Like the. Use TIMESTAMPDIFF instead. TIMESTAMPADD() – Add or subtract an interval from a timestamp or date. Same for SQL Server 2005-2012: SELECT DATEDIFF(day,valid_from,last_modified_date ) AS 'days' FROM table This will. The result returned by TIMEDIFF() is limited to the range allowed for TIME values. 03 sec) You may. one of the following could be used when comparing dates in MySQL: DATEDIFF () Subtract two dates TIMEDIFF () Subtract time TIMESTAMPDIFF () Subtract an interval from a datetime expression PERIOD_DIFF () Return the number of months between periods. Only the date parts of the values are used in the calculation. MySQL TIMEDIFF () function. If values of seconds are greater than zero, a decimal number may be produced. UNIT can be SECOND MINUTE HOUR DAY WEEK. The goal here is basically too add 15 seconds or reset the date to where only 15 seconds are left. Alternatively, for the difference between dates in minutes, hours, days, weeks, months, or years – SELECT TIMESTAMPDIFF (UNIT, `DATE-A`, `DATE-B`) FROM `TABLE`. date2: This is the second date that you want to compare. This function only calculates the date portion from each expression. Share. should work fine. Learn MySQL Tutorial. This function accepts three parameters − the type of interval to measure (such as year, quarter, month, hour, minute, etc. SQL Server Syntax DATEDIFF(datePart, date1, date2) The DATEDIFF() function in SQL Server has three required parameters:. To get the number of seconds between two dates, the TO_SECONDS() function can come in handy, for. Only show hours in MYSQL DATEDIFF. The SQL DATEDIFF () function returns a long value specifying the number of time intervals between two specified dates . The datepart. The output is in hours:min:sec. I just downloaded the nuget packages for entity framework 6 (EntityFramework. SELECT * FROM table WHERE TIMESTAMPDIFF (MINUTE,timestamp,NOW ()) AS thisisit. Both integer (int) and big integer (bigint) are numeric data types used to store integer values. SELECT. That is a 5 hour difference. Share. Description. But, in that query I have to give condition like I want to show result like less than 10 minutes or less than 15 minutes only . For this, these must only be stored as permitted data values. so if date2 is yesterday and date1 is today it will provide something like this: 00:00:07 I saw the timestampdiff function a couple of times, but I am using MySQL in Domo, and this. minute uses the hour and minute. I've a query in MySQL that is returning the difference between two datetimes. You can do. If, by mistake, you pass the second date value as a value larger than the first, you’ll get a negative value for the date difference. Here is sample. Difference between two dates returned in. SELECT mytable. Note, that since DATEDIFF returns an integer value, the result also will be an integer. This DATE () is used to handle Date efficiently. Return the current time. The syntax for DATEDIFF is pretty straightforward: DATEDIFF (datepart, startdate, enddate) Let’s explore the parameters used here: datepart: The unit of time you want to use for the calculation, like year, quarter, month, day, or even smaller units like hour, minute, or second. Apr 4, 2018 at 6:36. Date arithmetic in MySQL is quite flexible. It calculates by the second. Syntax DATEDIFF ( date1, date2) Parameter Values Technical. Quick Example: -- The difference is days between today and yesterday SELECT DATEDIFF (dd, GETDATE () - 1, GETDATE ()); -- Returns: 1 -- The number of seconds in 24 hours. 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 ). Currently I am only returning 1. fin,NEW. DateDiff to show Minutes and Seconds. If you wanted to avoid SEC_TO_TIME (seconds), you can build up the string yourself. I need, in SQL to convert this result. 2 days. 4 Answers. mysql> SELECT TIMESTAMPDIFF (MINUTE,'2003-02-01','2003-05-01 12:05:55'); -> 128885. g. Share. 