Sorted by: 71. Here are the MSDN docs on addition and subtraction. Caveat: I work mostly with MS SQL and haven't worked with MySQL in a long time, so you may need to tweak the above. First, take the inner DATEDIFF portion. To specify common table expressions, use a WITH clause that has one or more comma-separated subclauses. MySQL is generally faster and more efficient than other relational database management systems (RDBMS), so it is. mysql> SELECT something FROM tbl_name-> WHERE DATE_SUB(CURDATE(),INTERVAL 30 DAY) <= date_col;. Adds a specified time interval to a DATE value. Subtracts a specified time interval from a DATE value. It is to be noted that periods are not date values. 3, “Date and Time Literals”. The AND operator displays a record if all the conditions separated by AND are TRUE. So we could modify the previous example so that TIMESTAMPDIFF. The TIMEDIFF () function calculates the difference between two TIME or DATETIME values. I would recommend using 365. com. MySQL - how to dynamically add columns with subquery in Select clause based on date range. Commonly used datepart units include month or second. Hope. October 10, 2023. For example, if DATETIMEDUE is 2014-10-19 23:59:59 and the current time is 2015-01-19 20:00:00, and you ask for the difference in months, the. g. Another simple way to cast the string to dateType in spark sql and apply sql dates and time functions on the columns like following : . To connect to a MySQL server with a command-line client, specify user name and password options as necessary for the account that you want to use: $> mysql --user=finley --password db_name. What I'am doing wrong The messure is the folowing YearMonths = VAR Days = DATEDIFF(max('produccion agency'[hire_date]),TODAY(),DAY) VAR Months = ROUNDDOWN(Days/31,0) VAR Years = ROUNDDOWN(Mo. For this, these must only be stored as permitted data values. ADO. Introduction to MySQL PERIOD_DIFF () function. It only returns the result in days. For a invalid date we will get Null as output. e. I have tried several date functions in both php and mysql,but failed in obtaining the exact result. Alternatively, for the difference between dates in minutes, hours, days, weeks, months, or years – SELECT TIMESTAMPDIFF (UNIT, `DATE-A`, `DATE-B`) FROM `TABLE`. (In our example, it’s the purchase_date column. START TRANSACTION; --statement1 UPDATE bankaccounts SET funds=funds-100 WHERE accountno='ACC1'; --statement2 UPDATE bankaccounts SET funds=funds+100 WHERE accountno='ACC2'; --statement3 ROLLBACK; --statement4. TIMEDIFF () is essential for time-based analysis by enabling you to measure the duration of events or actions. If you are looking for an integer number only then just cast it to. For example, I don't even remember if MySQL has the BIT datatype. e. 8494441'. MySQL provides several functions that you can use to perform calculations on dates, for example, to calculate ages or extract parts of dates. Date manipulation is done using the builtin date/time functions, which know how to convert inputs from the other formats. DEMO: Select date from Calendar to execute YEAR () →. This function is carried out by the authentication system. SQL Server Syntax DATEDIFF(datePart, date1, date2) The DATEDIFF() function in SQL Server has three required parameters:. You may use TIMESTAMPDIFF as the answer below shows, but you should avoid storing your timestamps as strings in the database. 1. It has a range of 1000 and 9999. The output is then either a. Let us walk through them quickly: To calculate the difference between dates in days – SELECT DATEDIFF (`DATE-A`, `DATE-B`) FROM `TABLE`. It's a. But for all other acceptable date/time column types, julianday() (and the other date/time functions) work fine with no modifiers,. The number of days is calculated using the MySQL DATEDIFF () function. When we have two Ys, then the last two digits of the year. If the date is NULL, the YEARWEEK () function will return NULL. 1. 4. The example above is simplified. This function is particularly useful when dealing with data that involves comparing or calculating differences between year-month intervals. MySQL - TIMESTAMPDIFF () Function. Datediff returns the number of days between two input dates. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. In this article, we learned how to do SQL subtract dates using the DATEDIFF function. To achieve this, we will utilize the MySQL DATEDIFF () function to calculate their ages: SELECT CONCAT (first_name, ' ', last_name) AS full_name, birth_date, FLOOR (DATEDIFF (CURRENT_DATE, birth_date) / 365) AS age FROM employees; In this query, the DATEDIFF () function calculates the number of days between the current date and the birth_date. SELECT YEAR ('2015-02-31') Output is NULL. ;. Used with %X. Improve this answer. i've tried. CREATE procedure [dbo]. 