thedate), s. 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. I have a slow query that generates a report of account activity per week over the past year. I edited my full query into my post now. But the start day is coming as Monday. The values in the datetime column include seconds. or you can create your own. , table_z; Deleting content of named tables and tables that reference to them (I will explain it in more details later in this answer): TRUNCATE table_a, table_b. So using date_trunc('week',now())-'1 s'::interval; on the right side of your date operator should work. For formatting functions, refer to Section 9. Improve this answer. date_trunc. 1305621628876. MySQL - Truncating Date/Time and Subtracting from Each Other. Sorted by: 3. Truncate to specified precision; see Section 9. 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+0100Postgresql SQL GROUP BY time interval with arbitrary accuracy (down to milli seconds) I want to aggregate data at 5 minute intervals in PostgreSQL. g. timestamp '2001-09-29 03:00' - timestamp '2001-09-27 12:00'. Isolating hour-of-day and day-of-week with EXTRACT function. Basically, there are two parameters we. Valid formats are as follows:DATE_TRUNC() is a function used to round or truncate a timestamp to the interval you need. Say, you can truncate it to the nearest minute, hour, day, month, etc. This query is working for me to give me the running total of total IDs by week. SELECT my_date::date::timestamp. decade. rank) FROM serps s LEFT JOIN ranks r ON r. The PostgreSQL LOCALTIME function returns the current time at which the current transaction starts. , date/time types) we describe the actual behavior in subsequent sections. PostgreSQL offers various built-in functions to group data by time, such as the DATE_TRUNC(), EXTRACT(), and DATE_PART() functions. TO_DATE () – convert a string to a date format. 32 shows the available functions for date/time value processing, with details appearing in the following subsections. 19, earlier I have made the following Query. I'm trying to create what should be a super simple line chart showing the avg annual. out. PostgreSQL date_part function will allow retrieving subfields from the date and time value, e. date_created) )AS DAY, this is my output 2013-02-04 00:00:00+00. It also uses this format for inserting data into a. Some details are different for date or timestamptz. The trunc () function is used for truncating numbers, not dates. start_date) <= DATE_TRUNC ('day', q. values date_trunc('MINUTE', TIME('20:38:40')); Result: 20:38:00; Example 4: A date duration has the data type DECIMAL(8,0). 0) $$ LANGUAGE SQL; 这是 PostgreSQL date_trunc() 函数的语法： date_trunc ( field TEXT , source TIMESTAMP ) -> TIMESTAMP date_trunc ( field TEXT , source TIMESTAMPTZ , time_zone TEXT ) -> TIMESTAMPTZ date_trunc ( field TEXT , source INTERVAL ) -> INTERVAL I am wondering if it's possible to truncate dates other than using the default choices using date_trunc. Relating to this question. org> Reviewed-by: Isaac Morland <isaac. 1 min read. 9. This may be a bit sub-optimal, but it works. 1. I have a table partitioned per month (timestamp column). 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. SELECT MONTH (date_contact) FROM YourTable; Which will return the month number, and if you want to return the month name, then you can use DATENAME () function. The following illustrates the syntax of the date_trunc function: date_trunc ('datepart', field) Code language: SQL (Structured Query Language) (sql) date_trunc ( field, source [, time_zone ]) source is a value expression of type timestamp, timestamp with time zone, or interval. When storing a date value, PostgreSQL uses the yyyy-mm-dd format e. The below will index but returns with timestamp added to date which. 481 ms. date) going over the. TRUNCATE quickly removes all rows from a set of tables. 8. The basic syntax of the DATE_PART function is as shown below: DATE_PART(field, source); where field is the. I can't believe the accepted answer has so many upvotes -- it's a horrible method. 2) and found the date_trunc function extremely useful for easily matching time stamps between certain days/months/etc. Try " Select now () ", it will give you the system timestamp. I edited my full query into my post now. Subtract one month from the current month, then "truncate" that to the beginning of that date. SQL Server Usage. For example I need to get number of sales each week. 0. date_trunc('month', '{{ date. It takes a date part (like a decade, year, month, etc. Definition of PostgreSQL Trunc () PostgreSQL’s trunc () function is used to truncate the decimal places to a certain precision. Note that the specifier is a string and needs to be enclosed in quotes. 