0 The documentation for DATEDIFF is available on MSDN:DATEDIFF: . The TIMEDIFF () function returns the difference between two time/datetime expressions. Now it only runs DateAdd () once, and it can use an index (if one exists), to only load the rows that match the predicate criterion. How can I omit the seconds? mysql; time; Share. DATEDIFF() – Return the difference in days of two date values. To define a column that includes a fractional seconds part, use the syntax type_name ( fsp) , where type_name is TIME , DATETIME, or TIMESTAMP, and fsp is the fractional seconds precision. Share. It can be one of the following formats: Year:. MySQL. in the image odate is the start date and edate is the end date. MariaDB: DATEDIFF Function. You can even find the number of hours, minutes, seconds, and so on in terms of details in. In PostgreSQL, you can take the difference in years, multiply by 12 and add. 0. MySQL DATEDIFF () returns the number of days between two dates or datetimes. The syntax for the DATEDIFF function is as follows:. MySQL DATEDIFF() With Negative Days Difference. date2: The second date value you want to compare. Note if you want to count FULL 24h days between 2 dates, datediff can return wrong values for you. In MySQL, DATEDIFF function, takes only two arguments: end date and start date: DATEDIFF(NOW(), P. Until now, I've discovered timediff function. MySQL DATEDIFF() With Negative Days Difference. For example the following statement produces 99. It outputs the number of days between two dates. If NULL means "never qualifies", use a dummy date that will always disqualify it. MySQL TIMEDIFF () returns the differences between two time or datetime expressions. MySQL 将timediff输出转换为天、小时、分钟、秒的格式 在MySQL中，timediff函数用于计算两个时间之间的差异。当我们使用timediff函数后，它将返回一个时间差，并以时、分、秒格式表示。但是，有时候我们需要将时间差转换为更易读的格式，例如天、小时、分钟和秒。The DATEDIFF function takes two arguments, both of which are date / time stamps and gives the number of days between them. SELECT id, job, TIMEDIFF(end_date, start_date) AS runtime FROM example_table; Like TIMESTAMPDIFF, this calculates end_date - start_date, but note that the date parameters are called in the opposite order. 33 sec)Insert some records in the table using insert command −mysql> insert into DemoTa DATETIME if the first argument is a DATETIME value or if the interval value has a time element such as hour, minute, second, etc. I believe you want: Select id, datediff (day, min (hire) max (hire)) as Difference From Employees group by id having count (terminated) < count (*) -- at least one NULL value. Syntax : DATEDIFF ( datepart , startdate , enddate ) You should use TIMEDIFF() or TIMESTAMPDIFF() function. When analyzing historical data, DATEDIFF () helps quantify the time. it returns the difference in days if datepart is day. I like the idea of making this into a function so it becomes re-useable and your queries become much easier to read:--get the difference between two datetimes in the format: 'h:m:s' CREATE FUNCTION getDateDiff(@startDate DATETIME, @endDate DATETIME) RETURNS VARCHAR(10) AS BEGIN DECLARE @seconds INT =. If you want the result in hours you should use Timestampdiff. Date DateAdd DateDiff DatePart DateSerial DateValue Day Format Hour Minute Month MonthName Now Second. It shows us that there are 36 hours, 15 minutes, and 35 seconds between the two. 171 2 3. recordDate, w2. 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. I have two columns that have time data that looks like "2017-12-06 18:50:27 +0000" . The hour, minute, secondarguments can hold only the legal values 0-59 for minute, second; It returns a. What this is doing is taking the current seconds left from the 'end_dt' subtracting 15 and adding it to the 'end_dt', basically giving you 15 seconds left. You can use DATEDIFF(MINUTE, StartDateTime, EndDateTime) / 60. DATE () Extract the date part of a date or datetime expression. It can also be a date string or a date value in a column of a table. I've been busy with this for hours, but I cant get it to work. 103 of the German Basic Law forbid a second trial after an acquittal?YEAR. For example to check if two datetimes are between 10 seconds of each. DECLARE @date datetime SELECT @date = '2/11/1990 12:03:25. )) transform seconds into time with SEC_TO_TIME:. This MySQL tutorial explains how to use the MySQL DATEDIFF function with syntax and examples. bash. The syntax goes like this: TIMEDIFF(expr1,expr2) Where expr1 and. 000' Set @clockout = '2015-01-03 12:02:42. In Oracle, you can simply subtract two dates and get the difference in days. This is alright as DATEDIFF() supports a negative date difference. 0. DATE is used to store the value of the date. datediff() 関数は、2つの日付の差を求める関数です。 第1引数の日付の方が大きければ正の値が返ります。 