The TIMEDIFF () function returns the difference between two time/datetime expressions. I don't think this is really important to your question. Use DATEDIFF () to calculate the difference between two dates. SELECT * FROM tableName WHERE now () - interval 10 minute < stored_timestamp. These arguments represent the two dates you want to compare. Here the date1 is less than date2, so the return value is negative. 3k 53 53. datediff (timestamp) function. Note: time1 and time2 should be in the same format, and the. This method returns the difference between two dates in the units supplied as the first parameter. Syntax. SQL Server: Round Date Up. Hot Network QuestionsDATEDIFF(hour, start_date, end_date) will give you the number of hour boundaries crossed between start_date and end_date. The age in days between the two dates is either 2 or 3 days, but in one case the DATEDIFF function returns an Int data type. SQL Server DATEDIFF function returns the difference in seconds, minutes, hours, days, weeks, months, quarters and years between 2 datetime values. 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 ). You need to pass the date expressions as arguments to the DATEDIFF () function: The. Viewed 18k times. 3; Jun 2009). And maybe MySQL will complain for the first row since t2. 4 and above. This is alright as DATEDIFF() supports a negative date difference. minutes = total_seconds DIV 60. It can be one of the following formats: Year: year, yyyy, yy As shown by other posters. I'm currently looking for a way to make it ignore the time part. In most cases, though, what you really want is the number of days from the first date to the second date. Return the current time. We can find the difference between the two dates using the following dateparts with the DATEDIFF function. Some time you expect the diff in "days" between 1. Mysql Timediff function is not working for me for long date. Some days have an extra second or two seconds depending on the year. You can write the query in a SQL statement using the DATEADD and DATEDIFF() function. 03 sec) You may. ADDTIME () In MySQL the ADDTIME () returns a time or datetime after adding a time value with a time or datetime. This function adds a number (a signed integer) to a datepart of an input date, and returns a modified date/time value. This prevents the crossing midnight issue. How to compare two dates ignoring seconds in sql server. 39 SELECT CONCAT ( FLOOR (HOUR (TIMEDIFF ('2010-01-06 08:46', '2010-01-01 12:30')) / 24), ' days ', MOD (HOUR (TIMEDIFF ('2010-01-06 08:46', '2010-01. SQL Server DATEDIFF function returns the difference in seconds, minutes, hours, days, weeks, months, quarters and years between 2 datetime values. 이 외에도 차이를 연, 분기, 월, 주, 일, 시, 분, 초를 지정하여 가져올 때 사용하는 함수가 timestampdiff. microsoft. T-SQL - Seconds per hour between two datetimes across 2 dates. Use the UNIX_TIMESTAMP function. I need to get the difference between a definite time everyday say 12. First, how do you get the difference between two times in seconds? The datediff() function is probably not the best function to use in such a situation. 11. Create a new column (ALTER TABLE) then run an UPDATE on it. 45 121 1. The SQL DATEDIFF () is a function, and use to find the difference between two dates. Return the seconds part of a datetime value: SELECT SECOND ("2017-06-20 09:34:00. I need to calculate the diff and have my answer show minutes and seconds. Until now, I've discovered timediff function. PostgreSQL - Date Difference in Months. get datediff hours in decimal sql server. We can get the difference in any type of datepart format like difference in days, month, year and etc. One month is considered elapsed when the calendar month has increased and the calendar day and time is equal or greater to the start. Discussion: Use the DATEDIFF() function to retrieve the number of days between two dates in a MySQL database. SET @date1 = '2010-10-10 00:00:00', @date2 = '2010-10-11 00:00:00'; SELECT DATEDIFF(@date1, @date2) AS 'DATEDIFF', TIMESTAMPDIFF(day, @date1,. SELECT DATEADD (month, 1, '20220730'); The below DATEADD will add 1 year to the provided date value, the year changed from 2022 to 2023. Timestamp) WHERE b. 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. To track the shipping turnaround time, we can use the DATEDIFF () function. DATEDIFF accepts either. idnum = btable. 1. So for the first argument I select all the dates of the 'idTime_stockout' column and for the second argument all the dates of the 'idTime_resupply' column. Functions. Same for SQL Server 2005-2012: SELECT DATEDIFF(day,valid_from,last_modified_date ) AS 'days' FROM table This will. g. Note: time1 and time2 should be in the same format, and the calculation is time1 - time2. 4 Answers. Improve this question. 更多 MySQL 相關的日期時間函數在這邊. For example, suppose you have values below the start and end times. SELECT TIMESTAMPDIFF (SECOND, '2010-01-01 10:10:20', '2010-01-01 10:45:59') AS SECONDDIFFERENCE;mysql: convert timediff() to seconds. DATE is used to store the value of the date. MYSQL Date diff between multiply dates in the same rows. 0. The TIMESTAMPDIFF function returns the result of begin - end, where begin and end are DATE or DATETIME expressions. 