It effectively calculates the difference in seconds and divides (discarding the fractional part) by the number of seconds in the chosen unit . TIMESTAMPDIFF in MySQL | Image by Author. 1. SELECT COUNT(pi. TIMESTAMPDIFF (interval，datetime1，datetime2. Select TIMESTAMPDIFF (SECOND, TIME (a. date_time 2011-04-25 17:22:41 2011-06-14 17:22:52. Calculate the time difference between two timestamps in mysql. use TIMESTAMPDIFF. 1 Answer. start, c1. Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand ; Advertising Reach developers & technologists worldwide; Labs The future of collective knowledge sharing; About the companyThis is out by a factor of 38. SELECT start, end, TIMESTAMPDIFF(HOUR, `start`, `end`) FROM table1 WHERE start >="2018-01-01" AND ende <= "2018-12-31 In this case I want only select the example 2. 抽出ロジックにミスがあり、特定のアクションをしてから 60 分後までにはお知らせが飛ぶ予定だったのですが、それが一部の条件で飛ばなくなっていました。 Use timestampdiff() to get the time difference, and curdate() to get today's date. The DATEDIFF() function calculates the number of days between parameter 1 minus parameter 2. DELIMITER ; CREATE TRIGGER default_time_trigger BEFORE INSERT ON TABLE_NAME FOR EACH ROW BEGIN IF (NEW. -1. elapse)/60 as diff from( SELECT c1. トラブルシューティング調査で、MySQLに構築したとあるテーブルのcreatedとmodifiedの差分計算をしたい時がよく. There are five data types in MySQL. Depending on your data and the max values, that may eliminate enough rows to make the non-sargable search "less painful". The TIMESTAMPDIFF function returns an estimated number of intervals of the type that is defined by the first argument, based on the difference between two timestamps. 今回は、「現在の日付」と「誕生日」の差分から、その「年数」を取得. mysql 将日期转换为毫秒数的mysql方法. The unit argument can be MICROSECOND, SECOND,. CREATE TABLE IF NOT EXISTS `login_user` ( `idx` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT, `client_id` INT(11) UNSIGNED NOT NULL DEFAULT '0', `login` DATETIME NULL, `Logout` DATETIME NULL, `Time` INT(11) AS (TIMESTAMPDIFF(second,`login`,`Logout`)), PRIMARY KEY (`idx`) ). In Oracle, MONTHS_BETWEEN(date1, date2) function returns the number of months between two dates as a decimal number. 13. Share. you can use mysql funcion timestampdiff like below. MySQL Examples MySQL Examples MySQL Editor MySQL Quiz MySQL Exercises MySQL Certificate. 7 or higher, to get the most out of this query, I'd recommend adding a. mysql> SELECT TIMESTAMPDIFF (MINUTE,'2003-02-01','2003-05-01 12:05:55'); -> 128885. 1. 在本教程中，您将学习如何使用MySQL IMESTAMPDIFF函数来计算两个DATE或DATETIME值之间的差值。. To calculate the difference between the timestamps in MySQL, use the TIMESTAMPDIFF (unit, start, end) function. Subtract column value from. combining date and time columns for query in codeigniter. Its arguments are the unit in which you want the result expressed, and the two. SELECT * from calls where TIMESTAMPDIFF (SECOND, setup, released) < 3600; First you have to create unit expression and extend it from BasicFunctionExpression for which take "SECOND" parameter as a unit and override its rendor (RenderingContext renderingContext). The third orders the. Return the difference between two time expressions: SELECT TIMEDIFF("13:10:11", "13:10:10");I think you want three keys in the order by: ORDER BY (remindDAteDIFf BETWEEN -70 AND 0) DESC, -- put these first (CASE WHEN remindDAteDIFf BETWEEN -70 AND 0 THEN remind_date END) ASC, status_updated DESC; The first key puts the "recent" values first. Take a look at the code below - notice the 1 millisecond difference in the two returned values. 2. I am facing a little confusion because of CURRENT_DATE value and CURRENT_TIMESTAMP value shows different date on MySQL. answered Feb 4, 2018 at 5:33. Only show hours in MYSQL DATEDIFF. DATEADD in Aurora MySQL only adds full days to a datetime value. objects. Mysql Timediff function is not working for me for long date. dtime,'2022-08-16 04:30:58') These two. The DATE, DATETIME, and TIMESTAMP types are related. *, timestampdiff (minute, start_time, end_time) as minutes from t; You can incorporate this into a view, if you want it readily available: create v_t as select t. -4 minutes, -6 minutes, -10 minutes when should be positive. Documentation of MySQL tells that . This is because the UNIX_TIMESTAMP () function fails for DATEs before 1970-01-01 (and for dates in the far future using 32 bit integers). 