datediff()を使うと、想定通りの結果が取得できました datediff()関数の実行結果の具体例. DATEDIFF accepts either the full name of the datepart, or any listed abbreviation of the full name. I have two dates date column like '2017-12-29' and '2018-01-05' the datediff between these dates is 8, but i want to know the datediff which fall on 2018 which should be 5. for more on date functions MySQL documentation. Date). Here, you'd like to get the difference in seconds, so choose second. Only return data type is. To calculate the difference between the arrival and the departure in T-SQL, use the DATEDIFF (datepart, startdate, enddate) function. DATE_ADD () Add time values (intervals) to a date value. SQL 教學. SELECT DATEDIFF (YY,'01/02/2011 15:00:00','01/01/2016 14:00:00') 5. The datepart argument can be microsecond, second, minute, hour, day, week, month, quarter, or year. value addunit – Here the value is the date or time interval to add. Below is an example with 2 queries with the same results. HTH. It is important to understand that the DATEDIFF function is both reliable and valid in both cases. learn mysql. 0. Date DateAdd DateDiff DatePart DateSerial DateValue Day Format Hour Minute Month MonthName Now Second Time TimeSerial TimeValue Weekday WeekdayName Year Other Functions:. millisecond uses the hour, minute, second, and first three digits of the fractional seconds. randombits randombits. MySQL's built in cache really makes this question moot for most of the day, but the very first time the following query is run, the performance is terrible: Taking over 300 seconds the first time whereas subsequent querying can complete in milliseconds. However I want the output to be. 000. Modified 2 years, 2 months ago. Here is an example that uses date functions. The database contains its start time and its end time. For this, these must only be stored as permitted data values. 0. 03 sec) You may. This will give you the number of hours in the difference in times (assuming your time_c fields are DATETIME or something similar) SELECT HOUR (TIMEDIFF ( (SELECT max (u1. `e. 0 More Examples Example Return the number of days between two date values: SELECT DATEDIFF ("2017-06-25 09:34:21", "2017-06-15 15:25:35"); Try it Yourself » MySQL DateDiff Seconds. e. Commonly used datepart units include month or second. DATEDIFF() is a function found in SQL Server and MySQL that calculates and returns the difference between two date values. Syntax. id comparison is not actually needed, though still makes the intent of the query clearer. MySQL DATEDIFF () 函数返回两个日期值之间的天数。. SELECT TIMEDIFF ('2007-12-31 10:02:00','2007-12-30 12:01:01'); -- result: 22:00:59, the difference in HH:MM:SS format SELECT TIMESTAMPDIFF (SECOND,'2007-12-30 12:01:01','2007-12-31 10:02:00'); -- result: 79259 the difference in seconds. 1 Answer. expr1 and expr2 are date or date-and-time expressions. Note that the date format of 'birthday' here is date: YYYY-MM-DD. . Follow asked Dec 31, 2011 at 4:46. I also tried to use DATEDIFF function, but its implementation is different in all of these databases. For example, We want to get the difference between Jan 10th 2021 and Jan 25th 2021, then. Query #1 here should tell you which times are the beginnings of chains by finding which times do not have any times below them but within 3 seconds: SELECT DISTINCT Timestamp FROM Table a LEFT JOIN Table b ON (b. 000MySQL DateDiff Seconds. If you want to learn MySQL, just remember the following command. 1. SELECT TIMESTAMPDIFF (MONTH, '2012-05-05', '2012-06-04') -- Outputs. You can write the query in a SQL statement using the DATEADD and DATEDIFF() function. DATE_ADD(date, INTERVAL value addunit) Parameter: This function accepts two parameters which are illustrated below: date – Specified date to be modified. I'm working on mysql. MySQL :: MySQL 5. SQL 語法. The first date is adjusted by adding 1 year, and the second date is adjusted by adding 1 month. 1. 1) Simple DATEDIFF() function example. Share. MySQL timediff function does not give proper output. 5 Framework solution (it is in multiple projects) In. 2. To create an interval value, you use the following expression: Followed by the INTERVAL keyword is the expr that determines the interval value, and unit that specifies the interval unit. @Enrico - Not true. SQL 語法. Problem. You can use DATEDIFF(it is a built-in function) and % (for scale calculation) and CONCAT for make result to only one column. select id, CAST (datediff (curdate (),birth_date) / 365 as int) from student. Date difference in seconds: SELECT (strftime("%s", "now") - DateCreated) FROM Payment; -- Output: 956195. You can use this to get integer value. Here the date1 is less than date2, so the return value is negative. Mysql Timediff function is not working for me for long date. From second to datetime sql server. Datediff return an integer, not a float or numeric. Solution 1 (difference in days, hours, minutes, or seconds): The result is: Discussion: To calculate the difference between the timestamps in MySQL, use the TIMESTAMPDIFF. Is there a trivial way I can convert the time there to return an integer (seconds)? mysql; sql; Share. 