1. To get the number of seconds between two dates, the TO_SECONDS() function can come in handy, for. 0. From the inputs you got there are 123 months between the date of 07/03/2011 to 24/3/2021. 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. learn mysql. Getting the number of days between two specified date values where the date is specified in the format of YYYY-MM-DD. 0. 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. UNIX_TIMESTAMP will get you seconds and you need to multiply by 1000 to get milliseconds. Aurora MySQL supports EXTRACT as a generic DATEPART. MySQL TIMEDIFF () function. If, by mistake, you pass the second date value as a value larger than the first, you’ll get a negative value for the. NOW (3) will give you the present time from your MySQL server's operating system with millisecond precision. Works. ), the start date or time that specifies the beginning of the period. dll Version 6. Definition and Usage. 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. I am trying to use Datediff to find out the duration between columnA and columnB. 단순히 일 차이를 가져올 때 사용하는 것이 datediff 함수입니다. DAY_SECOND; DAY_MINUTE; DAY_HOUR; YEAR_MONTH; Technical Details. Commonly used datepart units include month or second. For example, We want to get the difference between Jan 10th 2021 and Jan 25th 2021, then. SQL Server Syntax DATEDIFF(datePart, date1, date2) The DATEDIFF() function in SQL Server has three required parameters:. SELECT id, job, TIMEDIFF(end_date,. 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. If you divide until day, you are fine (every single day every year has the same amount of seconds). DateDiff to show Minutes and Seconds. DATEDIFF doesn't look at any smaller units than the one specified in the first argument. This function includes only the date parts of the arguments while calculating the difference. It works if my beginning date is the first of january and the end date the 31st of December, but does not if it stars somewhere else during the year. The MySQL DATEDIFF () function allows you to count the number of days between two different date expressions. We can get current time by millisecond with h2 DATEDIFF () function. 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 timestamp difference returns the difference between two dates in seconds. startdate: The first date or datetime value. How to compare two dates ignoring seconds in sql server. mysql> SELECT. SQL Query returns a negative number but does not interpret it as a negative number but a positive number. Technically I know how to take the time from a tsql datetime. adate, INTERVAL 10 DAY), btable. You have the same problem when you try to calculate ages: select datediff (y, '2010-12-31', '2011-01-01') does't mean that the rounded difference is about 1 year, it only says that 1 new year happend. date, t2. Remove it, it retracts it again. (TO_CHAR(COLUMN_NAME_2, 'YYYY-MM-DD') , 'YYYY-MM-DD') AS DATEDIFF FROM TABLE_NAME; Share. 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. SQL DATEDIFF — Now & Then. DATEDIFF function. Below is an example with 2 queries with the same results. DateValue > DateAdd (day,-3,getdate ()) doing this in this way makes your. I want the difference to be returned as: 02:45:00 and not only 02:00:00. value addunit – Here the value is the date or time interval to add. Definition and Usage The DATEDIFF () function returns the number of days between two date values. When analyzing historical data, DATEDIFF () helps quantify the time. Approach to handle this issue: caliculate the number of seconds difference between the two dates ; convert the seconds to the milliseconds (multiply by 1000) add the milliseconds of your date to the result in the step 2. microseconds. earthquakes; Extracting only time from date-time column in SQL | Image by Author. In MySQL, DATEDIFF function, takes only two arguments: end date and start date: DATEDIFF(NOW(), P. DECLARE @NumberOfSeconds int SET @NumberOfSeconds = 3843 -- 1 hour, 4 minutes, 3 seconds SELECT @NumberOfSeconds AS 'seconds', CONVERT (varchar, DATEADD (second,. DATEDIFF. 00 pm and the value of that column. `s. 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. 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. Learn MySQL. Weeks, quarters, and years follow from that. Example 2 – Changing the Unit 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). I am looking for a way to extract difference in milliseconds between two date. DECLARE @date datetime SELECT @date = '2/11/1990 12:03:25. date) FROM mytable LEFT JOIN mytable AS t2 ON t2. TIMESTAMPDIFF() – Return the difference between two timestamp values. ); The start date. This introduces complexity in the calculation since in each date part, the previous date part value needs to be taken into account. Only the date parts of the values are used in the calculation. To do datediff, you have to have 2 date or datetime-values. MySQL - SUM of a group of time differences. Follow answered Dec 12, 2018 at 1:43. 