But the output I get is 1 (day). If startdate and enddate are both assigned only a time value, and the datepart is not a time datepart, DATEDIFF returns 0. I am using below code for today and database date. – Tim Biegeleisen. Mysql Timediff function is not working for me for long date. TimeStamp2))<=4 WHERE. 4, the instances are limited in which a fractional seconds part is permitted in temporal values. The MySQL TIMESTAMPDIFF () function is used to find the difference between two date or DateTime expressions. My database is mysql. PHP MySQL TIMESTAMPDIFF with seconds not working. Set to 0 (zero) to have Dremio automatically decide. Default: 10; Maximum idle connections: The total number of connections allowed to be idle at a given time. SELECT TIMESTAMPDIFF (YEAR, YOUR_COLUMN, CURDATE()) FROM YOUR_TABLE AS AGE Check the demo image below. unit – Denota la unidad para el resultado. x -- here's an example : Erratic behaviour of TIMESTAMPDIFF() Note that MySQL 5. 045 enddate = 2010-02-23 03:45:39. Your query string would look like this:Your problem is that TIMESTAMPDIFF effectively first truncates the values to the indicated precision (e. end_date) which calculates the remaining seconds is straightforward and easy to understand. timestampdiff ()：根据指定单位返回两个时间相减的时间差。. MySQL中两个Timestamp之间的秒差 在MySQL中，可以使用TIMESTAMPDIFF函数来计算两个Timestamp之间相差的秒数。 SELECT TIMESTAMPDIFF(SECOND,'2021-09-01 10:00:00', '2021-09-01 10:01:30') as total_seconds; 上述语句的执行结果为90，即两个Timestamp相差90秒。1901 to 2155. answered Oct 2, 2017 at 13:25. Share. Often times, if these events occur at the same time, too many seconds get added on. user1864610. Take a look at the code below - notice the 1 millisecond difference in the two returned values. datetime_expr1. It effectively calculates the difference in seconds and divides (discarding the fractional part) by the number of seconds in the chosen unit. The function subtracts one datetime value from the other in the specified unit. 86 sec) Insert some records in the table using insert command −. On the other hand, DATEDIFF () doesn’t allow you to specify a unit. YYYY-MM-DD HH:MM:SS. when MySQL stores a value into a column of any temporal data type, it discards any fractional part and does not store it. – Ergest Basha. 3. 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。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. "timestamp" is a column in MYSQL which I hold a timstamp as such. 1. /format. MariaDB :addYears, addQuarters, addMonths, addWeeks, addDays, addHours, addMinutes, addSeconds, addMilliseconds, addMicroseconds, addNanoseconds. TIMESTAMPDIFF is from mysql db. Ask Question Asked 9 years ago. I want to make a function call that hase efect in SQLite like TIMEDIFF in MySQL. answered Aug 21, 2018 at 15:15. 6. SELECT * FROM tableName WHERE now () - interval 10 minute < stored_timestamp. I ran all three examples with BENCHMARK with valid and invalid dates. DATE () Extract the date part of a date or datetime expression. SELECT SUM(Seconds_In_State) From (SELECT Time_Stamp, MState, (-1 * TIMESTAMPDIFF(Minute, LEAD(Time_Stamp) OVER(ORDER BY Time_Stamp), Time_Stamp)) AS Seconds_In_State FROM Mstate WHERE. Requires 3 arguments. 返回值. I have this table but I am helpless how to calculate seconds for each separate day from this table: id from to ----- 1 2013-01-31 23:50:00 . ) operation (opens new. This function in MySQL is used to return a value after subtracting a DateTime expression from another. At least these are real and true seconds, unlike the MySQL DATEDIFF where they are. Example 1 : Getting the differences between two specified time values where the time is specified in the format of YYYY-MM-DD HH-MM-SS. types. The value returned is an INTEGER, the number of these intervals between the two timestamps. select TIMESTAMPDIFF (SECOND, '2018-09-05 09:26:38', NOW ()); TIMESTAMPDIFF () accepts three. MYSQL CREATE, ALTER, DROP, TRUNCATE, VIEW Tables. You can use it like you would any other value in e. それぞれのペットが何歳なのかを判別するには、 TIMESTAMPDIFF () 関数を使用します。. 097332 trigger_time = 2021-10-10 14:11:13. . *, timestampdiff (minute, start_time, end_time) as minutes from t;DATEDIFF() TIMESTAMPDIFF() 2つの引数を必要とする。 