2. MySQL TIMESTAMPDIFF function is one of the Date methods, which is useful to find the interval difference between two dates or DateTime expressions. Supports some migration tools. fromDate)) / 12, 1) FROM TABLE t. MySQL Database: Restore Database. début)/365) Here is my table and the result in the 'montant_annuel' column: 14 Answers. DATEDIFF function accepts two input parameters i. DATE () Extract the date part of a date or datetime expression. Required. The date or datetime value to extract the year and week number from. def num_days_in_year (date: pd. Anjuman Anjuman. unix (1318781876); This is implemented as moment (timestamp * 1000), so partial seconds in the input timestamp are included. MySQL provides several functions that you can use to perform calculations on dates, for example, to calculate ages or extract parts of dates. In that case the real year difference is counted, not the rounded day difference. What I'am doing wrong The messure is the folowing YearMonths = VAR Days = DATEDIFF(max('produccion agency'[hire_date]),TODAY(),DAY) VAR Months = ROUNDDOWN(Days/31,0) VAR Years = ROUNDDOWN(Mo. I believe that I will need to do something along the lines of. The MySQL TIMESTAMPDIFF() function is used to find the difference between two date or datetime expressions. MySQL recognizes DATE , DATETIME, and TIMESTAMP values in several formats, described in Section 9. In other word, The MySQL PERIOD_DIFF () function is used to calculate the difference between two periods. Example: In this example, we will calculate a number of months between two specific dates using. 0. mysql> create table DateCreateDemo −> ( −> `Day` varchar(2), −> `Month` varchar(2), −> `Year` varchar(4) −> ); Query OK, 0 rows affected (1. In MySQL, you can use TIMESTAMPDIFF function. SELECT DATEDIFF ( CURDATE (), "2018-03-10" ); Both arguments are dates that you want to get the difference in terms of the number of days. Date with caution. release_date)/365. ) Week where Sunday is the first day of the week (01 to 53). SELECT * FROM `members` WHERE `membership_number` IN (1,2,3); Executing the above script in MySQL workbench. Share mysql> SELECT something FROM tbl_name-> WHERE DATE_SUB(CURDATE(),INTERVAL 30 DAY) <= date_col; The query also selects rows with dates that lie in the future. The datepart value cannot be specified in a variable, nor as a quoted string like 'month'. To count the difference between dates in MySQL, use the DATEDIFF (enddate, startdate) function. The DATEDIFF takes two arguments as shown in the example below: 1. In this. The DATDIFF function returns this difference as an integer value. And most of the time, this will require calculating the number of days between date values. I use $_POST in php to send this to a CHAR(6) field in MySQL How do I then simply echo the age (as of today, in years only) in 1) the same html window after the person types it in, and 2) in a separate html page by retrieving form data from MySQL?MySQL SQL MySQL SELECT MySQL WHERE MySQL AND, OR, NOT MySQL ORDER BY MySQL INSERT INTO MySQL NULL Values MySQL UPDATE MySQL DELETE MySQL LIMIT MySQL MIN and MAX MySQL COUNT, AVG, SUM MySQL LIKE MySQL Wildcards MySQL IN MySQL BETWEEN MySQL Aliases MySQL Joins MySQL INNER. MySQL 8. 0. ); These arguments can be date/datetime values, expressions. The following MySQL WHERE IN query gives rows where membership_number is either 1 , 2 or 3. MySQL DATEDIFF is used to find the difference between the specified dates. 날짜차이 계산하기 : DATEDIFF (e. Click Mapping and select the customer checkbox. unix (Number). We learned with examples, how to get information. Syntax:datediff function. 0. One way is to split it and pass into the constructor like this: let dob_string = "DOB: 14/09/2016"; let dl_string = "Download Date: 03/11/2020"; let dob =. Over the years, He has honed his expertise in designing, implementing, and maintaining data pipelines with frameworks like Apache Spark, PySpark, Pandas, R, Hive and Machine Learning. Follow. You need to pass the date expressions as arguments to the DATEDIFF () function: The. 47. MySQL is a leading open source database management system. Here is the main query to get the year part from MySQL date and time field. Enter a date format string that describes the Date2 parameter. Select Books. , begin is a DATE value and end is a DATETIME value. That is SQL Server syntax for converting a date to a string. 