1 Answer. 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') AS 8. The way it works is, you provide two arguments (one for each date), and DATEDIFF() will return the number of days between the two dates. It can be one of the following formats: Year:. g. One way around this is to use the builtin dummy table, dual: SELECT TO_DATE('2000-01-02', 'YYYY-MM-DD') - TO_DATE('2000-01-01', 'YYYY. Nilai datepart tidak dapat ditentukan dalam variabel, atau sebagai string yang dikutip seperti 'month'. id comparison is not actually needed, though still makes the intent of the query clearer. This function accepts three parameters − the type of interval to measure (such as year, quarter, month, hour, minute, etc. 1901 to 2155. This function includes only the date parts of the arguments while calculating the difference. Find the interval between today's date and a column. To correctly calculate elapsed time I use seconds divided by 60 for minutes and milliseconds divided by 1000 for seconds. 3. The following example uses the DATEDIFF() function to calculate the difference between two DATE. The syntax for the DATEDIFF function in MariaDB is: DATEDIFF( date1, date2 ) Note. AccountNumber AND T2. The following table lists all the valid datepart values. It wraps from 59 to 00 so the function correctly returns 1. MySQL datediff in a. 0 Runtime Version v4. (In our example, it’s the purchase_date column. for more on date functions MySQL documentation. I need to store also milliseconds. second, ss, s = Second; millisecond, ms = Millisecond; date1, date2: Required. 0. DATEDIFF_BIG () is a SQL function that was introduced in SQL Server 2016. DatePart. Follow asked Dec 31, 2011 at 4:46. randombits randombits. Let us take a look at the syntax and examples of the MySQL. Here is. This is done via. This will return difference in days. Sum datediff in minutes with MySQL. The current max precision of datetime2 (p) is (7) (from learn. Share. So I would return 0. MySQL DATEDIFF() With Negative Days Difference. It returns the number of days between two dates or datetimes. But I don't understand how to use it to collect differences within the table field. For example, DATEDIFF(milliseconds, '00:00:00',. Let us see an example of this. 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. Besides MySQL DATE, of the database management systems most useful commands is MySQL DATEDIFF. If data is stored as a DATE or DATETIME data type, it is stored as a binary value, NOT in any particular human-readable format. Stephen Quan Stephen Quan. startdate: The starting datetime value. The MySQL DATEDIFF () function takes two dates and returns the number of days between them. Do you guys know how to remove the minutes and seconds from a datetime? Instead of 2012-03-27 12:57:21. DATE_FORMAT () Format date as specified. The. Alternatively, for the difference between dates in minutes, hours, days, weeks, months, or years – SELECT TIMESTAMPDIFF (UNIT, `DATE-A`, `DATE-B`) FROM `TABLE`. MySQL DATEDIFF is used to find the difference between the specified dates. Basically the MySQL DATEDIFF function gives the difference between days between two date values. Figure 4. ); These arguments can be date/datetime values, expressions. DATEDIFF () 函数只比较 date1 和 date2 的日期部分。. If Value is in negative then DateDiff should give output as 0 instead of -value. This function only calculates the date portion from each expression. So, you want to search for rows in your HBData table where HBDateTime is earlier than that. For example, only seconds, or only minutes or only hours. startdate: The first date or datetime value. If you divide until day, you are fine (every single day every year has the same amount of seconds). DATEDIFF (DD, isnull (odd. TIME) AS `Secs` FROM theTable AS s LEFT JOIN theTable AS b ON a. UNIX_TIMESTAMP convert datetime to number of second from epoch. How to convert Seconds to HH:MM:SS using T-SQL (15 answers) Closed 3 years ago . Add a comment. What MySQL function can I use to get the difference in hours of the two date time strings? I tried DATEDIFF( SELECT TIMESTAMPDIFF (SECOND, '2012-06-06 13:13:55', '2012-06-06 15:20:18') In your case, the third parameter of TIMSTAMPDIFF function would be the. So if you’re trying to do MySQL datediff seconds, you’ll come to realize that the datediff() function only returns day values. So just put: WHERE DATEDIFF(second,'00:00:00',your_column) blablabla the comparisson you want for MySQL there is a function: TIME_TO_SEC(time) Converts the time '01:14:12' to seconds. g. Returns the time argument, converted to seconds. The unit for the result is given by another argument. op_name = 'Assembly'. Example: Datetime1 is 2015-12-16 08:00:00 and datetime2 is 2015-12-16 10:45:00. learn mysql. 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. Yes, because the timestamp handles the leap years. 