引数が3つ必要です。 第1引数から第2引数を引く（expr1 – expr2）。 第3引数から第2引数を引く（expr2 – expr1）。There are two columns ( t0 and t1) whose types are timestamp ( t0 = 2021-11-18 20:25:09 and t1 = 2021-11-18 20:36:41) I want to find t1 - t0 (expecting ~11 minutes or ~ 700seconds), but the result is 1132. date_or_time_part must be one of the values listed in Supported Date. DATEDIFF() seconds with millisecond to float or decimal. For SQLITE, the condition should be For SQLITE, the condition should be '(JulianDay(values. Param2 FROM Table1 t1 LEFT JOIN Table2 t2 ON ABS(TIMESTAMPDIFF(SECOND,t1. status_timestamp) as last_timestamp FROM t tmain. However, the search condition TIMESTAMPDIFF (SECOND, NOW (), (q. i. I have this working SQL code (MySql), that returns number of Seconds a MState value have been eg. 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. orders. By default, MySQL TIME fields allow a time range of '-838:59:59' to '838:59:59'. 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. To determine how many years old each of your pets is, use the TIMESTAMPDIFF () function. timestampDiff (timestamp1, timestamp2). 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. Below. Its arguments are the unit in which you want the result expressed, and the two dates for. objects. DATEADD. Updating could be done via ajax requests (probably bad idea when using multiple timestamps) or via manually incrementing the given time. 0. For example: Check in date is 12-04-2010 Check out date 15-04-2010 The day difference would be 3. MySQL Database: Restore Database. Result is expressed as a time value (and it has the limitations of the time data. Sorted by: 3. 7 Date and Time Functions. – Akina. Syntax. The syntax of sec_to_time() function is: SEC_TO_TIME(seconds); Hereseconds is the number of seconds you want to be. So we could modify the previous example so that TIMESTAMPDIFF. Syntax : TIMESTAMPDIFF (unit,expr1,expr2). speed as speed FROM stops f, stops f2 where f2. DATE_ADD () Add time values (intervals) to a date value. Learn more about TeamsMySQL TIMESTAMPDIFF() Function - The DATE, DATETIME and TIMESTAMP datatypes in MySQL are used to store the date, date and time, time stamp values respectively. . TIMESTAMPDIFF (unit,datetime_expr1,datetime_expr2); datetime_expr1. Net write timeout (in seconds): Seconds to wait for data from the server before aborting the connection. timestamp,f. Convert from epoch to date. g. The query to create a table is as follows: mysql> create table convertTimeDifferenceDemo -> ( -> Id int NOT NULL AUTO_INCREMENT, -> StartDate. now () - a. Calculating the number of weeks between two dates: SELECT CONCAT (first_name, ' ', last_name) AS full_name, employment_date, FLOOR (DATEDIFF (CURRENT_DATE, employment_date) / 7) AS weeks_difference FROM employees; In this example, the DATEDIFF () function calculates the number of days between today’s date. . @Enrico - Not true. Learn more about TeamsFor millisecond, the maximum difference between startdate and enddate is 24 days, 20 hours, 31 minutes and 23. UPDATE `table` SET end_dt = DATE_ADD(end_dt, INTERVAL (15 - TIMESTAMPDIFF(SECOND, NOW(), end_dt)) SECOND) WHERE DATE_SUB(end_dt, INTERVAL 15 second) <=. Add a comment. id-1 and f. Your first answer. If it returns 00:06:00 or 01:02:00, the corresponding record. Syntax : TIMESTAMPDIFF(unit,expr1,expr2). The value returned is an. Hot Network Questions Job offer doesn't smell quite right - is this a scam?. For Example: If the dateTime is 2013-10-08 10:36:00, I want to convert it into 2013-10-08 10:30:00 Similarly,2013-10-08 10:22:00 to 2013-10-08 10:15:00. About; Products For Teams; Stack Overflow. Of course, raw seconds makes it more difficult to compute days, weeks, or even years, but you will have a more. The following query selects all rows with a date_col value from within the last 30 days: . MySQL TIMESTAMPDIFF() Function - The DATE, DATETIME and TIMESTAMP datatypes in MySQL are used to store the date, date and time, time stamp values respectively. If you are looking for row less than 1 day old (meaning less than 24 hours old, or less than 86400 seconds old), with a resolution up to a second, you could use a predicate like one of these:. HTH. end) as elapse from c1) df MySQL. The MySQL TIMESTAMPDIFF () function is used to find the difference between two date or DateTime expressions. DATEDIFF in Aurora MySQL only calculates differences in days. The following table summarizes the difference between these two functions: TIMEDIFF () TIMESTAMPDIFF () Requires 2 arguments. Seconds (00. Follow. Description. The basic syntax: TIMESTAMPDIFF(unit,datetime1,datetime2); You can find a list with different types of units, check out the list in the section above. 