0. 264792 secs I want this whole T_time in minutes so 51 days (minutes) + 24 (minutes) + 21 etc I tried using extract but that kind of just extracts minutes without adding. For removing the data and preserving the table-structures in pgAdmin you can do: Right-click database -> backup, select "Schema only". The following example shows how to use the date_trunc() function to truncate a timestamp value to hour part, as follows: Introduction to the PostgreSQL date_trunc function. Date/Time Input. Functions and Operators. In other words, we can use this function to map (or force) a timestamp to the nearest specified interval. Bagian tanggal untuk memotong nilai stempel waktu. Skipping the second argument. I need it to be a postgresql DATE type so I can insert it into another table that expects a DATE value. These SQL-standard functions all return values based on the start. The special difficulty of your task: you want the ceiling, not the floor (which is much more common). g. : 2013-05-03 12:20:00). Oracle. trim the time out of the range. date_trunc ('day', TIMESTAMP '2001-02-16 20:38:40+00' AT TIME ZONE 'Australia/Sydney') HTH. Postgres truncate timestamp gives slightly unexpected output. Truncate datetime column in MySQL query. DATE_TRUNC. PostgreSQL's approach uses the month from the earlier of the. Postgres 11 adds essential functionality. Well, there are many ways to handle this, but the efficient way is to use date_trunc, as mentioned in the privous answer. 0. end_date) >= DATE_TRUNC ('day', q. For formatting functions, refer to Section 9. 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。. Date_Trunc varies parts of the date/time: century, year, month, day, hour, minute, second, millisecond,. TRUNC (number [, precision]) Code language: CSS (css) Arguments. Clearly, that column with a 2k character long string shouldn't be indexed -- or not with a btree. source must be a value expression of type timestamp, time, or interval. For example I need to get number of sales each week. g. 1. 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. 例1：now()=2023-04-18 00:00:00. 1) below the day precision (first parameter) the time zone offset of the result is always the same as the second parameters' offset. You need to_char () to format a date or timestamp. The date part to which to truncate the timestamp value. The best way to reset a sequence to start back with number 1 is to execute the following after you have successfully truncate it: ALTER SEQUENCE <tablename>_<id>_seq RESTART WITH 1. 5 for more details. 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. 31 shows the available functions for date/time value processing, with details appearing in the following subsections. g. Trunc date field in mysql like Oracle. SELECT date_trunc('week', date::date) AS "weekly&quo. 03. 2 do mention both forms though. 9. Calculate the end day of a week with DATE_TRUNC in PostgreSQL. - The value for the “field” argument must be valid. The documentation of extract clearly states:. You may want to use statement_timestamp (). 9. AT TIME ZONE. 8. If I use it like ths: select trunc(now(),'MM'). pdb = conversion to double precision - all decimals restored. Sorted by: 3. Date/Time Functions and Operators. 9. 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. date_trunc('hour', timestamp '2001-02-16 20:38:40') → 2001-02-16 20:00:00. 9. These functions all follow a common calling convention: the first argument is the value to. 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. PostgreSQL provides a number of functions that return values related to the current date and time. It's not immutable because it depends on the sessions time zone setting. Truncate can be rolled back. Table 8-9. ) field is an identifier or string that selects what field to extract. First you should know that 'PST timezone is 8 hours behind UTC timezone so for instance Jan 1st 2014, 4:30 PM PST (Wed, 01 Jan 2014 16:00:30 -0800) is equivalent to Jan 2nd 2014, 00:30 AM UTC (Thu, 02 Jan 2014 00:00:30 +0000). 9. 9. , hour, week, or month and returns the truncated timestamp or interval with a level of precision. CURRENT_TIMESTAMP関数 現在の日時を求める. Table 9-2. 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”. GROUP BY 1. date_trunc can be really helpful if you want to roll up time fields and count by day or month. PostgreSQL interval data type value involves 16 bytes storage size, which helps to store a period. Method 4 to Convert Timestamp to Date PostgreSQL: Using PostgreSQL’s Date Part Function. The PostgreSQL TRUNC() function returns the same numeric data type as the first argument if the second argument is not specified. date_trunc still gives me the whole date. 