0. There are five data types in MySQL. SELECT DATEADD(SECOND, -2147483647, GETDATE()) When I run this, I get: 1950-09-17 07:36:00. You can use this to get integer value. A note on waiting for TIME vs DELAY:. Some days have an extra second or two seconds depending on the year. 03 sec) You may. I have a simple query which calculates time difference between two datetime as below: SELECT TIMEDIFF ( '2012-08-19 08:25:13', '2012-07-19 18:05:52' ); Output: 734:19:21. Functions that return the current date or time each are evaluated only once per query at the start of query execution. Instead you can take the datediff in the smallest interval required (in your case, seconds), and then perform some math and string manipulation to present. my result is. 000 and the function returns the number of minutes since the beginning of the previous century. I have a requirement to get time difference between two DateTime's in HH:MM format not decimal. In most cases, though, what you really want is the number of days from the first date to the second date. Date DateAdd DateDiff DatePart DateSerial DateValue Day Format Hour Minute Month MonthName Now Second. To accomplish this, we will utilize the rental table, which contains essential information about customer rentals, including the dates they rented and. Use TIMESTAMPDIFF instead. But, we have a way to get the answer. Entity Framework 6 SqlFunctions DateDiff not implemented in nuget package. SELECT DATEDIFF(second, startdate, enddate) as seconds_diff; SELECT DATEDIFF(minute, startdate,. Apr 4, 2018 at 6:36. The MySQL DATEDIFF () function takes two dates and returns the number of days between them. It was introduced. It outputs the number of days between two dates. 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. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. 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. Definition and Usage The DATEDIFF () function returns the number of days between two date values. From the msdn, it returns the count (signed integer) of the specified datepart boundaries crossed between the specified startdate and enddate. Share. , year, quarter, month, day, hour, minute, second), startdate is the starting date or time, and enddate is the ending date or time. . 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. Temperature; What this query does is join every row of the table with every other row of the same table which has as recordDate the previous day and less. Stack Overflow MySQL DATEDIFF () returns the number of days between two dates or datetimes. For this, these must only be stored as permitted data values. As we know that DATEDIFF() function is used to get the difference in a number of days between two dates. One date is stored, and is a date of a particular event. Using DATEDIFF() in MySQL. Return Value of MySQL DATEDIFF() Function To convert a date/datetime expression into seconds, use the function TO_SECONDS. The latter is longer, but in terms of cpu time should be faster. TIMEDIFF () is essential for time-based analysis by enabling you to measure the duration of events or actions. 000. 25. MySQL interval values are used mainly for date and time calculations. oracle; date-arithmetic. 0. 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 ). If you want the result in hours you should use Timestampdiff. Syntax. You can use 19700101 for Unix epoch for example. First, how do you get the difference between two times in seconds? The datediff() function is probably not the best. To check the time difference using bigger units you can use TIMEDIFF with TIME_TO_SEC. 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. This DATE () is used to handle Date efficiently. It can be used to do date math as well. The TIMEDIFF () function returns the difference between two time/datetime expressions. Here the date1 is less than date2, so the return value is negative. DATEDIFF() is a function found in SQL Server and MySQL that calculates and returns the difference between two date values. The goal here is basically too add 15 seconds or reset the date to where only 15 seconds are left. I just downloaded the nuget packages for entity framework 6 (EntityFramework. I have to show the difference, currently I used a datediff in the stored proc which just shows the difference of the days :( but i need to show the difference in days:hours:minutes:seconds if possible. date will be null but I don't have the time to check now. 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. SQL Server: -- Get difference in days SELECT DATEDIFF(dd, '2022-09-01', '2022-09-05'); # 41. In other table I have information about creation and closed date for tickets and for now I just make a datediff between those 2 dates. 