引数は、結果を表す単位と、差異を取る 2. select timestamp ('2021-01-02 03:04:05')-0;. About;. 0 TIMESTAMPDIFF giving unexpected result. TIMESTAMPDIFF in a php foreach-loop. MySQL LAST_DAY Function Examples. ThanksBased on the format string ‘%d, %m, %Y’, the STR_TO_DATE() function scans the ‘21,5,2013’ input string. The unit for the result (an integer) is given by the unit argument. You can use TIMESTAMPDIFF function for getting Approximate difference between two timestamps. SELECT TIMESTAMPDIFF (SECOND, start_time, end_time). MySQL – TIMESTAMPDIFF() Function The DATE, DATETIME and TIMESTAMP datatypes in MySQL are used to store the date, date and time, time stamp values respectively. SELECT f. select a= TIMESTAMPDIFF(MINUTE,P_date1 ,P_date2) . This function only works correctly at the level of seconds for timestamps within a few days of each other; it overflows gracelessly (as I discovered with great pain). 1. I have query in Mysql which return minutes using TIMESTAMPDIFF in table. TIMESTAMPDIFF(MINUTE,T. . 21. The supported range is '1000-01-01 00:00:00' to '9999-12-31 23:59:59'. Syntax :. SELECT TIMESTAMPDIFF(HOUR, '2010-11-29 13:13:55', '2010-11-29 13:16:55') as newtable; | newtable | 7 1 row in set (0. calculate time diffrence in mysql by seconds. TimeStamp2, t2. TimeStamp1,t2. day) and then does the subtraction. Here, First, we are finding the. DATE_ADD, DATE_SUB, TIMESTAMPADD. But from what i can see in the logs its more like that Drill Hands over the Function Call "TIMESTAMPDIFF" to the Oracle database. SELECT * FROM schedule WHERE TIMESTAMPDIFF(SECOND,dateTime,TIMESTAMP('2015-01-31 10:00:00'))>0The UNIX_TIMESTAMP() function, an intrinsic feature of MySQL, offers an elegant solution for converting a TIMESTAMP column into seconds since the Unix epoch. 0] Information in this document applies to any platform. You don't need to perform annotate or aggregate if you need difference for all the records. A BIGINT. ), the start timestamp, and the end timestamp. numeric-expression. Mysql TIMESTAMPDIFF for time datatype return negative value. Share. You can just subtract datetimes and it will return the value: select (now () - interval 2 day) - (now () - interval 5 day); The result isn't a datetime (it's some decimal coded date -- 3000000 for three days in this case), but it isn't correct to say consider a datetime and an interval as the same datatype. The TIMESTAMPDIFF () function's 2nd and 3d arguments are datetime expressions and the 2nd is subtracted from the 3d. This implies that the difference between times should not be more then 30 seconds. 3. If you want to diff an earlier start time against a later end time, then the former should appear before the latter in the call to TIMESTAMPDIFF. All this data is stored in a single table. SELECT TIMESTAMPDIFF(SECOND, '2012-06-03 13:13:55', '2012-06-06 15:20:18') sec Now I need to convert this seconds in date time in SQL. The function supports units of years, quarters, months, weeks, days, hours, minutes, seconds, milliseconds, microseconds, and nanoseconds. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. The TIMESTAMP () function returns a datetime value based on a date or datetime value. ADDDATE ( date ,INTERVAL expr unit) , ADDDATE ( date, days) The TIMESTAMPDIFF function returns the result of begin - end, where begin and end are DATE or DATETIME expressions. B/c Time will extract only time from timestamp. 