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. Say, you can truncate it to the nearest minute, hour, day, month, etc. The PostgreSQL “Date Part” function may also be used to retrieve the day, month, and year, i. of ("Asia/Tehran")). Finding events relative to the present time with NOW () and CURRENT_DATE functions. To store date values, you use the PostgreSQL DATE data type. 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. But, for some reasons, the length of the Month value is fixed to the longest month name available. TRUNC() function returns the result as a numeric data typeMy SQL is: SELECT date_trunc('week', '2020-06-01'::timestamp)::date ||'-'|| (date_trunc('week', '2020-06-01'::timestamp)+ '6 days'::interval)::date; However, using. 6. The PostgreSQL date_trunc() function truncates a specified timestamp or interval value to the specified part and returns the result. It looks like this: select date_trunc('month',now()). Suppose the date is 4th July 2021 which is Sunday, then the date_trunc will result in. DATE_PART関数 日付要素を数値で求める. atZone (ZoneId. 3. edited Aug 18, 2015 at 10:57. Day 1. Truncation means setting specific parts of. 03. com> Reviewed-by: Tom Lane. Friday afternoon and I'm fried. Use text type with trigger instead: create table mytable ( data text ); create or replace function mytable_data_trunc_trigger () returns trigger language plpgsql volatile as $$ begin NEW. trim the time out of the range. 32 illustrates the behaviors of the basic arithmetic operators ( +, *, etc. Author: John Naylor <john. I want this to be just 2013-02-04. 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. Postgresql Completing date_trunc(ts,'hour') with missing values. so after the TRUNCATEing txn commits, concurrent txns started before the TRUNCATE will see the table as empty. Its syntax is TO_DATE (text, text),it converts string to date according to the given format and returns the converted date. e. e. When I use date_trunc('day', current_date) + interval '1 day' - interval '1 second' for the upper bound, the query hangs seemingly forever. 0 Replicate Oracle's `TRUNC(DATE, 'WW')` behaviour in PostgreSQL. DATE_TRUNC () will return an interval or timestamp rather than a number. Table 9. As far as I know, if I want to trunc date, I need to use the date_trunc() function in posgresql. Introduction to the PostgreSQL date_trunc function. 0) $$. 3 . DATE_TRUNC는 타임스탬프 값을 받아서, 특정 단위 밑을 잘라버리는 함수다. PostgreSQL TRUNC() Function. The trunc () function is used for truncating numbers, not dates. I have tried using function date_trunc('day', d_date::timestamp) but I get that is always staying in the same day. See Section 13. SELECT DATENAME (Month, date_contact) FROM YourTable; OR. Functions and Operators. Ignoring seconds from timestamp postgres. Furthermore, it reclaims disk space immediately, rather than requiring a subsequent VACUUM operation. (It could theoretically rewrite the date_trunc. 000000 Example 2: (This one works fine)Read: Postgresql date_trunc function Postgresql date add year. (Expressions of type date are cast to timestamp and can therefore be used as well. 00 (which is what it does), but to keep it at 19. (Values of type date and time are cast automatically to timestamp or interval, respectively. This generates a timestamp value, that you can cast if you. g. 29 4 4 bronze badges. The second one which use DATE_TRUNC will tranc any date to the first day of the month. Table 9. data for 2); return NEW; end; $$; create trigger mytable_data_truncate_trigger before insert or. Simply try. The precision values are a subset of the field identifiers that can be used with the EXTRACT() and DATE_PART() functions. Yeah. PostgreSQL sequence of full weeks number between two dates. ). g. The following illustrates the syntax of the AGE () function: The AGE () function accepts two. LOCALTIME(precision) Arguments. On the other hand you can use date_trunc function. , date/time types) we describe the actual behavior in subsequent sections. 45 (1 row) Previous: TAN function Next: PostgreSQL ARRAY functions ARRAY_APPEND function Follow us on Facebook and Twitter for. 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. These SQL-standard functions all return values based on the start. This uses PostgreSQL’s date_trunc () function, along with some date arithmetic to return the results we want. Here is what is going on. PostgreSQL - Date Difference in Months. RTRIM. In PostgreSQL, the DATE_BIN () function enables us to “bin” a timestamp into a given interval aligned with a specific origin. 