6 years will be considered 1 year, if instead you want to count only the full years, you can use FLOOR(). As a result, As a result, “ datediff (year, date '1-Jan-2009', date '31-Dec-2009') ” returns 0, butLearn MySQL. Let’s focus on the data types that can store a date: DATE: used for values that contain a date but no time. It shows us that there are 36 hours, 15 minutes, and 35 seconds between the two. About; Products For Teams;. In PostgreSQL, you can take the difference in years, multiply by 12 and add. If values of seconds are greater than zero, a decimal number may be produced. 実際にdatediff()を実行してみると以下のようになります 月をまたいでいても、正しく計算されている. The most straightforward way to calculate the difference between two dates in mysql is by using the DATEDIFF() function. Assign sql query result to compare using datediff function in mysql. 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. 1 Answer. Timestamp < a. Date). bash. DATEDIFF () 函数只比较 date1 和 date2 的日期部分。. 6 Fractional Seconds in Time Values. I have SQL Table like Where DateDiff is in format (hh. The problem is that I have a datetime field and I need to essentially grab the time portion convert that to an integer specifically seconds. Problem. 8. 097, I should get 2012-03-27 12:00:00. 1 Answer Sorted by: 78 Use TIMESTAMPDIFF in MySQL: SELECT TIMESTAMPDIFF (SECOND,from,to);This method returns the difference between two dates formatted as hours:minutes:seconds. the datediff function returns the value in a INT datatype and in this case the value is too large to hold in INT. 0 as decimal (10,10)) from TRACKED_OBJECT_HISTORY TOH1 where TOH1. MySQL DATEDIFF() With Negative Days Difference. Applies To. E. TIMESTAMPADD() – Add or subtract an interval from a timestamp or date. I only put RETURN DECIMAL. SELECT USER_ID, DATEDIFF (MAX (CASE WHEN ACTION="CLOSE_APP" THEN timestamp END), MIN (CASE WHEN ACTION="START_APP" THEN timestamp END) ) AS Duration FROM. Therefore, if you supply the seconds. aggregate function SUM for time values in MySQL. First, a quick example of turning a "number of seconds" into the "hh:mm:ss" format. In other words, if you choose the interval to be minutes a difference is expressed in minutes even if the difference is greater than a single hour. MariaDB: DATEDIFF Function. Only the date parts of the values are used in the calculation. EXTRACT, or one of: MICROSECOND, SECOND, MINUTE, HOUR, DAY, DAYNAME, DAYOFWEEK, DAYOFYEAR, WEEK, MONTH, MONTHNAME, QUARTER, YEAR. The MySQL Minute () Function is used to return the minute part from the given DateTime value. or seconds. you could just use . 53. Below query is my sql server query and I want it to convert it into hive query: select DATEDIFF([minute], '19000101', '2013-01-01 10:10:10') Stack Overflow About1. Some functions of the Date Functions are CURDATE, DATEDIFF, NOW, and DAYTIME. MySql DateDiff does not return negative. mysql> SELECT TIME_TO_SEC('22:23:00'); -> 80580 mysql> SELECT TIME_TO_SEC('00:39:38'); ->. The SQL DATEDIFF () function returns a long value specifying the number of time intervals between two specified dates . This allows. SQL 語法. Sorted by: 13. The timestamp difference returns the difference between two dates in seconds. I tried datediff (s, begin,end) and datediff. That is a 5 hour difference. startdate: The first date or datetime value. Like the. And here the addunit is the type of interval to add such as. If the int data type is insufficient for the difference between two dates, you should use the DATEDIFF_BIG function. To calculate an interval between TIME values as another TIME value, use the. Sorted by: 2. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. So, for example, DATEDIFF (last_order_date, first_order_date. 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. 5 Framework solution (it is in multiple projects) In. The first date is adjusted by adding 1 year, and the second date is adjusted by adding 1 month. The return data type is int. MySQL DATE_ADD function examples. 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. Shortest solution by @TomFp above, for converting a TIME column into seconds. The basic syntax: TO_SECONDS(datetime); For example, if you run the command: SELECT TO_SECONDS('2021-01-21 08:10:17'); The result is: 63778435817 UTC_TIME We can get current time by millisecond with h2 DATEDIFF () function. First we calculate the absolute difference in seconds and put that in a variable; then we check if we get one or more of each (day hour minute), and if so we calculate how any we get and put that in a variable; for units after the largest, we do the same, but first we subtract the seconds allotted to the previous unit from our overall difference If you want to check that the difference is less than 1 second, that means that the two dates must be the same, in which case you can simply use the equivalency operator. 3. 6 year will be considered. Convert DateDiff into Hours, Minutes, Seconds, Milliseconds Forum – Learn more on SQLServerCentral7. For up to date solution see jurkas' answer above. CONVERT(decimal(9,2),(DATEDIFF(MINUTE, StartDateTime, EndDateTime) / 60)); Is. MySQL DATEDIFF: Calculating the number of business days between two dates The next topic on our today’s agenda is to calculate the business days between two events (excluding weekends).