2. So, What you can do is that you can use TIME_TO_SEC (TIMEDIFF (r. If TIMESTAMPDIFF () returns NULL, we can find rough age by subtracting the current year from the year of birth. MySQL では セクション11. Syntax Is there a TIMESTAMPDIFF() equivalent for PostgreSQL? I know I can subtract two timestamps to get a postgresql INTERVAL. 🥝 MySQL 시간 차이 계산하기 (TIMESTAMPDIFF 함수) ⌛ Problem 쿼리를 작성하다 보면 시간 차이를 활용해야 하는 경우가 존재합니다. The schema is SYSIBM. 2022/11/26. 04 I created also a function, but without adding microseconds, because MySQL 5. Unfortunately, that usually yields the value SYSTEM, meaning the MySQL time is governed by the server OS's time zone setting. How can I fix it? SELECT IF(TIMESTAMPDIFF(YEAR, '2017-10-13 16:57:27', NOW()) > 0, CONCAT( Stack Overflow. This seems to work for all the dates I throw at it. for more on date functions MySQL documentation. 7 Date and Time Functions. 2. birth)) / 365. (I'm using MySQL 5. select date1, date2,timestampdiff(YEAR,date2,date1) from so7749639. 1. Here’s a basic example: SELECT TIMESTAMPDIFF(SECOND, '2020-05-06 01:00:00', '2020-05-07 02:00:00') as time_difference; In this SQL statement, TIMESTAMPDIFF is the function we’re using to calculate the difference. Note: If there are specified two arguments with this function, it first adds the second argument to the first, and then returns a datetime value. curdate() 関数が文字列または数値のどちらのコンテキストで使用されているかに応じて、現在の日付を'yyyy-mm-dd'または yyyymmdd 形式の値として返します。. If you want to read about CONVERT () and CAST () here is the link. Share. If you are experiencing this bug, a good alternative is to use TIMESTAMPDIFF and then get the sum of the column you create. 1. It adds verbosity to the query and actually slows it down (because MySQL materializes such subqueries). In any case, you want to take the difference in a smaller time unit and convert to days. Returns the interval from datetime_expr2 to datetime_expr1. The STR_TO_DATE () function scans the input string to match the format string. Sorted by: 4. Its arguments are the unit in which you want the result expressed, and the two dates for. SELECT start, end, TIMESTAMPDIFF(HOUR, `start`, `end`) FROM table1 WHERE start >="2018-01-01" AND ende <= "2018-12-31 In this case I want only select the example 2 entry. Below is the example that returns a difference of two date values, 2020-03-01 and 2020-03-10, in days: Query: select timestampdiff(day,'2020-03-01', '2020-03-10') AS result; Output: MySql version >=5. Something like that : UPDATE table SET newcolumn = TIMESTAMPDIFF (HOUR,col1,col2); Something like that. MySQL. 9, spring-boot-2. In your case, it returns the hour difference between the two dates. I am working on migrating functions from SQL Server 2000 to MySQL. MySQLのTIMESTAMPDIFF ()関数を使うと、日時同士の差分計算がしやすくて便利. inner join orders_products on. Improve this question. . UNIX_TIMESTAMP is seconds seconds since '1970-01-01 00:00:00' in UTC. modified) Reference:. The MySQL ADDDATE () function is used to add a specified time interval to a given date and return the resulting date value. So you need to either. The TIMESTAMPDIFF () function will then return the difference in the unit specified. SELECT * FROM tableName WHERE TIMESTAMPDIFF (MINUTE,timestamp,NOW ()) < 10. 返回值. SELECT * FROM tableName WHERE now () - interval 10 minute < stored_timestamp. +1 for to the point the stored timestamp is less than x minutes. TIMESTAMPDIFF(HOUR, '2018-06-01 00:00:00', '2018-06-01 12:00:00') Share. Teams. Note that unit values can be different in SQL Server DATEDIFF and MySQL TIMESTAMPDIFF. Here is my trigger: SET NEW. TimeStamp1,t2. MySQL version: 5. SELECT * FROM tableName WHERE TIMESTAMPDIFF (MINUTE,timestamp,NOW ()) < 10. Usually I'd just use 'TIMESTAMPDIFF ()' but this time I need to get the minutes from 9am until 22pm, of. You will be doing a full table scan; You are literally performing data subtraction on every rowIt is a bad idea to use some operations on the index field. [EDIT] If you want "everything that is greater than 4" to just be a single group, then you have to transform the values 5, 6, 7, . NET. The function is valuable for filtering records or data based on time criteria, such as selecting records within a specific time range. `time` IS NULL) THEN SET NEW. So we could modify the previous example so that TIMESTAMPDIFF. We. 