31 illustrates the behaviors of the basic arithmetic operators ( +, *, etc. date_trunc. There are other possibilities, but 'day', 'month', and 'year. Let's say you have a simple query that groups by week and looks back at the last 4 weeks: select date_trunc ('week', created_at), -- or hour, day, month, year count(1) from users where created_at > now () - interval '4 weeks' group by 1; If you ran this query midweek, say on a Wednesday. or to subtract one hour and 25 minutes: select current_time - interval '1:25'. date_trunc will truncate a date or timestamp to the specified date/time part. 1: Date/Time Types. It has the same effect as DELETE. In PostgreSQL, the DATE_TRUNC () function trims unnecessary values from the date and time and returns a result with specific precision. 23. It has the same effect as an unqualified DELETE on each table, but since it does not actually scan the. RTRIM (‘abcxxzx’, ‘xyz’) ‘abc’. 9. Share. If you phrase your query as:Essentially, time_bucket() is a more powerful version of the standard PostgreSQL date_trunc() function. custom DATE_TRUNC timeframes. date | interval juin 1, 2022, 12:00 AM | 0 years 0 mons 0 days 0 hours 1 mins 58. - It accepts a “datePart” and a “field” as arguments. The date_trunc function truncates a TIMESTAMP or an INTERVAL value based on a specified date part e. 1. You may be misunderstanding what date_trunc does. for 00:00 to 07:29 minute will be round down to 00:00 and 07:30 to 15:00 will be round up to 15:00. created_at), 1) end) as Signup_Date. The difference between them is that the latter returns the same data type like timestamptz keeping your time zone intact. 2. 0. With PostgreSQL there are a number of date/time functions available, see here. The problem is, that I want to "date_trunc('month', start_date). The problem is you're selecting evt_block_time from the subquery, but the subquery no longer contains evt_block_time, it contains date_trunc('week', evt_block_time). date) going over the. Viewed 11k times. Extract isn't quite the same as date_trunc though. source must be a value expression of type timestamp, time, or interval. 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. 0. Thanks for the clarification. Use the below command: SELECT date_trunc ('week', timestamp'2021-08-23 19:14:20'); Postgresql date_trunc week. For types without common mathematical conventions for all possible permutations (e. CREATE OR REPLACE FUNCTION reset_Default () RETURNS VOID AS ' BEGIN TRUNCATE TABLE details; INSERT INTO details values ('car',2); INSERT INTO details values ('bus',4); RETURN; END; ' LANGUAGE 'plpgsql';. 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. 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. 8. Sorted by: 3. PostgreSQL: operator does not exist: timestamp without time zone == timestamp without time zone. This function helps in manipulating numbers as required. In PostgreSQL, DATE_TRUNC Function is used to truncate a timestamp type or interval type with specific and high level of precision. I created a postgres sql function which perform truncate and then insert rows into table. Postgresql: How to find hours between 2 dates and 2 times? 3. 5. Avoid this, if you can. For. Need group data by each line time interval, e. I'd suggest that you actually follow the advice from Postgres, rather than changing your data. 94. date_trunc('month', CURRENT_DATE) does not return the month, it returns a complete timestamp at the. 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. 19, earlier I have made the following Query SELECT DATE_TRUNC ('minute', some_date) FROM some_table; This was working. I'm a little confused about using trunc() function in postgresql. source must be a value expression of type timestamp, time, or interval. The exceptions are the MONTHS_BETWEEN function, which returns a number, and the ROUND and TRUNC functions, which do not accept timestamp or interval values at all. You may create an overloaded TRUNC function in Postgresql. The date_trunc function in redshift is specifically used to truncate the specified precision. 9. serpid = s. In PostgreSQL, DATE_TRUNC Function is used to truncate a timestamp type or interval type with specific and high level of precision. In other words we can use date_trunc for date values with a cast: Chapter 9. 299. 300 and 19:28:00. SELECT id, date , date_trunc('quarter', date - interval '2 month') + interval '2 month' AS quarter FROM player_daily_score;How DELETE and TRUNCATE work. PostgreSQL Date Functions (and 7 Ways to Use Them in Business Analysis) Facebook's Aha Moment Is Simpler Than You Think. The syntax of the LOCALTIME function is as follows:. This list of the. 9. 9. I am using the following query to change all date to the Monday of the corresponding week: select date_trunc('week', join_date) as join_wk from my_table This query converts 2017-08-23 11:30:02 to 2017-08-21 00:00:00SELECT (date_trunc('MONTH', now())+'1 month'::interval - '1 day'::interval);. 