9. To DELETE command will also delete all data from the table, but it may take more time if a table being deleted has a large amount of data. Examples A) Truncate to a whole number example. I need it to return april 22. You need to_char () to format a date or timestamp. You can use the date_trunc function to achieve this: select date_trunc('second', time_captured) from server_perf;. In other words we can use date_trunc for date values with a cast: select date_trunc ('month',current_date)::date; ┌────────────┐ │ date_trunc. How to convert this string into timestamp in postgresql? Hot Network QuestionsThe PostgreSQL TRUNCATE TABLE command is used to delete complete data from an existing table. Well, there are many ways to handle this, but the efficient way is to use date_trunc, as mentioned in the privous answer. Date/Time Functions. 1 Answer. It looks like this: select date_trunc('month',now()). POSTGRESQL Course Bundle - 5 Courses in 1 | 1 Mock Test. 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 ('day', yourtimestamp) will return a timesamp, but with hours, mins and secs to zero. rank ORDER BY s. When you use the TRUNCATE TABLE statement, it simply removes data from the table but keeps the structure unchangeable, and makes entries about it in. This query is working for me to give me the running total of total IDs by week. The date_trunc() function is used to truncate to specified precision. 03. g. 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). 9. PostgreSQL Version: 9. ) field is an identifier or string that selects what field to extract. The end date is also simplified; just add exactly one month. That truncates the date according to the timezone of the (Grafana) client resp. Basically this expression gives you the last day of the current quarter (provided that you remove the last closing parenthese, which otherwise is a syntax error). 9. 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. Sorted by: 2. DATE_PART関数 日付要素を数値で求める. e. I think you need to use a case statement: select (case when @timeinterval = 'day' then date (u. 22. date) AND DATE_TRUNC ('day', c. Sometimes you’ll need to specify what format the string is in through the function arguments. For the first day of the month it should be 1, and for the last - you simply add one day to the date and check whether it is the first day of the next month, this would mean that the. What could be going wrong here. created_at) when @timeinterval = 'month' then u. EXTRACT, date_part EXTRACT(field FROM source)The extract function retrieves subfields such as year or hour from date/time values. When I use date_trunc('day', current_date) + interval '1 day' - interval '1 second' for the upper bound, the query hangs seemingly forever. I have an sql query am trying to make to my postgres db. The conclusion therefore is that TRUNCATE is unbeatable if you want to delete all rows. How to Truncate a postgreSQL table with conditions. org> Reviewed-by: Isaac Morland <isaac. That means that TRUNCATE can be rolled back just like any other. 9. These SQL-standard functions all return values based on the start time of. date_trunc still gives me the whole date. 9. Follow. 9. Share. 9. 4. The format string 'YYYY-MM-DD' specifies the desired format for the. Sorted by: 3. Does date_trunc automatically work on current year when used with CURRENT_DATE? Yes, date_trunc('month', CURRENT_DATE) will truncate the current date. Date and Time Functions are scalar functions that perform operations on temporal or numeric input and return temporal or numeric values. Mathematical operators are provided for many PostgreSQL types. time_zone Hibernate property to the value of UTC. Sorted by: 89. Now I wanna round it off so it only has date-hours-minutes. Here’s how you can do it: SELECT TO_CHAR (your_date_column, 'YYYY-MM-DD') AS date_string FROM your_table; your_date_column is the name of the date column you want to convert to a string. So first, beware to modify the order of parameters, it's reverse here. These SQL-standard functions all return values based on the start time of the. 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. Create Postgresql index 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. Table 9-2 shows the available mathematical operators. It has the same effect as DELETE. 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: 9. (note that you need to remove the hour keyword if you use an interval with hours and minutes)This way you just truncate it, without assuming anything about the digits. The documentation of extract clearly states:. I can cast the PG date::timestamp(0) which gets me close but as would be expected the date is rounded. date_trunc PostgreSQL function equal for mySQL. The date_trunc() function in PostgreSQL is used to truncate a timestamp or interval value to a specified unit. PostgreSQL: operator does not exist: timestamp without time zone == timestamp without time zone. Asked 10 years, 9 months ago. For example I need to get number of sales each week. 1. I see that date_trunc function returns timestamp and intervals cannot be cast to date type: select current_date -. update foo set created_at = date_trunc('second', created_at) where created_at is not null; Instead