如果 date1 的日期晚于 date2 的日期，它返回一个正数，否则返回一个负数或者 0。. expr1 and expr2 are date or date-and-time expressions. 0. This allows. SELECT TIMEDIFF (end_time,start_time) AS "total" FROM `metrics`; meaning 116 hours, 12 minutes and 10 seconds. g. SELECT FROM_UNIXTIME (date_in_milliseconds/1000) FROM. It is to be noted that two expressions must be the same type. Just convert the result in seconds to decimal and to milliseconds and nano sec. SELECT DATEDIFF (SECOND, CONVERT (DATE,GETDATE ()), GETDATE ()) While this code may answer the question, providing additional context regarding how and/or why it solves the problem would improve the answer's long-term value. Learn MySQL Tutorial Reference Learn PHP. DATEDIFF in TSQL expects 3 arguments, in MySQL only 2 arguments. adddate addtime curdate current_date current_time current_timestamp curtime date datediff date_add date_format date_sub day dayname dayofmonth dayofweek dayofyear extract from_days hour last_day localtime localtimestamp makedate maketime microsecond minute month monthname now period_add period_diff quarter second. i. Some days have an extra second or two seconds depending on the year. 7 Date and Time Functions. mysql> SELECT SECOND('10:05:03'); -> 3; SEC_TO_TIME(seconds) TIME 値として、時、分、秒に変換された seconds 引数を返します。 結果の範囲は、TIME データ型の範囲に制約されます。 引数がその範囲外の値に対応している場合は、警告が発行されます。 文章浏览阅读10w+次，点赞59次，收藏168次。mysql的时间差函数timestampdiff、datediff的用法时间差函数timestampdiff、datediff的用法我们在写sql语句，尤其是存储过程中，会频繁用到对于日期、时间的比较和判断，那么对于这两个时间差比较函数用法做一个举例介绍。 MySQL the TIMESTAMPDIFF () returns a value after subtracting a datetime expression from another. DateDiff to show Minutes and Seconds. To perform calculations between two dates or times in MySQL, you can use the DATEDIFF function or the TIMESTAMPDIFF function. And here the addunit is the type of interval to add such as. This will return result like: Mtime 8 2 10 20 15 7 6. I need to get the difference between a definite time everyday say 12. The MySQL TIMEDIFF() function returns the difference between two time or datetime values. I have SQL Table like Where DateDiff is in format (hh. DATEDIFF () 函数只比较 date1 和 date2 的日期部分。. 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. If I put the time earlier than this time, it adds an extra day. Since DATETIME is based on 1900-01-01 being the "base date" meaning assinging 0 to a DATETIME will result in the value 1900-01-01, you can add your date difference to that and get a value relative to that point in time (1900-01-01). Syntax. SELECT ROUND((TO_DAYS(date2) - TO_DAYS(date1)) / 365). DATEDIFF () returns expr1 – expr2 expressed as a value in days from one date to the other. Let us take a look at the syntax and examples of the MySQL. SELECT DATEDIFF ("2020-11-12", "2020-11-19");MySQL DATEDIFF() With Negative Days Difference. Subtract two SQL DATE types (represented by java. I'm trying to calculate the difference between two datetime values. 如果 date1 的日期晚于 date2 的日期，它返回一个正数，否则返回一个负数或者 0。. You could use the microsecond unit and divide by 1000 - MySQL doesn't appear to support milliseconds. Follow asked Apr 7, 2016 at 20:50. dll Version 6. to convert strings to date or datetime, you should use . DATEDIFF Function. 1. The next example will show the differences between two dates for each specific datapart and abbreviation. datediff() 関数は、2つの日付の差を求める関数です。 第1引数の日付の方が大きければ正の値が返ります。 