1. 60 sec) Insert some records in the table using insert. Parameter 1 - unit, it is a type of output you want, such as MICROSECOND, SECOND MINUTE, HOUR, DAY, WEEK, MONTH, QUARTER, YEAR. These changes are driven by the fact that technology is advancing (machines have more CPUS, use SSDs and so on), more data is being stored, MySQL is evolving (InnoDB, Group Replication, AdminAPI), and so on. According to the manual: DATEDIFF (expr1, expr2) returns expr1 − expr2 expressed as a value in days from one date to the other. Here is an example that uses date functions. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. Option 3. If you think that your Dates have a "format", then you're looking almost certainly at Character data, not proper Dates and, as you've discovered, trying to work. MySQL comes with many built-in functions that allow you to manipulate data. MySQL PERIOD_DIFF () returns the difference between two periods. The difference between startdate and enddate is expressed in days. Master the art of date and time manipulation in MySQL with essential functions like NOW(), DATE_SUB(), DATE_ADD(), and more. This function returns difference between the given date values in the form of days. There many different data types you can store in a MySQL table. 何かとデータが必要になる時に、日付指定とかと格闘することとなると思います。 少なくとも私は、毎度忘れては調べの繰り返しでした。 少しでも誰かのお役に立てたら幸いです。Discussion: To count the difference between dates, use the JULIANDAY() function, which counts the number of days since noon in Greenwich on November 24, 4714 B. PyMySQL is a pure-Python MySQL client library, based on PEP 249. If I'm understanding correct, you need only the days from the year of your second date. The BETWEEN operator selects values within a given range. The datepart argument can be microsecond, second, minute, hour, day, week, month, quarter, or year. The age computation takes into account leap years. To determine how many years old each of your pets is, use the TIMESTAMPDIFF () function. 4. 4. 5+. The next example will show the differences between two dates for each specific datapart and abbreviation. mysql> SELECT something FROM tbl_name-> WHERE DATE_SUB(CURDATE(),INTERVAL 30 DAY) <= date_col;. For up to date solution see jurkas' answer above. fin,NEW. Let us use the MySQL. It does seem to be smarter than a simple diff/365. The MySQL AND, OR and NOT Operators. The SQL ROUND () is used to round the value up to a specific decimal places. The query also selects rows with dates that lie in the future. The MySQL DATEDIFF function returns the number of days between two given dates. The YRDIF function can compute a person’s age. Apr 4, 2018 at 6:36. We would use the same transaction to debit ACC1 and credit ACC2 with a fund of $100. 0. MySQL DATEDIFF () returns the number of days between two dates or datetimes. This means that multiple references to a function. Functions that expect date values usually accept datetime values and ignore the time part. 引数は、結果を表す単位と、差異を取る 2. Introduction to MySQL DATE_ADD function. The time value can represent elapsed time as well. . Found this function, but it wont work. The function supports units of years, quarters, months, weeks, days, hours, minutes, seconds, milliseconds, microseconds, and nanoseconds. The server is accessible as a separate library that can be embedded into your applications to handle database commands. Returns datetime_expr2 − datetime_expr1, where datetime_expr1 and datetime_expr2 are date or datetime expressions. Where date_part can be any of the following: . Subtract column value from date in days or months. 2 Date and Time Datatype. 6. Functions that expect time values usually accept datetime values and ignore the date part. Obviously you could change this to a formatted output and have a scalar variable instead, but I'll leave that to you :-) EDIT:1. 3. Teams. If you omit the password value following the --password or . For example, if we want to know the difference between two dates in seconds: SELECT id, job, TIMESTAMPDIFF(SECOND, start_date, end_date) AS runtime FROM example_table; This calculates end_date - start_date in seconds. Learn more about CollectivesCurrently, my code just returns zero on the right side of the decimal place. Applies to: Databricks SQL preview Databricks Runtime 11. With two arguments, the sum of the arguments. How many days are there in a year? It's certainly not always 365. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. I don't have MySQL, so I can't test this, but I suspect that the time may be a factor. The date function used to returns the difference between two date or datetime values as a given unit of duration. However the documentation states nothing about the correctness of this or how it calculates the difference. The TIMESTAMPDIFF() function will then return the difference in the specified unit. One expression may be a date and the other a datetime; a date value is treated as a datetime. 2 Answers. Have a look at the TIMESTAMPDIFF() function in MySQL. So, you can use TIMESTAMPDIFF for your purpose. WARNING: An ideal function would be aware of leap years and days count in every month, but I found the. ) how to calculate mysql date diff between two dates excluding Fridays and Saturdays as Fridays and Saturdays are off days. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. if date is 09/25/2013, then we will pass 09252013 to the input box. Bahkan MySQL memiliki lebih dari 50 fungsi khusus berhubungan dengan tanggal dan waktu. SELECT year (dt2) FROM `dt_tb`. Specifically, it gets the difference between 2 dates with the results returned in date units specified as years, months days, minutes, seconds as a bigint value. mysqldiff is a Perl script front-end to the CPAN module MySQL::Diff which compares the data structures (i. We learned how to get work orders that took longer, get the oldest employees, the time between the. The DATE type is used for values with a date part but no time part. Another argument provides the unit for the result. Parameter 3 - End Date or Datetime Values. DATE_ADD () Add time values (intervals) to a date value. May 2, 2022 at 13:19. 2 Compare and Report Differences in Catalogs. 68 sec) Insert values for all fields using insert command. 000 which is the start of the. Find centralized, trusted content and collaborate around the technologies you use most. The first date is the later and the second is the earlier date (flipping them the other way around will return. using datediff with 1 decimal for years. 7 Reference Manual :: 12. You can do. The core of MySQL is the MySQL server. Optional. Q&A for work. Introduction to MySQL DATEDIFF () function. In MySQL, the PERIOD_DIFF () function finds the difference between the two periods. It ignores all the time part of the date in the calculation. Let us first create a table −mysql> create table DemoTable864(DueDateTime timestamp); Query OK, 0 rows affected (0. DATEDIFF: Returns the number of units (unit specified in Interval) between the input two dates. There many different data types you can store in a MySQL table. Instead, use YEAR without a display width, which has the same meaning. or, at least, none that you or I need worry about. 0. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. For example: Check in date is 12-04-2010 Check out date 15-04-2010 The day difference would be 3. If the value of basis is AGE, then YRDIF computes the age. This function takes two arguments: The end date. In SQL Server (Transact-SQL), the DATEDIFF function returns the difference between two date values, based on the interval specified. Takes three arguments, the start date. You use MySQL DATETIME to store a value that contains both date and time. Constructs a DATE value. In the above example, the CURDATE () function took the. Arguments. Stack Exchange Network. 2. Here's the expression that also caters for leap years: YEAR (date1) - YEAR (date2) - (DATE_FORMAT (date1, '%m%d') < DATE_FORMAT (date2, '%m%d')) This works because the expression (DATE_FORMAT (date1, '%m%d') < DATE_FORMAT (date2, '%m%d')) is true if date1 is "earlier in the year" than date2 and because in mysql, true. Seems like you solve all you need except the filter (WHERE) condition. For VB fans, you can reference the Microsoft. Let's look at some MySQL YEAR function examples and explore how to use the YEAR function in MySQL. . 7. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. This will collect the year part from the field. In PostgreSQL, you can take the difference in years, multiply by 12 and add. All functions can be used in both the load script and in chart expressions. Use DATEDIFF () to calculate the difference between two dates. MySQL には、年齢の計算や日付の一部の抽出など、日付の計算に使用できる関数がいくつか用意されています。. If you're using Unix Timestamp (integer), then it would be even easier: select * from MyTab T where UNIX_TIMESTAMP () - T. Description. The column value stands alone on one side of the inequality predicate (the <=) so mySQL can do an index range scan if you have an index on the column. This MariaDB tutorial explains how to use the MariaDB DATEDIFF function with syntax and examples. 