抽出ロジックにミスがあり、特定のアクションをしてから 60 分後までにはお知らせが飛ぶ予定だったのですが、それが一部の条件で飛ばなくなっていました。Use timestampdiff() to get the time difference, and curdate() to get today's date. 0. TIMESTAMPDIFF not working on mysql query in codeigniter. 2,964 3 3. The value is expected to be the result of subtracting two timestamps and converting the result to CHAR. I want to return the number of minutes between the start and the end (End is always after than Start). Sorted by: 0. 6 timestampdiff problem with return result. TIMESTAMPADD(HOUR, TIMESTAMPDIFF(HOUR,CURDATE(),timestamp_column_name), CURDATE()) Instead of CURDATE() you can use an arbitrary date, for example '2000-01-01' Not sure if there could be problems using CURDATE() if the system date changes between the two calls to the. The following syntax works on MySQL 5. The TIMEDIFF () function calculates the difference between two TIME or DATETIME values. The below statement worked in SQL Server fine. A YEAR doesn't have the day of year in it, so it's not possible to calculate the difference with a date. I just want the difference between the two timestamps in in hours represented by an INT. What i would like to do is only count the hours that occur during the week, so lets say DATE1 is friday at 9am,. If it helps someone who knows MySQL answer, SQL Server isn't "rounding up"; SQL Server just counts the number of day boundaries between the two times. In a Unicode database, if a supplied argument is a. SELECT TIMESTAMPDIFF(HOUR, UTC_TIMESTAMP(), NOW()); If the server's timezone is PST this will return -8. Get the current date as timestamp and get the DATE_ADDED column value as timestamp and after that. A list of format specifiers given bellow may be used to format a date. However. g. This function takes the difference between two dates and shows it in a date format yyyy-mm-dd. In each table definition, the first TIMESTAMP column has no automatic initialization or updating. I guess the knowledge and computation effort needed to take DST into account is a waste of time because the returned value cannot be exact (except when the unit is SECOND). 1 Answer. To get the difference in seconds as we have done here, choose SECOND. 目次. 3, “Date and Time Literals”. MySQL AVG of TIMESTAMPDIFF function with WHERE CLAUSE. What happens with the code above is basically, on the sub-query a we calculate all of the timestampdiff function for each unit. This is because the UNIX_TIMESTAMP () function fails for DATEs before 1970-01-01 (and for dates in the far future using 32 bit integers). Both of the queries below will return a value of 1, representing "1 day", where one is a difference of 8 hours, the other is a difference of 46 hours: SELECT DATEDIFF ('2013-01-15 07:00','2013-01-14 23:00'). USE TIMESTAMPDIFF MySQL function. Description: The manual mentions FRAC_SECOND only for the TIMESTAMPADD() function: TIMESTAMPADD(unit,interval,datetime_expr) Adds the integer expression interval to the date or datetime expression datetime_expr. time1: The first TIME or DATETIME value. If you're running MySQL 5. Scenario : 1) User calls API from Lumen backend to insert data on a table. 날짜 검색 mysql에서 날짜 범위를 검색하는 데는 크게 세 가지 방법이 있습니다. Use this link to know how to get accurate result using EXTRACT () and JULIAN_DAY () function. 2. You can use TIMESTAMPDIFF which returns the difference datetime_expr2 - datetime_expr1 in years, months, days etc. timestamp_end), TIME (a. Note: By selecting the employees’ full names using the CONCAT() function, we can easily identify whose age we are looking at. Simple but elegant. Also the sign of the method change but works on both H2 and My. date_created = MIN (u. Here’s the syntax of the. You can use this to get integer value. TimeStamp1, t1. MySQL DATEDIFF: Calculate Days Between Two Dates. Improve this answer. 