of using date_trunc you can also just cast the value: created_at::timestamp(0) for the update statement, or current_timestamp::timestamp(0) in the default value. century. As far as I know, if I want to trunc date, I need to use the date_trunc() function in posgresql. The difference between them is that the latter returns the same data type like timestamptz keeping your time zone intact. The following table lists all window functions provided by PostgreSQL. TRUNC( date_value, format ) You are providing a string value instead of a date value and 'dd-mm-yy' is an invalid format (you just want to truncate to the start of the day using 'dd' as the format or the start of the month using 'mm' or the start of the year using 'yy' - but using all three together does not make. Postgres truncate timestamp gives slightly unexpected output. Rank the current row within its partition without gaps. Inspecting MCV Lists. 4 shows the mathematical operators that are available for the standard numeric types. Suppose the date is 4th July 2021 which is Sunday, then the date_trunc will result in. data = substring (NEW. In PostgreSQL, DATE_TRUNC Function is used to truncate a timestamp type or interval type with specific and high level of precision. For formatting functions, refer to Section 9. Truncate to specified precision; see Section 9. 3 Answers. g: 2013-05-03) or date with time (e. PostgreSQL 错误：函数date_trunc（没有时区的时间戳）不存在 在本文中，我们将介绍 PostgreSQL 数据库中的一个常见错误：函数 date_trunc(timestamp without time zone) 不存在。我们将详细解释该错误的原因，并提供解决方法和示例说明。 阅读更多：PostgreSQL 教程 PostgreSQL 中的日期和时间函数 PostgreThe query below shows sample data of your user adding an other user with a session over two days (to demonstrate the principle) The subquery day_cnt calculates the minimal start date of the sessions and the count_days that is covered with the sessions. The values in the datetime column include seconds. 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. SELECT TRUNC(datevalue, 'MONTH') FROM datelist; Result: 01/MAR/22. source is a value expression of type timestamp or interval. In this case, it is used to truncate the result of the subtraction operation to seconds. SELECT the_date FROM date_trunc('day', timestamp with time zone '2001-01-1 00:00:00+0100') as the_date results to. AND (date_trunc( 'day', current_timestamp AT TIME ZONE 'America/Santo_Domingo' ) AT TIME ZONE 'America/Santo_Domingo') +. 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 postgresSQLExample 3: Truncate a TIME value to the beginning of the minute. This is an excerpt from my sql query. Friday afternoon and I'm fried. So instead of having. In Oracle, the MET time zone is DST aware and the UTC offset is +02:00:00. 0. SELECT * FROM stud_cmp WHERE DATE_TRUNC('day', start_date) = '2020-01. For timestamp with time zone values, the number of seconds since 1970-01-01 00:00:00 UTC (can be negative); for date and timestamp values, the number of seconds since 1970-01-01 00:00:00 local time; for interval values, the total number of seconds in the interval. To remove all data from a table, you use the DELETE statement. PostgreSQL dynamic date_trunc function rounding up exactly to given timestamp. date_trunc('month', current_timestamp) gives you the start of "this month" so in March this would be 2021-03-1 as the comparison for the upper limit is done using < it will include everything on the last day of February. Expressing PostgreSQL timestamps without zones in local time. I have a column in my table say update_date with type timestamp without timezone. This column has the value as timestamp for all rows currently and have the same date part 2013-05-03, but difference in time part. 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. Assuming data type timestamp. This uses PostgreSQL’s date_trunc () function, along with some date arithmetic to return the results we want. BabaZuri. I am wondering if it's possible to truncate dates other than using the default choices using date_trunc. date_trunc ('day', TIMESTAMP '2001-02-16 20:38:40+00' AT TIME ZONE 'Australia/Sydney') HTH. Table 9-28 shows the available functions for date/time value processing, with details appearing in the following subsections. 30 illustrates the behaviors of the basic arithmetic operators ( +, *, etc. thedate, r. Example 3: PostgreSQL TRUNC() function. Postgresql: How to find hours between 2 dates and 2 times? 3. In Postgresql, we can also add a year to the current date using the INTERVAL data type. How to use date_trunc in PostgreSQL to truncate to 100 milliseconds? 1. event_day_count) AS ( SELECT event_name, date_trunc('day', event_date), count(id) FROM Table1 GROUP BY event_name, date_trunc('day', event_date) ORDER BY date_trunc('day', event_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. Definition of PostgreSQL Trunc () PostgreSQL’s trunc () function is used to truncate the decimal places to a certain precision. In PostgreSQL, the DATE_TRUNC function is used to truncate a date, time, or timestamp value to a specified precision. The second one which use DATE_TRUNC will tranc any date to the first day of the month. For formatting functions, refer to Section 9. ·. interval but not a specific interval like 5 minute or 5 days. 9. 