5 Answers. 8. YYYYMM or YYMM. There should also be a YEAR(). MySQL provides a set of functio. mysql> select datediff(now(),'1997-09-09'); +-----+ | datediff(now(),'1997-09-09') | +-----+ | 4633 | +-----+ 1 row in set (0. I think this is what you need. It is a multiuser, multithreaded database management system. If the value of basis is AGE, then YRDIF computes the age. MySQL Database: Restore Database. mysql> SELECT DATE('2003-12-31 01:02:03'); -> '2003-12-31' DATEDIFF(expr1,expr2) DATEDIFF() returns expr1 − expr2 expressed as a value in days from one date to the other. In this page, we are going to discuss the usage of SQL ROUND () along with the SQL AVG () function. MySQL Transaction : A transaction is a logical unit of work that contains one or more SQL statements. . If you want use aggregation. Make sure to pass end date as first parameter and start date as second parameter to DATEDIFF function in hive. . Conclusion. Week where Monday is the first day of the week (01 to 53). Follow. $query="SELECT dt,dt2,year (dt) as year1,year (dt2)as year2, (year ( dt2 ) - year ( dt )) as difference FROM `dt_tb`"; $qt=mysql_query ($query); echo. dbForge Studio for SQL Server. The data type is a guideline for SQL to understand what type of data is expected inside of each column, and it also identifies how. The default is date format 1. Here is an example that uses date functions. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Second parameter would be the last login time, which is already in the database. Select datediff ( max (hire), min (hire)) as Difference From Employees Where terminated is null. it returns the difference in days if datepart is day. 24. For learning how to use DATEDIFF in MySQL, go to its tutorial here. B) Using DATEDIFF() function with table column example. Parameter 2 - Begin Date or Datetime Values. The DATEDIFF function has two arguments; we specify the dates for which we want to find the difference. Both integer (int) and big integer (bigint) are numeric data types used to store integer values. Consider there are 44 days between two dates. Syntax DATEDIFF ( date1, date2) Parameter Values Technical. Tutorial. MySQL DATEDIFF is used to find the difference between the specified dates. The date to be formatted. Datediff Function in MySQL Concept. , day, month, etc). The MySQL TIMEDIFF() function returns the difference between two time or datetime values. And you are trying to pass a formatted date string. MySql how to compare this years month to last years month? 3. This function takes only one argument – a date or date and time. The DATEDIFF () function calculates the difference in days between two DATE values. MySQL provides a set of functions to. The query also selects rows with dates that lie in the future. The age computation takes into account leap years. The MySQL DATEDIFF function returns the difference in days between two date values. Arguments. Say if 6 month. Since the question is being tagged for mysql, I have the following implementation that works for me and I hope similar alternatives would be there for other RDBMS's. fn_DateDiff_YMDMHS ('1900-01-01 00:00:00', '1910-10-05 03:01:02') You'll get this returned: Years Months Days Hours Minutes Seconds 10 9 4 3 1 2. Example. 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. Window functions are a key SQL resource. As you can't use date functions you're going to have to make up your own. 2425. In SQL Server, you can use DATEDIFF function to get the datetime difference in specified units. In MySql the syntax of DATEDIFF is different: DATEDIFF (date1, date2) and returns the difference date1 - date2 in days. DECLARE @Seconds INT = 50000000; --select @seconds = 896434 select [Running For] = CASE WHEN RADHE. 6222691' DECLARE @date2 datetime2 = '2022-01-14 12:32:07. Periods should be in the same format i. There are many ways to get current year from MySQL, you just have to extract it using YEAR () function like this: SELECT YEAR (NOW ()); NOW () returns todays date + time in this format 'YYYY-MM-DD HH:MM:SS' so with YEAR (), you're just taking the year value from NOW (). I also did some developments, but it is nothing comparing with Steven Hibble solution above. Connect and share knowledge within a single location that is structured and easy to search. startdate and enddate have to be in a format. DATEDIFF() is a function found in SQL Server and MySQL that calculates and returns the difference between two date values. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. MySQL can easily handle date arithmetic. e. 56 sec)Insert some records in the table using insert command −mysql> insert into. The two expressions don’t have to be of the same type. The query selects the starters whose "next review" date is today. 3. Can be one or a combination of the following values: Day of the month as a numeric value, followed by suffix (1st, 2nd, 3rd,. In MySQL, DATEDIFF function, takes only two arguments: end date and start date: DATEDIFF(NOW(), P. Each DateTime instance refers to a specific millisecond of the Unix epoch. The PERIOD_DIFF () function calculates the number of months between two periods in the format YYMM or YYYYMM. Using your sample: SELECT CASE WHEN datediff (year, date_column, getdate ()) > 1 THEN datediff (year. Improve this answer. 165k 23 23 gold badges 243 243 silver badges 282 282 bronze badges. PyMySQL works with MySQL 5. Use the number of seconds or minutes or whatever as a numeric variable: DF1 <- data. Skip to content. It uses the STR_TO_DATE () function and an algorithm for computing the age from the MySQL documentation: SELECT YEAR. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. SELECT DATEDIFF ("2020-11-20", "2020-11-1"); This last DATEDIFF example would display the difference between current system date and '2014-02-14' (current system date is returned by the CURDATE function ). (In our example, it’s the expiration_date column. As expected, the returned value is a numerical value from 1 to 31. DATEDIFF (datepart, startdate, enddate) which can return the difference in years, months, days etc. Set @monthDiff = ABS(DATEDIFF(MONTH, @FromDate, @ToDate)%12) Set @yearDiff = ABS(DATEDIFF(YYYY, @FromDate, @ToDate)) -- If the From date month is greater than the month of the To date and the year. number of seconds to years-months-weeks-days-HH:MM-SS. Interprets an INT64 expression as the number of days since 1970-01-01. 3. Return the difference between two time expressions: SELECT TIMEDIFF("13:10:11", "13:10:10");Have a look at the TIMESTAMPDIFF() function in MySQL. Function will return number of days between startdate and enddate. It can be one of the following formats: Year: year, yyyy, yy Discussion: Use the DATEDIFF () function to retrieve the number of days between two dates in a MySQL database. , with an example. Introduction to MySQL TIMEDIFF () function. frame (now, now2) sqldf ("select now2 - now as dif from DF2. 19, the YEAR (4) data type with an explicit display width is deprecated and you should expect support for it to be removed in a future version of MySQL. When one of your statements fails, you can undo all previous changes from the start of the transaction just by running the ROLLBACK statement. Here the returned results will be in months (either negative or positive) and two periods parameters used in this function should be in. I'm looking for a function that calculates years from a date in format: 0000-00-00. BETWEEN Syntax. answered Jan 27, 2011 at 22:04. For example, from 2/10/08 to 2/10/09 is considered one year, while 3/1/08 to 2/29/09 is considered zero years. The system calculates the number of complete years between the given dates. Here’s a quick rundown of the functions you can use in MySQL:. Sorted by: 0. The WHERE clause can be combined with AND, OR, and NOT operators. Here's the sql: Here's the sql: select YEAR(now()) - YEAR(dob) - ( DAYOFYEAR(now()) < DAYOFYEAR(dob) ) as age from table where. From the inputs you got there are 123 months between the date of 07/03/2011 to 24/3/2021. YEARS AS VARCHAR ) + ' Anni ' ELSE '' END + CASE WHEN. MySQL server uses the PASSWORD function to encrypt MySQL passwords for storage in the. MySQL Examples MySQL Examples MySQL Editor MySQL Quiz MySQL Exercises MySQL Certificate. Date Difference in MySQL to calculate age. Create function get_Exact_Date_diff (@date smalldatetime,@date2 smalldatetime) returns varchar (50) as begin declare @date3 smalldatetime Declare. Syntax DATEDIFF ( date1, date2) Parameter Values Technical. Returns the number of days from startDate to endDate. MySQL には、年齢の計算や日付の一部の抽出など、日付の計算に使用できる関数がいくつか用意されています。. From Datatypes In SQLite Version 3:. The various versions of MySQL supports. This function only calculates the date portion from each expression. Conclusion. 3; Jun 2009). 4. DATETIME - format: YYYY-MM-DD HH:MI:SS. MySQL TIMEDIFF () returns the differences between two time or datetime expressions.