13. I tried this: SELECT DATE_SUB (NOW (), upload_date) FROM is_meeting_files. SET @date1 = '2010-10-11 00:00:00', @date2 =. But if I put DAY OR MONTH it works I really can’t figure out what might be the . Example 3 – A ‘datetime’ Example. Immutable if start and end dates are TIMESTAMP; Stable if start and end dates are TIMESTAMPTZ; SyntaxFor MySQL The TIMESTAMPDIFF is the native MySQL function which returns the difference between two given timestamps (one timestamp is subtracted from the other) for the specified date part interval (seconds, days, weeks, etc. So we could modify the previous example so that TIMESTAMPDIFF. They are: Unit type, datetime expressions, and datetime expression2. MySQL. +1 for to the point the stored timestamp is less than x minutes. As you see, it expects the parameters to be of type. As an entirely different approach, you could get the difference in seconds, and convert to TIME datatype. Stack Overflow. The following table, based on the MySQL manual, describes the format specifiers:. Instead, the result is 838:59:59, which makes sense because that is the limit. What this allows you to do is pass in two TIMESTAMP or DATETIME values (or even DATE as MySQL will auto-convert) as well as the unit of time you want to base your difference on. The query also selects rows with dates that lie in the future. MySQL Database: Restore Database. ; Full example. Unable to use 'where' when using 'timestampdiff' in mySQL. Here’s a quick rundown of the functions you can use in MySQL: ## #TIMESTAMPDIFF TIMESTAMPDIFF() returns the difference in the given unit. datediff() not ignoring time. One expression may be a date and the other a datetime. 6 Answers Sorted by: 11 You could use the native TIMESTAMPDIFF function : SELECT TIMESTAMPDIFF (<INTERVAL>,<timestampFrom>,<timestampTo>); If you want to find the difference between the first and the last timestamp of a given host ID, here you are: SELECT TIMESTAMPDIFF (MINUTE,MIN (pingtime),MAX (pingtime)) FROM yourTable WHERE host = 2; Share Fractional seconds for TIME , DATETIME, and TIMESTAMP values are supported, with up to microsecond precision. MySQL convert timediff output to day, hour, minute, second format. Follow answered. Let us walk through them quickly: To calculate the difference between dates in days – SELECT DATEDIFF (`DATE-A`, `DATE-B`) FROM `TABLE`. 1. On the other hand, if. The DATEDIFF() function returns the time between two dates. Below would correct the most popular answer to return hours as an integer and minutes as a decimal (ie 6. Modified 9 years ago. Stack Overflow. The Syntax. Note that unit values can be different in SQL Server DATEDIFF and MariaDB TIMESTAMPDIFF. Unix time, leap seconds, and converting Unix time to a dateMySQL interval is an operator, which is based on the binary search algorithm to search the items and returns the value from 0 to N. to minutes select a= TIMESTAMPDIFF(SECOND,P_date1 ,P_date2). The above works as expected. 引数は、結果を表す単位と、差異を取る 2. 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,. And when specifying second instead of microsecond it. When used as a number, a timestamp like '2021-01-02 03:04:05' will be treated as 20210102030405. If you want the difference between just two times like '11:10:00' minus '10:20:00' then use select. There are five data types in MySQL. One month is considered elapsed when the calendar month has increased and the calendar day and time is equal or greater to the start. Another approach to convert TIMESTAMP to UNIX time involves utilizing the TIMESTAMPDIFF() function in combination with UNIX_TIMESTAMP(). Sorted by: 2. Learn more about TeamsReturns. 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. 6 timestampdiff problem with return result. answered Oct 2, 2017 at. 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. Calculating the difference in seconds of DateTime values: To calculate the difference, just change the argument MINUTE to SECOND. 5 Date Calculations. should be. Stack Overflow. SELECT TIMESTAMPDIFF. TIMESTAMPDIFF(MINUTE,T. timestampdiff(unit,datetime_expr1,datetime_expr2)中unit选项 FRAC_SECOND。表示间隔是毫秒 SECOND。秒 MINUTE。分钟 HOUR。小时 DAY。天 WEEK。星期 MONTH。月 QUARTER。季度 YEAR。