datediff()を使うと、想定通りの結果が取得できました datediff()関数の実行結果の具体例. The following example illustrates how to use the. With the SQL Server time functions, it is possible to calculate the difference between two dates in hours, minutes, and seconds. Why does Art. This function can be used when the function results in a number larger than the maximum value that can be stored in an integer data type. 0. (note: 3 milliseconds is smallest granularity for time in SQL Server)I have two date columns say start and end i want to know the datediff from the 1st date of 2018. HTH. DATEDIFF doesn't look at any smaller units than the one specified in the first argument. SQL Server Syntax DATEDIFF(datePart, date1, date2) The DATEDIFF() function in SQL Server has three required parameters: datePart is the part of the date to return. Some days have an extra second or two seconds depending on the year. `e. It then subtracts the second date from the first. As documentation states: Only the date parts of the values are used in the calculation. If start is greater than end the result is negative. But this returns something like HH:ii:ss. If you want the "exact" (as far as floating point gets) average, use. AccountNumber AND T2. I set up my MySQL database with the field 'time' It is not HH:MM in the traditional sense, it is the time an event occurred, so an event with the value of 5:45 occurred with 5 minutes 45 seconds left in a game. 5,460 28 28 gold badges 98 98 silver badges 166 166 bronze badges. select datediff function() date1, interval date2; Explanation: In the above syntax, we use a select clause where the datediff Function means various date-related functions, where date1 is the first specified date, and date2 is the second specified date. From the msdn, it returns the count (signed integer) of the specified datepart boundaries crossed between the specified startdate and enddate. MySQL Datediff syntax. Most often, losing the date information and keeping only time information in a field is misguided. One month is considered elapsed when the calendar month has increased and the calendar day and time is equal or greater to the start. The syntax for DATEDIFF is pretty straightforward: DATEDIFF (datepart, startdate, enddate) Let’s explore the parameters used here: datepart: The unit of time you want to use for the calculation, like year, quarter, month, day, or even smaller units like hour, minute, or second. Use DATEADD and DATEDIFF() function together in SQL query. Learn MySQL Tutorial Reference Learn PHP. And maybe MySQL will complain for the first row since t2. SubmittedDate = 2012-02-29 07:02:55. Share. The MySQL DATEDIFF function returns the difference in days between two date values. I have one more table which is location. When I try to calculate the datediff in minutes or seconds, I receive the mesage 'Can't display the visual -> OLE DB or EDBC error: [Expression. Second date is the result of now(3) statement. The DATEDIFF function calculates only the date portion, ignoring the time portion in the column. Remove it, it retracts it again. As a result, As a result, “ datediff (year, date '1-Jan-2009', date '31-Dec-2009') ” returns 0, butLearn MySQL. Seems like a very common issue but i just can't get it to work. Aurora MySQL supports EXTRACT as a generic DATEPART. earthquakes; Extracting only time from date-time column in SQL | Image by Author. Use the UNIX_TIMESTAMP function. The SQL DATEDIFF () function is an in-built function in SQL that is used to return the difference (as a signed integer value) between two dates or times. YEAR: Stores the year information only, either in 2-digit or 4-digit format. Besides MySQL DATE, of the database management systems most useful commands is MySQL DATEDIFF. sql; sql-server; sql-server-2008; Share. Follow edited May 23, 2017 at. SELECT * FROM tableName WHERE now () - interval 10 minute < stored_timestamp. Definition and Usage. Take a look at the code below - notice the 1 millisecond difference in the two returned values. 較舊的日期減較新的日期會得到負數：. [date], getdate ()), isnull (sett. Example. The MYSQL DATEDIFF () function accepts two date or, date-time values as parameters, calculates the difference between them (argument1-argument2) and returns the result. The TIMESTAMPDIFF function returns the result of begin - end, where begin and end are DATE or DATETIME expressions. Subtracts the 2nd argument from the 3rd (date2 − date1). Description. This function returns difference between the given date values in the form of days. TSQL DateDiff to return number of days with 2 decimal places. Date > T1. This function is used to find the difference between two specified values of date. PostgreSQL - Date Difference in Months. expr1 and expr2 are date or date-and-time expressions. These functions assist in comparing, adding, subtracting, and getting the current date and time, respectively. sql. DATEDIFF function in MySQL. The problem with your approach here. I have a query in which I am pulling the runtime of an executable. début)/365) Here is my table and the