摘要：在本教程中，您将学习如何使用 MySQL TIMESTAMPDIFF函数来计算两个DATE或DATETIME值之间的差异。. Oracle also dont support NOW() function in mysql. TIMESTAMPDIFF (SECOND, NOW (),q. If TIMESTAMPDIFF () returns NULL, we can find rough age by subtracting the current year from the year of birth. I have two rows. It seems that two TIMESTAMPDIFF fucntion calls with same datetime expr parameters on `where` clause will return same result although they have different unit parameter. timestampdiff () requires valid dates for the second and third argument. datetime difference shows wrong values in mysql. Use this version: CONCAT ( TIMESTAMPDIFF (day, TIME_START, TIME_END), 'd ', MOD (TIMESTAMPDIFF (hour, TIME_START, TIME_END), 24), 'h ', MOD (TIMESTAMPDIFF (minute, TIME_START,. 5 Date Calculations. Hi I tried the following: timediff(`date2`, `date1`) which gives me the time difference but if the days are different it does not account for the day difference. MySQL has a built-in function. mysql timestampdiff() ignoring weekends. There are 2 things to check: Make sure you handle the case where sent_datetime is null, because otherwise TIMESTAMPDIFF will return NULL. MySQL TIMESTAMPDIFF函数简介. datetime) - JulianDay(students. May 2, 2022 at 13:19. 3. SELECT timestampdiff (minute,created_at,now ()) AS TIMEDIFF. 단순히 일 차이를 가져올 때 사용하는 것이 datediff 함수입니다. Oracle also dont support NOW() function in mysql. One expression may be a date and the other a datetime; a date value is treated as a datetime having the time part '00:00:00' where necessary. If I am missing anything let me know. approved_on, slot. Converting date/time string to unix timestamp in MySQL. 2022/11/26. Hot Network Questions What is the best term for species that originated on other planets?The MySQL TIMESTAMP is a temporal data type that holds the combination of date and time. 6. 下面说明了TIMESTAMPDIFF函数的语法。. dtime, '2022-08-16 04:30:58') TIMESTAMPDIFF (MINUTE, u. The result returned by TIMEDIFF() is limited to the range allowed for TIME values. I replaced the LEFT JOIN. Posted on June 20, 2019 by Ian This article looks at the difference between the MySQL TIMEDIFF () and TIMESTAMPDIFF () functions. 0. *, timestampdiff (second, startdate, submittedon) / (24 * 60 * 60) as days_with_fraction from t; Yes, that question was closed by misunderstanding. All you need is to execute the code below and then use the function. startTime, r. If you want to find the date/time difference between the first and the last timestamp of each ticket, there are several functions that can help you: select ticket_id, timediff (max (timestamp), min (timestamp)) as diff, timestampdiff (hour, min (timestamp), max (timestamp)) as diff_in_hours, timestampdiff (minute, min (timestamp), max. 誕生日から年齢を取得するには、TIMESTAMPDIFF () 関数を使用します。. The argument order and syntax is also different. All this is doing is running a calculation on two fields in your data. MySQL timestampdiff function with examples is given below: 1. g. Param1, t2. CREATE TABLE `contract` ( `id` int (11) NOT NULL AUTO_INCREMENT, `emp_id` int (11) DEFAULT NULL , `sign_time` datetime DEFAULT NULL , `end_time` datetime DEFAULT NULL , PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 ; CREATE TABLE. 1. 0] Information in this document applies to any platform. MICROSEGUNDO,. If you have a number of milliseconds since the Unix epoch, try this to get a DATETIME (3) value. The TIMESTAMPDIFF () function's 2nd and 3d arguments are datetime expressions and the 2nd is subtracted from the 3d. Ask Question Asked 7 years, 1 month ago. SELECT Dog_Guid, start_time, end_time, TIMESTAMPDIFF (MINUTE, start_time, end_time) AS Duration from exam_answers where TIMESTAMPDIFF (MINUTE, start_time, end_time) > 0 order by duration desc limit 10. elapse)/60 as diff from( SELECT c1. The function is valuable. TIMESTAMPDIFF(MINUTE,T. "timestamp" is a column in MYSQL which I hold a timstamp as such "1365793346". MYSQL TIMESTAMPDIFF function is not working. unit – Denota la unidad para el resultado. date_created) ) s. 