年. MySQL TIMESTAMPADD () adds time value with a date or datetime value. TIMESTAMPDIFF. If you want to diff an earlier start time against a later end time, then the former should appear before the latter in the call to TIMESTAMPDIFF. timestamp_start)) as total_time From timestamp. So i want to use the same query to get the TIMESTAMPDIFF in a table in Oracle. Use TIMESTAMPDIFF in MySQL: SELECT TIMESTAMPDIFF(SECOND,from,to); Example:If you average that directly, mysql will try to cast 04:01:56 to an int and end up with avg(04) instead. If start is greater than end the result is negative. Aurora MySQL also supports DATE_SUB for subtracting date parts from a date time expression. You want SECOND:. It will return the difference in terms of an INTERVAL DAY TO SECOND type: org. 5 hours). 이 외에도 차이를 연, 분기, 월, 주, 일, 시, 분, 초를 지정하여 가져올 때 사용하는 함수가 timestampdiff. elapse)/60 as diff from( SELECT c1. Month-difference between any given two dates: Have a look at the TIMESTAMPDIFF () function in MySQL. The unit for the result (an integer) is given by the unit argument. Select TIMESTAMPDIFF (SECOND, TIME (a. If you have a variable holding another UNIX_TIMESTAMP, you can get the difference and turn seconds to minutes (and round/truncate the result if needed): SELECT ROUND ( (UNIX_TIMESTAMP ()-1506947452) / 60, 0) Share. The two expressions don’t have to be of the same type. If the second date or time is earlier than the first date or time, the result is negative. You can use the MySQL HOUR(), MINUTE() and SECOND() functions to break the time returned from SEC_TO_TIME into its components. A date or date with time is returned. MySQL :: MySQL 5. Some days have an extra second or two seconds depending on the year. This will provide you a whole number: SELECT TIMESTAMPDIFF (WEEK, date1, date2) AS weeks; To include a fraction for days, use: SELECT TIMESTAMPDIFF (DAY, date1, date2) / 7 AS weeks_days; or a fraction for seconds, use: SELECT TIMESTAMPDIFF (SECOND, date1, date2) / 604800 AS weeks_secs; as 604800 is 7 *. 0 datediff() not ignoring time. 1. 0 [Release 1. 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. From the msdn, it returns the count (signed integer) of the specified datepart boundaries crossed between the specified startdate and enddate. Even if there where, seem like nice trade off an extra column for not having to calculate the diff for each row on each query! Oh, and you can just retrieve what you want like this: Timer. For EST using FROM_UNIXTIME will result. Follow. MySQL MySQLi Database. 1. TIMESTAMPDIFF() : This function in MySQL is used to return a value after subtracting a DateTime expression from another. You need to use the function available in your db in the below queryset. MySQL is quite different from SQLite. select(sum(df. Calculates the difference between two date, time, or timestamp expressions based on the specified date or time part. Below is a practical illustration of this method:In this method, we create a custom function ConvertSecondsToUnits that takes the number of seconds and the desired unit ('days', 'weeks', or 'months') as parameters. I have a column where I log all time entries of any event. If you wanted to avoid SEC_TO_TIME (seconds), you can build up the string yourself. This function takes the difference between two dates and shows it in a date format yyyy-mm-dd. Method . 1 Answer. select SEC_TO_TIME (sum (diff)) as result from ( select timestampdiff (second,min (case when log_tpe='start_break' then timestamps end) , min (case when log_tpe='end_break' then timestamps end)) as diff from t group by date (timestamps),hour (timestamps) )A. The timestamp difference returns the difference between two dates in seconds. TIMEDIFF('00:04:50','23:59:59');. 58 and found no overflow with timestamps differing by up to at least 10000 years. 