0. TO_UNIXTIME () – convert a regular date format into a unix time date. 1) precision The precision argument specifies fractional seconds precision of the second. If you have an index on some_timestamp and you search for date_trunc('day', some_timestamp) = DATE '2012-01-01', PostgreSQL can't use the index. How to import CSV file data into a PostgreSQL table. You can then convert it to whatever you want (decimal would be a good choice). 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). PostgreSQL 8. You might need to add explicit type casts. 3. Table 9. You can now use date_trunc (text, timestamp) with Doctrine! Note: You can easily adapt this code for every additional Postgres/MySQL function. 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. 8. 5. 2: date_trunc('hour', timestamp '2001-02-16 20:38:40') 2001-02-16 20:00:00:. It has the same effect as an unqualified DELETE on each table, but since it does not actually scan the tables it is faster. for example 2018-10-15 will be 2018-10-01 and 2018-10-30 also will be 2018-10-01. RPAD (‘ABC’, 6, ‘xo’) ‘ABCxox’. 876944') * 1000; would give. The result is 03 records. 76 1. TRUNCATE quickly removes all rows from a set of tables. 1. 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. ) field is an identifier or string that selects what field to extract. 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. 8. 30. Table 9-2 shows the available mathematical operators. I just sent a note about that to the pgsql-docs mailing list so hopefully it will be fixed soon. You may create an overloaded TRUNC function in Postgresql. ) field selects to which precision to truncate the input value. 1. 1. PostgreSQL dynamic date_trunc function rounding up exactly to given timestamp. Share. The TRUNCATE TABLE statement removes all rows from a table. In Postgresql, we can also add a year to the current date using the INTERVAL data type. The date_trunc() function in PostgreSQL is used to truncate a timestamp or interval value to a specified unit. Replicate Oracle's `TRUNC(DATE, 'WW')` behaviour in PostgreSQL. ) field selects to which precision to truncate the input value. That means that TRUNCATE can be rolled back just like any other. Postgres truncates trailing zeros for timestamps. postgresql时间差计算. (Values of type date and time are cast automatically to timestamp or interval, respectively. (Expressions of type date are cast to timestamp and can therefore be used as well. Return the relative rank of the current row. 7. orm: dql: datetime_functions: date_trunc: YOUR_BUNDLE_HEREDoctrineExtensionsDateTrunc. PostgreSQL specify that. For example: SELECT user_id FROM user_logs WHERE login_date >= '2014-02-01' AND login_date < '2014-03-01'. SELECT TO_CHAR(timestamp_column, 'YYYY-MM-DD HH24:MI') AS formatted_ts FROM table_name;. Note that some aggregate functions such as AVG (), MIN (), MAX (), SUM (), and COUNT () can be also used as window functions. –1 Answer. Mathematical Functions and Operators #. Code: SELECT TRUNC(67. In postgres, you could phrase this as: date_trunc ('quarter', current_date) + interval '3 months' - interval '1 day'. Tailing the logs on our CI server (Ubuntu 10. This query works except it does not return records for the dates (time_added) that bx_broker doesn't have data: select bx_broker as Broker, date_trunc ('day', time_added) as date, avg (bx_avgpxvsarrival) as AvgPr_vs_Arrival, avg (bx_avgpxvsoppvwapbpsblackrockasia) as. 9. created_at + interval (1 - day (u. 10. SELECT id, date , date_trunc('quarter', date - interval '2 month') + interval '2 month' AS quarter FROM player_daily_score; db<>fiddle here. the Use of the DATE_TRUNC () Function in PostgreSQL. date_trunc() Examples. BabaZuri. Sometimes you’ll need to specify what format the string is in through the function arguments. Simplify calculation of months between 2 dates (postgresql) 0. But I would like to shift the result to show last X. 0. century. source is a value expression of type timestamp or interval. Consider SQL Server function to calculate the difference between 2 dates in months: SQL Server : -- Difference between Oct 02, 2011 and Jan 01, 2012 in months SELECT DATEDIFF ( month, '2011-10-02', '2012-01-01') ; -- Result: 3. 9. Postgres has date_trunc which operates on timestamp or interval, and: Values of type date and time are cast automatically to timestamp or interval, respectively. The most frequently used Postgres date functions and business scenarios where they come in handy: Rounding off timestamps with DATE_TRUNC function. There is nothing wrong with using date_trunc under the right circumstances. 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.