Share. 1 Answer. For. SyntaxFor common time intervals built into date_trunc() (like 1 hour and 1 day in your examples) you can use a shortcut. date_trunc関数の第一引数には任意の値を文字列として指定する。. trunc() will set that to 00:00:00. The seconds field, including fractional. It has the same effect as an unqualified DELETE on each table, but since it does not actually scan the tables it is faster. DATE_TRUNC: TIMESTAMP date_trunc is only defined for timestamp with time zone and timestamp inputs. Consequently, the timestamp will be rounded/truncated based on the specified date field. PostgreSQL releases before 8. The full docs in section 9. So current_date - 1 would be enough. The following code was working on Hibernate 5. Example: PostgreSQL DATE_TRUNC() function : Example: Code: SELECT date_trunc('hour', timestamp '2002. Current Date/Time. Remove the longest string that contains specified characters from the right of the input string. In postgres, you could phrase this as: date_trunc ('quarter', current_date) + interval '3 months' - interval '1 day'. Based on the parts extracted, create a new datetime. 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. date_trunc(text, timestamp) timestamp: Truncate to specified precision; see also Section 9. +01 +02 etc depends on your time locale's daylight saving rules. 2. This is most useful on large tables. 9. I want to use date_trunc function in PostgreSQL on my datetime column to aggregate data in a week. PostgreSQL DATE_TRUNC by 2 Weeks. 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. g. Try this one: select to_char (trunc_date,'FMMonth YYYY') from ( select distinct date_trunc ('month', orderdate) as trunc_date from table order by trunc_date desc ). 5. In order to group our orders by month, in PostgreSQL we'll use the date_trunc built-in function. SELECT TRUNC(CURRENT_TIMESTAMP) Postgresql. These SQL-standard functions all return values based on the start. only date_trunc(text,interval) and date_trunc(text,timestamp) are immutable. , work with Date objects directly and not use date_trunc. The cast to date ( day::date) does that implicitly. Below is the example, and the syntax of the date_trunc function is as follows. 26 lists them. So using date_trunc('week',now())-'1 s'::interval; on the right side of your date operator should work. The time zone in result is shifted by 1hr: select date_trunc('year','2016-08-05 04:01:58. 3. The below example shows the group by month by using the date_trunc function. 2. - The value for the field. How to DATE_TRUNC by 10 days. SELECT date_trunc('day', loggedin) AS "Day" , count(*) AS "No. to_char and all of the formatting functions let you query time however you want. I use this in a group by query to get a count for a certain amount of dates. PostgreSQL Version: 9. Improve this answer. DATE_TRUNC('datepart', timestamp) Arguments. 8) Postgres DATE_TRUNC() Function. SELECT * FROM Conference WHERE date_start >= date_trunc ('month', current_date - interval '1' month) and date_start <. 9. Read: Postgresql date_trunc function Postgresql date add year. This function truncates a date/time value to a specified precision. 61 Avg. Example. When storing a date value, PostgreSQL uses the yyyy-mm-dd format e. ) field selects to which precision to truncate the input value. Simply try. Is there any way possible or workaround I can do to say that the first month of first quarter is for instance September? only date_trunc(text,interval) and date_trunc(text,timestamp) are immutable. if you want timestamp instead of timestamptz cast the date to timestamp first. 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. AT TIME ZONE. Date_trunc is a function that returns a date part of a date or a time part of a time. Summary: in this tutorial, we will introduce you to the PostgreSQL DATE_PART() function that allows you to retrieve subfields e. The problem is date_trunc('week', datetime_column) function considers Monday as the week start day and some of my customers user different start day in calendar (like Saturday). Current Date/Time. Truncate date in units other than default choices using date_trunc (Postgres 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. It can be used with or without time zone, and it can be used with different data types such as date, time, or interval. I can't believe the accepted answer has so many upvotes -- it's a horrible method. Syntax: DATE_PART (field, source) In the above syntax the field is an identifier that is used to set the field to extract the data from the source. date_trunc¶. It will return the date truncated to month precision, e. 9. Ordering by month & year numbers in Postgres. date_trunc will truncate a date or timestamp to the specified date/time part. 03. e. date_trunc() Examples. 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. 2) at or above day precision, the time zone offset is recalculated, according to the current TimeZone configuration. You can use this for PostgreSQL. Sorted by: 14. date, count (se. 1) 2. ktkr！ と思ったのですが、、、 SELECT CURRENT_DATE; でよかったorz. 2. Example of grouping sales from orders by month: select SUM(amount) as sales, date_trunc('month', created_at) as date from orders group by date order by date DESC; In Postgresql, to truncate or extract the week of the timestamp value, pass the week as a string to the date_trunc function. 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. 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. How to perform date_trunc query in Postgres using SQLAlchemy. I tried date_trunc which does not have the precision I need. Create Postgresql index with date_trunc. 9. 2. code:Apache Superset PostgreSQL 'function date_trunc(unknown, bigint) does not exist. ERROR: function date_trunc(unknown, text) does not exist HINT: No function matches the given. PostgreSQL. Teams. MySQL - Truncating Date/Time and Subtracting from Each Other. The lowest and highest values of the DATE data type are 4713 BC and 5874897 AD. 0 did not follow the conventional numbering of millennia, but just returned the year field divided by 1000. 4. To generate a series of dates this is the optimal way: SELECT t. Note that this will return an actual timestamp; from the wording of the question, the actual column has a string, so you will need to cast it to compare: WHERE CAST ("time" as timestamp) < date_trunc ('day', now () - interval '1 month') – IMSoP. 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. 299. Let’s see the following example. Table 9-27 illustrates the behaviors of the basic arithmetic operators ( +, *, etc. Table 9. 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. The DATE_TRUNC() function will truncate timestamp or interval data types to return a timestamp or interval at a specified precision. 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. Share. This can be combined with INTERVAL computations and the extract operation to do pretty much anything you need to with dates and times. The extract function () is used to retrieves subfields such as year or hour from date/time values. I need it to be a postgresql DATE type so I can insert it into another table that expects a DATE value. 1. 0) $$. 300) must add 10 minutes and collect all the line that are within this time interval, or , all records that are between 19:18:00. 22. As shown in the results, the hours and above are preserved, while the minutes and seconds is truncated. This uses PostgreSQL’s date_trunc () function, along with some date arithmetic to return the results we want. The date_trunc() function is used to truncate to specified precision. You could truncate the date to the week's Monday, then subtract 1 day, e. 2: date_trunc('hour', timestamp '2001-02-16 20:38:40'). Its Java equivalent is: Instant. The Timescale extension for PostgreSQL gives the ability to group by arbitrary time intervals. In Postgres, DATE_TRUNC () has the following intervals. Sorted by: 3. 599Z'::timestamp); date_trunc ----- 2022-06-15 08:27:00 An alternative is to round the seconds with ::timestamp(0) - see this other answer. You can use this for PostgreSQL. The table currently has nearly 5 million rows and this query currently takes 8 seconds to execute. Simplify calculation of months between 2 dates (postgresql) 0. 2. id month 1 01/2021 2 03/2020 3 05/2019 The query I tried, select id, date_trunc('month',date)::date as date_month from schema. I. 9. 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. TRUNCATE quickly removes all rows from a set of tables. Note that the latter returns a timestamp with time zone, not a timestamp value. 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. Finding events relative to the present time with NOW () and CURRENT_DATE functions. milliseconds contains seconds & microseconds contains milliseconds (and thus seconds too). ). 0. The result is 03 records. 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. , 2000-12-31. 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. end_date) >= DATE_TRUNC ('day', q. The DATE type in PostgreSQL can store a date without an associated time value: PostgreSQL uses 4 bytes to store a date value. ADVERTISEMENT. date_created >= { {date_range_start}} and l. PostgreSQL provides a number of functions that return values related to the current date and time. Chapter 9. 4 shows the mathematical operators that are available for the standard numeric types. source is a value expression of type timestamp or interval. 3. sslaws mentioned this issue on May 2, 2022. Date and Time Functions are scalar functions that perform operations on temporal or numeric input and return temporal or numeric values. date_trunc. The result should be change to the nearest time i. Connect and share knowledge within a single location that is structured and easy to search. Both are b-tree indexable operations. The following illustrates the syntax of the date_trunc function: Date_trunc is a function that returns a date part of a date or a time part of a time. date_trunc. I just want to point out that it is often convenient to leave the value as a date. EXTRACT(field FROM source) Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) Arguments. ) field selects to which precision to truncate the input value. If you need to, you can have your own in the following ways as a. Also per the H2 docs Trunc:. Integer division truncates. 