6 Fractional Seconds in Time Values - MySQL 5. If you divide until day, you are fine (every single day every year has the same amount of seconds). One year has 365 days. a call to timestampdiff:日付関数 (比較, 加算, 差分, 抽出)の使い方. You probably want to use timestampdiff () select DriverName, CarType, min (timestampdiff (second, StartTime, EndTime)) as Best, max (timestampdiff (second, StartTime, EndTime)) as Worst from followingtable ft group by DriverName, CarType; If you want to show the value as a time format: select DriverName, CarType, date_format (cast. Alternatively, you can use either of the functions TIMESTAMPDIFF() and UNIX_TIMESTAMP(), both of which return integers. In MySQL, the TIMESTAMPADD () function allows you to add a specified amount of time to a date or datetime value. I would recommend to choose that unit. YEAR ('2015-01-01') returns 2015, which is not a valid date, which breaks timestampdiff () causing it to return NULL. In applications that involve event scheduling, DATE_ADD () helps determine future event dates based on specified intervals. Weeks, quarters, and years follow from that. . n+MySQL8. In MySQL, you would do something like this to get the time interval:. 1. You should use TIMESTAMPDIFF () to achieve that. Elasticsearch SQL accepts also the plural for each time unit (e. is_deleted IS NULL AND r. Use this link to know how to get accurate result using EXTRACT () and JULIAN_DAY () function. 1. MySQL provides a set of functioMySql version >=5. Note that TIMESTAMPDIFF. Date or DateTime could be one of them. In MySQL, how would I get a timestamp from, say 30 days ago? Something like: select now() - 30 The result should return a timestamp. You can use TIMESTAMPDIFF function for getting Approximate difference between two timestamps. début)/365) Here is my table and the result in the 'montant_annuel' column:MySQL Examples MySQL Examples MySQL Editor MySQL Quiz MySQL Exercises MySQL Certificate. values('id', 'diff_time')MySQL TIMESTAMPDIFF() function explained. DayToSecond. Like for example the conversion value to Hours and Minutes is 4 Hours and 30 Minutes. 3. To calculate the difference between two date/datetime expressions, use TIMESTAMPDIFF. . Im not sure if using "AS thisisit" is a current function of TIMESTAMPDIFF but I. You may have to swap the datetime values to get the right sign (positive/negative) on the result if the column is before/after "now". username, cb_users. 3. It returns an integer as a result. In order to convert days to a date, so you can get the number of years etc you need to use from_days(); from_days() doesn't really work before 1582, to quote from the documentation: "Use FROM_DAYS(). However, two of them only store part of a date: TIME stores the time, and YEAR stores the year. DATE_FORMAT () Format date as specified. Syntax. So, I would like to group them by gateway ID and have the value in hours, minutes and seconds. Hisham. thanks for your input. To calculate the difference between the timestamps in MySQL, use the TIMESTAMPDIFF (unit, start, end) function. Teams. It only returns the result in days. I need to produce a recordset that gives me the time between prints in seconds. As an example, if we entirely ignore any "seconds" portion of the datetime/timestamps, and work with whole minutes, something like this: NOTE: this is not fully tested. MySQL's TIMESTAMPDIFF () method is defined with the following syntax, accepting three required parameters: SELECT TIMESTAMPDIFF (unit, date_time_1, date_time_2); The parameters are: unit - The unit of the date and time measurement in seconds, minutes, hours, days, months, years, etc. This method returns the difference between two dates in the units supplied as the first parameter. Return the difference between two time expressions: SELECT TIMEDIFF("13:10:11", "13:10:10");The main misunderstanding in MySQL with timestamps is that MySQL by default both returns and stores timestamps without a fractional part. The default timezone used by MySQL is the SYSTEM timezone. After executing you can use it like this. imei as imei, f. The functions in this section use a format string that is compatible with the MySQL date_parse and str_to_date functions. By default, this is set to 8. Then it adds the number of the full days to the starting time and reduces the closing time my the sum, so what remains is the time in the current day. These functions add units of the interval specified by the function name to a date, a date with time or a string-encoded date / date with time. I use the same date in both date parameters. +1 For keeping the query sargable and not wrapping the timestamp. Try looking into UNIX_TIMESTAMP and SEC_TO_TIME.