10. Postgresql: How to find hours between 2 dates and 2 times? 3. Definition of PostgreSQL Trunc () PostgreSQL’s trunc () function is used to truncate the decimal places to a certain precision. Simplify calculation of months between 2 dates (postgresql) 0. TRUNCATE quickly removes all rows from a set of tables. Viewed 1k times 0 Context: I have a dataset in Superset of parts - item ids, order year, avg annual cost. Date_trunc function is used to truncate in specified precision. ADVERTISEMENT. 3. If this is not the case, just don't explicitly cast anything. I want to use date_trunc function in PostgreSQL on my datetime column to aggregate data in a week. , ages of people, years of services of employees, etc. SELECT date_trunc('MONTH', dtCol)::date; But getting the last day is not so straight forward. 次のように実例を示すとわかりやすいです。. date_trunc ( text, timestamp) → timestamp. g. How to Exclude Current or Partial Weeks in PostgreSQL. 1. Add a comment. PostgreSQL TRUNC() Function. PostgreSQL provides a number of functions that return values related to the current date and time. Now, let us see the Date/Time operators and Functions. 2018 00:00:00The extract function seems useful and the date function I have found solves some of my problems, but is there any way to replicate PostgreSQL's date_trunc? Following is an example of how I used to use date_trunc to match queried timestamps to only the last 4 months including the current month, but only if a week has passed into. . TRUNCATE quickly removes all rows from a set of tables. 4. This generates a timestamp value, that you can cast if you. 0. 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. +01 +02 etc depends on your time locale's daylight saving rules. Note that the latter returns a timestamp with time zone, not a timestamp value. SELECT CONVERT (VARCHAR (3), date_contact, 100) FROM. It shows a similar result, converting the date to a month and year value, which changes the day to the first of that month. custom DATE_TRUNC timeframes. 9. the date, from the provided timestamp. 0. DATE_TRUNC는 타임스탬프 값을 받아서, 특정 단위 밑을 잘라버리는 함수다. Basically this expression gives you the last day of the current quarter (provided that you remove the last closing parenthese, which otherwise is a syntax error). So using date_trunc('week',now())-'1 s'::interval; on the right side of your date operator should work. Load 7 more. 0. Truncate can be rolled back. The date_trunc function truncates a TIMESTAMP or an INTERVAL value based on a specified date part e. ) field selects to which precision to truncate the input value. 2. Table 9-2. 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). Truncate to specified precision; see Section 9. 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. SELECT date_trunc ('month', cast (my_date as timestamp)) FROM my_table. 1. Here’s the current timestamp. postgres sql, date_trunc without extra zeroes. After truncation, the table will appear empty to concurrent transactions, if they are using a snapshot taken before the truncation occurred. In Postgres, DATE_TRUNC () has the following intervals. 1. postgresql:postgresql:9. I changed the code in the 2nd try to be: boolean result = statement. Truncate to specified precision. You may be misunderstanding what date_trunc does. In this case, it is used to truncate the result of the subtraction operation to seconds. 04 LTS), take takes a full 8 seconds to truncate the tables and a build takes 84 minutes. Table 10-4. datepart. 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. 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) - 1By implementing the feature above, we are going to learn the following date functions in PostgreSQL: Truncate date with date_trunc; Extract date parts, such as weekday, month and year with date_part. 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. Finally, it returns the truncated part with a specific precision level. date_trunc will truncate a date or timestamp to the specified date/time part. Finding events relative to the present time with NOW () and CURRENT_DATE functions. When used to aggregate data, it allows you to find time-based trends like daily purchases or messages per second. The DATE_TRUNC function truncates a timestamp expression or literal based on the date part that you specify, such as hour, day, or month. The date_trunc function uses field either millisecond or second, but millisecond is too small for me and second too large. 9. These SQL-standard functions all return values based on the start. I have a column in my table say update_date with type timestamp without timezone. Client can search over this field with only date (e. This function truncates a date/time value to a specified precision. : 2013-05-03 12:20:00). Trimming trailing :00 from output after date_trunc. These SQL-standard functions all return values based on the start. CURRENT_TIMESTAMP関数 現在の日時を求める. Weeks rolling up to months in SQL (date_trunc) 0. The basic syntax of the DATE_TRUNC function is as shown below:. The precision values are a subset of the field identifiers that can be used with the EXTRACT() and DATE_PART() functions. The TRUNCATE command deletes large amount of data faster than the DELETE command. We’ll create three