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. The range of values for date values in PostgreSQL is 4713 BC to 5874897 AD. Date/Time Functions. The function date_trunc is conceptually similar to the trunc function for numbers. You cannot specify a format for it. 基本的な使い方を見ていこう。. See full list on database. custom DATE_TRUNC timeframes. Date_Trunc varies parts of the date/time: century, year, month, day, hour, minute, second, millisecond,. 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. create function end_of_month(date) returns date as $$ select (date_trunc('month', $1) + interval '1 month' - interval '1 day')::date; $$ language 'sql' immutable strict; EDIT Postgres 11+ Pulling this out of the comments from @Gabriel , you can now combine interval expressions in one interval (which makes things a little shorter):SELECT the_date FROM date_trunc('day', timestamp with time zone '2001-01-1 00:00:00+0100') as the_date results to. There is no function you want, but as said in postgresql wiki you can define function for youself: CREATE OR REPLACE FUNCTION round_time_10m (TIMESTAMP WITH TIME ZONE) RETURNS TIMESTAMP WITH TIME ZONE AS $$ SELECT date_trunc ('hour', $1) + INTERVAL '10 min' * ROUND (date_part ('minute', $1) / 10. I think you need to use a case statement: select (case when @timeinterval = 'day' then date (u. The real value returned by the CURRENT_TIMESTAMP was ‘2023-06-17 14:45:08. when querying the data, explain shows that all partitions are being queried when I'm constructing a date with date functions, whereas when I use hard coded dates only the targeted partitions are being scanned. A primer on working with time in Postgres. naylor@enterprisedb. These SQL-standard functions all return values based on the start. E. Postgres has lots of functions for interval and overlap so you can look at data that intersects. These functions all follow a common calling convention: the first argument is the value to be. Very unlikely to change though. . Now, let us see the Date/Time operators and Functions. Viewed 11k times. For some formats, ordering of month, day, and year in date input is ambiguous and there is support for specifying the expected ordering of these fields. See the table of available functions for date/time value processing and the examples of date_trunc usage. The documentation shows following usage example: SELECT date_trunc('hour', TIMESTAMP '2001-02-16 20:38:40'); Result: 2001-02-16 20:00:00 So I thougt this should work: The date datatype is text. That is easy enough to add. Truncation means setting specific parts of the date or time to zero or a default value while keeping the more significant parts unchanged. 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. 3. century. 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，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. you need to qualify the field with the table name. 4. date_trunc(text, timestamp) timestamp: Truncate to specified precision; see also Section 9. This generates a timestamp value, that you can cast if you. 9. But there is also no point in casting date literals to date as input parameter. Translate to PostgreSQL generate_series #2144. 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. Alternatively, create a function in postgres date_trunc_day(timestamp) that calls date_trunc('day', timestamp) and call the new function instead. 7. Get subfield. What could be going wrong here. callsign. With PostgreSQL there are a number of date/time functions available, see here. select date_trunc('week','2005-07-12'::timestamp)::date; date_trunc ----- 2005-07-11 (1 row) More info:. edited Aug 18, 2015 at 10:57. POSTGRESQL Course Bundle - 5 Courses in 1 | 1 Mock Test. 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. Truncation means setting specific parts of the date or time to zero or a default value while keeping the more significant parts unchanged. 1 Answer. The "epoch" of a timestamp represents the number of seconds elapsed since a certain time and date (1st Jan 1970, 00:00:00). 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 9. 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. 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. 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. Syntax. , hour, week, or month and returns the truncated timestamp or interval with a level of precision. 首先介绍一下Oracle的trunc函数:. 