株式会社オズビジョンのユッコ (@terra_yucco) です。今日はトラブル対応中に出くわした MySQL の小ネタ。 トラブルの内容. SQL Server: -- Get difference in days SELECT DATEDIFF(dd, '2022-09-01', '2022-09-05'); # 4SELECT TIMESTAMPDIFF (YEAR, YOUR_COLUMN, CURDATE()) FROM YOUR_TABLE AS AGE Check the demo image below. scheduled_date_time) END as "Days Ahead", CASE WHEN slot. As you see, it expects the parameters to be of type. The STR_TO_DATE () function may return a DATE , TIME, or DATETIME value based on the input and format strings. id - 1) order by a. mysql timestampdiff() 函数返回两个日期/日期时间之间的时间间隔。But, I don't know how am I supposed to do it in MySQL, I found this article Count days between two dates, excluding weekends (MySQL only). TIMESTAMPDIFF (DAY, '2011-12-10', '2011-12-20') will return 10. Mysql TIMESTAMPDIFF for time datatype return negative value. I was reading the 8. TIMESTAMPDIFF () 函数将计算两个日期或日期时间表达式之间的整数时间差。. I have my SQL statement like this trying to get the difference in 2 timestamps greater than 10 minutes. 1. EDIT The example abovee works only on mysql databases. For example: CREATE TABLE t1 (t TIME (3), dt DATETIME (6)); The fsp value, if given, must be in the range 0 to 6. The function returns the result of subtracting the second argument from the third argument. Dec 18, 2014 at 6:32. timestamp off by minutes. Both functions do a similar thing, but. Subtracts the 2nd argument from the 3rd (date2 − date1). I can do this in MySQL like this: TIMESTAMPDIFF(HOUR, links. The schema is SYSIBM. 0. MySQL convert timediff output to day, hour, minute, second format. current_date および current_date() は curdate() のシノニムです。Use TIMESTAMPDIFF for exact number of hours : SELECT b. One column used CURRENT_DATE (sales_date) as insert value and one column use CURRENT_TIMESTAMP. 1 Answer. Stack Overflow. TIMESTAMPDIFF(unit,datetime_expr1,datetime_expr2) Returns datetime_expr2 – datetime_expr1, where datetime_expr1 and datetime_expr2 are date or datetime expressions. Puede ser uno de los siguientes. mysql> SELECT. 0), 1) AS "Worked Hours" FROM `db_foo` WHERE matriculation='X' AND date='2017-yy-yy'; which would return. Like for example the conversion value to Hours and Minutes is 4 Hours and 30 Minutes. Weeks, quarters, and years follow from that. session_ID LEFT JOIN composer_sessions ON sessions. TIMESTAMPDIFF(unit,begin,end); TIMESTAMPDIFF函数返回begin-end的结果，其中begin和end是DATE或DATETIME表达式。. Seperti DATE_SUB, DATE_ADD, TIMESTAMPDIFF dan MAKEDATE. Share. Using TIMESTAMPDIFF : NOTE:- Following Assumptions are made for TIMESTAMPDIFF () function. If the returned value is 5 , the. end_date) <= 0 can be optimized by changing to to q. The tables differ in how the ts1 column handles NULL values. 7. YEAR ('2015-01-01') returns 2015, which is not a valid date, which breaks timestampdiff () causing it to return NULL. 0. 1 Answer. 2 Answers. La versión SYSFUN de la función TIMESTAMPDIFF continúa estando disponible. The following question will answer your question: "can. SELECT DATEDIFF(wk,'2012-09-01','2014-10-01') AS NoOfWeekends1 The equivalent query of in mysql uses timestampdiff() instead of datediff and gives the output as 108. TIMESTAMPDIFF - How to use it in. MySQL: TIMESTAMPDIFF() condition having no effect. 0. 25. Introduction to MySQL TIMEDIFF () function. Improve this answer. James James. Yang berbeda adalah penggunaan fungsi yang berbeda. transaction_date)) AS average FROM ( SELECT u. Here is an example that uses date functions. For example: Check in date is 12-04-2010 Check out date 15-04-2010 The day difference would be 3. created, NOW())Here is an example that uses date functions. 0 version, Analytics1901 to 2155. MySQL – TIMESTAMPDIFF() Function The DATE, DATETIME and TIMESTAMP datatypes in MySQL are used to store the date, date and time, time stamp values respectively. 如果使用 DATE 值，则. I was wondering how - is done between two timestamps and what the unit is. 0. 