methods using several Spring Data JPA features: public interface ArticleRepository extends JpaRepository <Article, Integer> { List<Article> findAllByPublicationDate(Date publicationDate) ; List<Article. postgres=# SELECT NOW (); now ------------------------------- 2022-04-29. pdpn = conversion to double precision, then numeric (8,4) - 4 significant decimals kept, as wanted. Say, you can truncate it to the nearest minute, hour, day, month, etc. date) AND DATE_TRUNC ('day', c. 1. SELECT (date_trunc ('MONTH', '2019-02-28'::timestamp) + INTERVAL '2 MONTH - 1 day'); Note: If you are using this in a query then you are probably better to get the first day of the following month so your query can say where xxx > month1 and xxx < followingmonth (otherwise you end up losing the last days data). Four star feature compatibility Four star automation level Data Types PostgreSQL is using different function names. The Oracle code that I posted returns april 22, so I need postgres to do the same. (Expressions of type date are cast to timestamp and can therefore be used as well. CREATE TABLE log ( log_id SERIAL PRIMARY KEY, message VARCHAR ( 255) NOT NULL , created_at TIME DEFAULT. ). 0 to two decimal places. Improve this answer. 1. 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. For types without standard mathematical conventions (e. Truncate a date duration to the beginning of the month. 32 illustrates the behaviors of the basic arithmetic operators ( +, *, etc. 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. Follow edited May 17, 2022 at 11:56. PL/pgSQL Depends on. 1. and while the condition is > '2018-10-01' then all dates in the month October will not be shown in the result. date_trunc(text, timestamp) timestamp: Truncate to specified precision; see Section 9. After truncation, the table will appear empty to concurrent transactions, if they are using a snapshot taken before the truncation occurred. TRUNCATE statement is faster than the DELETE statement to delete all the rows of a table. com> Reviewed-by: Tom Lane. I'm a little confused about using trunc() function in postgresql. date_trunc('field', source) source is a value expression of type timestamp (values of type date and time are cast automatically). date_trunc() Examples. Friday afternoon and I'm fried. DATE_TRUNC('datepart', timestamp) Pendapat. group by month or year or week) so I am using the Extract(year from timestamp) function but I saw in the Postgresql documentation that there is a function date_part('year',timestamp) too which can do the same. Table 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. 9. The basic syntax of the DATE_PART function is as shown below: DATE_PART(field, source); where field is the. Postgres has lots of functions for interval and overlap so you can look at data that intersects. g. It’s possible in Postgres to truncate or round a given timestamp to some given level of precision. (Values of type date and time. When used to aggregate data, it allows you to find time-based trends like daily purchases or messages per second. select distinct datecalcul from Table where datecalcul > now () - INTERVAL '6 months' order by datecalcul asc. 1. 2. Code: SELECT TRUNC(67. 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). 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: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. Table 9-27 shows the available functions for date/time value processing, with details appearing in the following subsections. The "epoch" of a timestamp represents the number of seconds elapsed since a certain time and date (1st Jan 1970, 00:00:00). 9. LOCALTIME(precision) Arguments. If you do want to use BETWEEN (which will only work properly if date is defined with the data type date) then you can use: select * from my_table where date between date_trunc ('year', current_date - interval '1 year')::date and date_trunc ('year', current_date)::date - 1. , line 01 (2011/01/03 19:18:00. atZone (ZoneId. Client can search over this field with only date (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). This query is working for me to give me the running total of total IDs by week. Efficiently select beginning and end of multiple contiguous ranges in Postgresql query. g. 2. Otherwise, the result has the same day component as date. Count data using multiple date. I think you are looking for the date_trunc () function, which is used to truncate timestamps. for example 2018-10-15 will be 2018-10-01 and 2018-10-30 also will be 2018-10-01. By default, Oracle TRUNC truncates a datetime to day (sets the zero time): Oracle:-- Get the current datetime with time set to zero SELECT TRUNC (SYSDATE) FROM dual; # 2013-02-11 00:00:00 SELECT TRUNC (SYSDATE, 'DD') FROM dual; # 2013-02-11 00:00:00. date_trunc ( field, source [, time_zone ]) source is a value expression of type timestamp, timestamp with time zone, or interval. The time zone is variable. Here I confused which function I. PostgreSQL 8. Try " Select now () ", it will give you the system timestamp. e. To fix this, give it a name like evt_block_week and select that. In Postgres, DATE_TRUNC () has the following intervals. It looks like this: select date_trunc('month',now()). The trunc () function is used for truncating numbers, not dates. This function helps in manipulating numbers as required. You can also use DROP TABLE command to delete complete table but it would remove complete table structure from the database and you would need to re-create this table once again if you wish to store some data. For formatting functions, refer to Section 9. Its type is timestamp without time zone. Below is the example, and the syntax of the date_trunc function is as follows. PostgreSQL provides a number of functions that return values related to the current date and time. SELECT date_trunc ('week', day::DATE + 1)::date + 5 AS anchor, AVG (value) AS average FROM daily_metrics WHERE metric = 'daily-active-users' GROUP BY anchor ORDER BY anchor. - It retrieves the trimmed part with a specific precision level. Whereas NOW () and CURRENT_TIMESTAMP give the timestamp when the transaction started. - It accepts two arguments, a datePart, and a field. or to subtract one hour and 25 minutes: select current_time - interval '1:25'. The trunc () function is a mathematical function present in PostgreSQL. 2. date_trunc('hour', timestamp '2001-02-16 20:38:40') → 2001-02-16 20:00:00. 32 shows the available functions for date/time value processing, with details appearing in the following subsections. BabaZuri BabaZuri. I want something in between like 100 milliseconds (1/10 second). Extract isn't quite the same as date_trunc though. Valid formats are as follows:DATE_TRUNC() is a function used to round or truncate a timestamp to the interval you need. Truncate all the data in the table and just let the data of the last 6 months. 12. 33 shows the available functions for date/time value processing, with details appearing in the following subsections. Viewed 11k times. Furthermore, it reclaims disk space immediately, rather than requiring a subsequent VACUUM operation. It’s possible in Postgres to truncate or round a given timestamp to some given level of precision. A general solution for any time interval can be based on the epoch value and integer division to truncate. In PostgreSQL, the DATE_PART () function is used to query for subfields from a date or time value. 8. This can cause a difference for some comparisons. for example 2018-10-15 will be 2018-10-01 and 2018-10-30 also will be 2018-10-01. Date and Time Functions are scalar functions that perform operations on temporal or numeric input and return temporal or numeric values. Where: position = original value, truncated to 3 or less decimals by pg for unknown reasons. 876944') * 1000; would give. it takes over 1 second to perform the truncation. Truncate and Delete, and based upon them, we should be able to find out when DELETE is better option for removing data or TRUNCATE should be used. 14. ). It will not convert the value to a date. You need to keep in mind that TRUNCATE can only be used if you want to clean an entire table (or partition), while DELETE was designed to remove rows more selectively. Use the aggregate FILTER clause in Postgres 9. date_trunc(text, timestamp) timestamp: Truncate to specified precision; see also Section 9. if you want timestamp instead of timestamptz cast the date to timestamp first. g. 24. TRUNCATE quickly removes all rows from a set of tables. 9. SELECT id, date , date_trunc('quarter', date - interval '2 month') + interval '2 month' AS quarter FROM player_daily_score;How DELETE and TRUNCATE work. The PostgreSQL “Date Part” function may also be used to retrieve the day, month, and year, i. Multiply it by 1000 to turn it into milliseconds. It has the same effect as an unqualified DELETE on each table, but since it does not actually scan the tables it is faster. Postgres truncates trailing zeros for timestamps. 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: PostgreSQL group by day is used to retrieve the data by using day basis, we have applied group by clause on date_trunc function to retrieve table data as per day basis in PostgreSQL. For example, date_trunc can aggregate by one second, one hour,. Syntax is as shown below: ALTER TABLE table_name ADD COLUMN column_name data_type [column_constraints]; Where: Below is an example to add a new column “email” of data type varchar(255) to a table “users”. SELECT * FROM Conference WHERE date_start >= date_trunc ('month', current_date - interval '1' month) and date_start <. ) This function takes two arguments. (In our example, we used month precision. PostgreSQL: truncate hour/min/second from a timestamp. Truncate to specified precision; see Section 9. The date part to which to truncate the timestamp value. 9. Follow. Use the TRUNCATE TABLE command to delete all the data from the specified table in PostgreSQL Database. Finding events relative to the present time with NOW () and CURRENT_DATE functions. 1 I am using PostgreSQL 9. (Expressions of type date are cast to timestamp and can therefore be used as well. 963179 secs juin 2, 2022, 12:00 AM | 0 years 0 mons 0 days 0 hours 2 mins 34. PostgreSQL - Date Difference in Months. TRUNC (number [, precision]) Code language: CSS (css) Arguments. (Values of type date and time are cast automatically to timestamp or interval, respectively. Don't forget to keep the timezone in mind.