result in the 'montant_annuel' column:This situation calls for the use of MySQL ADDTIME () function. Mysql TIMESTAMPDIFF for time datatype return negative value. Instead, use the dateAdd function on todays date, and compare the database table column to the result of that single calculation. This is alright as. or seconds. Some days have an extra second or two seconds depending on the year. Alternatively, for the difference between dates in minutes, hours, days, weeks, months, or years – SELECT TIMESTAMPDIFF (UNIT, `DATE-A`, `DATE-B`) FROM `TABLE`. second, ss, s = Second; millisecond, ms = Millisecond; date1, date2: Required. Arguments. DECLARE @NumberOfSeconds int SET @NumberOfSeconds = 3843 -- 1 hour, 4 minutes, 3 seconds SELECT @NumberOfSeconds AS 'seconds', CONVERT (varchar, DATEADD (second,. ), the start date or time that specifies the beginning of the period. Convert DateDiff into Hours, Minutes, Seconds, Milliseconds Forum – Learn more on SQLServerCentral7. ADDDATE () MySQL ADDDATE () adds a time value with a date. 8494441'. 更多 SQL Server 相關的日期時間函數在這邊. The above can still be subtly wrong if seconds are involved (it can slightly overcount because its counting minute transitions) so if you need second or millisecond accuracy you need to adjust the DATEDIFF to use those units and then apply suitable division constants (as per the hours one above) to just return hours and minutes. Example 4. UNIX_TIMESTAMP convert datetime to number of second from epoch. The date expressions can be of DATE, DATETIME, or TIMESTAMP type. It was introduced. You shouldn't be converting to time - it is meant to store a point in time on a single 24h clock, not a duration or interval (even one that is constrained on its own to < 24 hours, which clearly your data is not). Syntax DATEDIFF ( date1, date2) Parameter Values Technical Details Works in: From MySQL 4. Introduction to MySQL TIMEDIFF () function. But it is not transparent for my stakeholder. MySQL also supports DATEDIFF function, but it has a different meaning. From MySQL DATEDIFF docs: Only the date parts of the values are used in the calculation. SET @date1 = '2010-10-10 00:00:00', @date2 = '2010-10-11 00:00:00'; SELECT DATEDIFF(@date1, @date2) AS 'DATEDIFF', TIMESTAMPDIFF(day, @date1,. One date is stored, and is a date of a particular event. 1 Answer. adddate addtime curdate current_date current_time current_timestamp curtime date datediff date_add date_format date_sub day dayname dayofmonth dayofweek dayofyear extract from_days hour last_day localtime localtimestamp makedate maketime microsecond minute month monthname now period_add period_diff quarter second. I am using MYSQL version 5. Example: Datetime1 is 2015-12-16 08:00:00 and datetime2 is 2015-12-16 10:45:00. enddate: The ending datetime value. GETDATE and GETUTCDATE. second uses the hour, minute, and second, but not the fractional seconds. If TIMESTAMPDIFF () returns NULL, we can find rough age by subtracting the current year from the year of birth. MySQL UNIX_TIMESTAMP() returns a Unix timestamp in seconds since '1970-01-01 00:00:00' UTC as an unsigned integer if no arguments are passed with UNIX_TIMESTAMP(). SQL Query returns a negative number but does not interpret it as a negative number but a positive number. StartTime: 2022-27-27 14:00:00 EndTime:2022-12-12 19:30:00 Firstly, to find the time difference, we will use. First, create and populate sample table (Please save us this step in your future questions):CREATE TABLE face_login_logout (. "timestamp" is a column in MYSQL which I hold a timstamp as such "1365793346". It can be used to do date math as well. Flicker is observing that if you have only time information, you can't formally tell how many days are between the events, so your answer can be off by a multiple of 86,400 seconds (the number. Second option is wrong when start hours/minutes/seconds is less then end. This function includes only the date parts of the arguments while calculating the difference. Date DateAdd DateDiff DatePart DateSerial DateValue Day Format Hour Minute Month MonthName Now Second Time TimeSerial TimeValue Weekday WeekdayName Year Other Functions:. If NULL means "today", use. Functions. 0. These arguments represent the two dates you want to compare. TIMESTAMPDIFF() – Return the difference between two timestamp values. 0 Runtime Version v4. Grouping Results by Day. And after I apply my conditions with a WHERE statement.