0. The link above have helped me how to calculate difference in two dates, however, I need to do the same on a particular column at run time via MySQL select query inside PHP. 예를 들어 예약시간 30분 전에는 예약을 불가능하도록 막아야 한다거나 특정 이벤트일이 현재부터 얼마나 남았는지 등등의 경우가 존재할 것입니다. date_picked_begin,. Note: You need to pass two date / datetime values along with the unit (eg, day, month, etc. So the function is returning the difference between the second and third parameters in the units defined by the first parameter. 0. MySQL TIMEDIFF () function. However the MySQL documentation offers a very simple solution: SELECT TIMESTAMPDIFF (YEAR, dob, CURDATE ()) AS age. Functions that expect time values usually accept datetime values and ignore the date part. 0. Solution is using select timestampdiff(DAY, '2016-04-13 11:00:01', '2016-04-14 11:00:00'); (note the opposite. But the output I get is 1 (day). Here is an example that uses date functions. I have a MYSQL table with a TIMESTAMP column 'Start' and a TIMESTAMP column 'End'. heres a bulk solution that i just developed using my date dimension table it allows start and end to be during a weekend. 0. You can specify MONTH as the unit in the first parameter: SELECT TIMESTAMPDIFF(MONTH, '2012-05-05', '2012. Here’s the syntax of the TIMESTAMPDIFF function: TIMESTAMPDIFF (unit, begin, end ); Code language: SQL (Structured Query Language) (sql) In this syntax: begin. timestampdiff Description. SELECT * FROM tableName WHERE now () - interval 10 minute < stored_timestamp. I am struggling making sense of the TIMESTAMPDIFF () function using MYsql. Here expr2 is greater than expr1, so the return value is positive. Get your own SQL server SQL Statement: Edit the SQL Statement, and click "Run SQL" to see the result. 🔸 Let’s take a practical example — you want to see all the earthquakes which happened within 10 days from 2nd January 1965 and had magnitude more than 6. The function returns the result of subtracting the second argument from the third argument. 7:. SELECT name, SUM(TIMESTAMPDIFF(MINUTE,starttime,endtime)-idletime) FROM gc_sessions JOIN gc_users ON gc_user. Where a time stamp is a numerical value representing the number of milliseconds from '1970-01-01 00:00:01' UTC (epoch) to the specified time. 使用unix_timestamp()函数 TIMESTAMPDIFF(unit,datetime_expr1,datetime_expr2) Description. 0. The two expressions don’t have to be of the same type. It accepts two TIMESTAMP or DATETIME values (DATE values will auto-convert in MySQL) as well as the unit of time we want to. timeDiff), MINUTE(x. You may use TIMESTAMPDIFF as the answer below shows, but you should avoid storing your timestamps as strings in the database. For example: Profile table: Name; Gender; DOB. DATEADD. The common uses of MySQL ADDDATE () function -. 日付の「比較」「加算」「差分」「抽出」など利用例を交えて解説します。. MySQL TIMESTAMPDIFF函数简介. To calculate the difference between two date/datetime expressions, use TIMESTAMPDIFF. You are basically going to drive mysql crazy because of how the query gets evaluated. If you are experiencing this bug, a good alternative is to use TIMESTAMPDIFF and then get the sum of the column you create. use TIMESTAMPDIFF. I have tried to used timestampdiff, but it takes three arguments. user_id HAVING u. time2: The second TIME or DATETIME value. Functions. expresión-numérica. When using such tools, we can clearly see that int and double does not auto generate a default value to it, but timestamp. As the previous example demonstrates, the TIMESTAMPDIFF () allows you to specify a unit for the results to be returned as (in fact, it requires you to specify the unit). Use TIMESTAMPDIFF function to calculate the minute difference between the login_datetime and MySQL begin_datetime '1000-01-01 00:00:00'; Divide the calculated minute difference by 15In MySQL, the way to do that is to employ the DATEDIFF() function. Except for the day, they all calculate correctly. TIMESTAMPDIFF. or a combination of TIMESTAMPDIFF (YEAR) and then MONTH AND DAY and deduct the months by the value of YEAR * 12 and DAY by YEAR * 365 AND. See the syntax, parameters,.