19, earlier I have made the following Query. You cannot use the date_part of week when using DATE_TRUNC on an INTERVAL. The precision values are a subset of the field identifiers that can be used with the EXTRACT() and DATE_PART() functions. (Values of type date and time are cast automatically to timestamp or interval, respectively. date; The results:見つけたのがdate_trunc関数。 date_trunc関数 「おぉ、イイネ！（・∀・）ﾆﾔﾆﾔ」となり、早速実験。 SELECT date_trunc('day', now()); 結果を見てみると 2013-05-01 00:00:00+0. 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;I have a slow query that generates a report of account activity per week over the past year. 9. 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. . LOCALTIME(precision) Arguments. 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 could think of it as a date version of the. SELECT date_trunc('MONTH', CURRENT_DATE) + INTERVAL '1 MONTH - 1 DAY'; Tip 2. The answer depends on whether it is a timestamp with time zone or one without: If it's a timestamp with time zone, you can convert to PST with select time1 AT TIME ZONE 'US/Pacific' and get the date with select date_trunc ('day', time1 AT TIME ZONE 'US/Pacific') If it's a timestamp without time zone stored in UTC that you. *, (first_week + ( (date - first_week::date) / 14)*14 * interval '1 day')::date as biweek from (select t. Update. 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. SELECT date_trunc ('month', cast (my_date as timestamp)) FROM my_table. PostgreSQL date_part function will allow retrieving subfields from the date and time value, e. Truncate a date in Postgres (latest version) 0. In Oracle, the MET time zone is DST aware and the UTC offset is +02:00:00. ts BETWEEN a AND b is just a shorthand for writing ts >= a and ts <= b. For example I need to get number of sales each week. It's bad practice but you might be forgiven if you use. How to truncate seconds from a column (timestamp) in PostgreSQL without using date_trunc function. 9. 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。. This can be broken down into 4 steps: Take the current timestamp with time zone: now () Get the according local timestamp without time zone for New York: now () AT TIME ZONE 'America/New_York'. *, min (date_trunc ('week', date)) over () as first_week from t ) t; Here is a db<>fiddle. PostgreSQL dynamic date_trunc function rounding up exactly to given timestamp. How to use date_trunc in PostgreSQL to truncate to 100 milliseconds? 1. 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. In PostgreSQL, the DATE_TRUNC function is used to truncate a date, time, or timestamp value to a specified precision. An alternative pproach is to use to_char function. 2. trunc() will set that to 00:00:00. date_trunc ( text, timestamp) → timestamp. When used to aggregate data, it allows you to find time-based trends like daily purchases or messages per second. Input Format: Dates in yellow are the dates to aggregate sales on. Share. 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. date_created) )AS DAY, this is my output 2013-02-04 00:00:00+00. 8. 0. PostgreSQL releases before 8. Its return type is TIMESTAMP with TIMEZONE. 例1：now()=2023-04-18 00:00:00. now (). lead_id) as "# New Leads" from leads l where l. The following illustrates the syntax of the EXTRACT() function:. Table 8-9. You obviously got my point, because you added a remark to your answer that they should use a date column for the month. 1. 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. But there is also no point in casting date literals to date as input parameter. ) field selects to which precision to. The example below finds the hour part from the timestamp (date and time specified in the argument) . The precision is used to set the number of digits in the fractional seconds precision in the second field of the returned query. I want to be able to: apply a mathematical operator to subtract 1 day filter it . 3 . Use the DATE_TRUNC() function if you want to retrieve a date or time with a specific precision from a PostgreSQL database. Extract year from postgres date. In the first example, we have not used the aggregate function, in the second example, we have used the aggregate function. date_trunc can be really helpful if you want to roll up time fields and count by day or month. 6. , date/time types) we describe the actual behavior in subsequent sections. – zhrist. This may be a bit sub-optimal, but it works. trunc (teste TIMESTAMP WITHOUT TIME ZONE). In this case, for the month before last I'd write:Learn how to round or truncate timestamps in PostgreSQL for effective time-based grouping using the date_trunc function. 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): SELECT the_date FROM date_trunc('day', timestamp with time zone '2001-01-1 00:00:00+0100') as the_date results to. date_trunc “truncates” a TIMESTAMP or an INTERVAL value based on a specified date part (e. Select Query SELECT (date_trunc('MONTH', now()) + INTERVAL '1 MONTH -. Syntax: date_trunc(text, timestamp) Return Type: timestamp. Date/Time Input. ac.