Get Value for Last Month. We need to pad a zero for single-digit months. Kindly tell me how to calculate age as in years month days. In case the full DDL for the database is requested, I can provide it (although it will probably exceed the character limit of Stackexchange). g. The name of the order date month is printed, followed by the day of the month, a comma, and four-digit year. DiffMonths ("7/15/95") 0. The function will always return the difference between two dates in days. For both DATEDIFF and minus sign: Output values can be negative, for example, -12 days. Just divide the total by 7 to get the weeks and then calculate the remaining days. If the dates are really timestamps, then this is easy - subtract them and the result is a day to second interval. Author. I m used to sql server. Modified 2 years, 6 months ago. Improve this question. The data type both are Date, one sample data . 0 and later: Fusion OTBI Analysis - How to Convert Date of Birth to Age. Hi, Everyone, I am trying to find out the difference in days between two dates and the query i am passing is SELECT TO_char(sysdate, 'dd/mm/yyyy')-TO_char('15/11/2011', 'dd/mm/yyyy') DAYS FROM DUAL. If you enter a negative parameter, the system subtracts the specified days, months, or years. PostgreSQL - Date Difference in Months. Step 5: Change Sort column. For many values of the local settings, this would simply fail. , year, quarter, month, day, hour, minute, second), startdate is the starting date or time, and enddate is the ending date or time. Asked 8 years, 2 months ago. SELECT AVG (DATEDIFF (d, DateUsed, DateExpires)) FROM tbl. In SQL Server, the DATEDIFF function. How to unite two columns of date + time for datediff - Oracle sql. DateDiff is use d to calculate the length of time between two dates. TASKID, PROJECT. About; Products. Syntax. This example returns the date of the next Sunday after January 1, 2000: SELECT NEXT_DAY ( DATE '2000-01-01', 'SUNDAY' ) FROM dual; Code language: SQL (Structured Query Language) (sql) It returns the following output: 02-JAN-00 Code language: SQL (Structured Query Language) (sql) Oracle doesn't have a DATEDIFF() function. Also to note that: DATEDIFF. from a date time value. It means that the DATEPART function returns the number of times the boundary between two units is crossed. So I am porting many SQL Procedures to Oracle. Each Standard calendar week is defined to start on Sunday and it spans 7 days. Here is a PostgreSQL function with the exact same behavior as the Oracle MONTHS_BETWEEN function. ) The dates and their formats are separated by a comma (,) and are defined in the Data field of the. Try SELECT SYSTIMESTAMP + INTERVAL '5' MINUTE, SYSTIMESTAMP + 5 / 24 / 60 to convince yourself. Comparison with Excel DATEDIFF function. If this format has been used to. 2 Answers. sample: SELECT months_between(column1,column2) FROM Table Share. Here’s the syntax for the DATEADD function: DATEADD (interval, number, date); The interval. For example, suppose you have values below the start and end times. If either expression is a character or graphic string, it must not be a CLOB. Label the column Years worked. 6. This field level rule lets you display the difference between two dates. USE MASTER GO -. date_to) * 2) - CASE WHEN DATEPART(DW, evnt. 2258064516. --Changing current database to the Master database allows function to be shared by everyone. - Find the “date_diff” in minutes and add it with the “date_diff” in hours and the “date_ diff” in days. The DATEPART () function returns an integer value that represents a specified part of the date of a given date. Syntax. SELECT DATEADD (month, 1, '20220730'); The below DATEADD will add 1 year to the provided date value, the year changed from 2022 to 2023. 33 shows the available functions for date/time value processing, with details appearing in the following subsections. Exhibit A: John Doe has served since Feb 10, 2016. getMonth (); int m2 = date2. So, it starts with RIGHT(“00”. The datediff function returns the difference between two specified dates in the time units that you specify: years, quarters, months, weeks, days, hours, minutes, or seconds. I want to convert this number to years,Months,and Days. DiffDate Calculates the difference. DATE_DIFF = 1. We’re calculating months of service in this example. Here is some T-SQL that gives you the number of years, months, and days since the day specified in @date. Syntax. The syntax for the MONTHS_BETWEEN function in Oracle/PLSQL is: MONTHS_BETWEEN( date1, date2 ) Parameters or Arguments date1 The first date used to calculate the number of months between. Javascript. You can't transform this value to date by to_date function. Returns a date string or the current date. Function. It has been tested on a wide range of years (including leap ones) and more than 700k combinations of dates (including end of every months). Viewed 20k times. If this query is executed between December 26 and December 31, you'll still. The DateDiff function returns how many seconds, months, years - whatever interval you specify between the first date (here 0) and the second date (here the current date). Hi tom, I want day, month, minute and years difference everyting in seconds. dividing by 365. Hot. Add a number of months (n) to a date and return the same day which is n of months away. 9. buf 1 declare 2 total_days integer; 3 total_weeks integer; 4 remaining_days integer; 5 begin 6 total_days := date '2014-12-16' - date '2014-12-01'; 7 total. 21. id = tp. 2188940092 Example 2 Date 1: 10th March 2011 Date 2: 1st Feb 2011 MONTHS_BETWEEN = 1. select datediff (q,'03-30-2005','04-01-2005') will return 1. The table contains the data about each staff member’s. . Getting the last 12 months from a specific date is easy and can be retrieved by the following command in SQL-server. I have the following query that I'm trying to get the length of service of a person at their company. For formatting functions, refer to Section 9. (floor ( (Base_DateDiff + 1 + Start_WeekDay) / 7)) counts the number of saturdays. Justin, the example which you gave, if that is the scenario I want the output as 1. Also, according to Oracle's documentation LAST_DAY returns a DATE. Returns the <date> with the specified number <interval> added to the specified <date_part> of that date. If date1 is later than date2, then the result is positive. Answer: You can use the months_between function and convert it easily yo years between and decades between two dates: months_between/12 = years between. Sum (r => EF. Table 9. The system calculates the number of complete months between given dates. The Question asked for "6 months from the system date". The format argument is optional. Date2Date. 1 - Find the total months count till today's date using DATEDIFF function -. A) Get the next weekday later than a date. *You may also use the DATEDIFF function. A number representing the input date between January 1, 1970 and Dec 31, 2037. DatePart. Tdy. Oracle Oracle Database Release 19 SQL Language Reference MONTHS_BETWEEN Syntax Description of the illustration months_between. You need to add 1 to the DATEDIFF function and it will work as you want. The week (wk, ww) datepart reflects changes made to SET DATEFIRST. PROJECTED_COMPLETION,. ). Also, you can check this for minutes : Oracle : how to subtract two dates and get minutes of the result. e in the future) rather than 1992 as probably intended. The first quarter is 1, the last one is 4. 1970年1月1日から2037年12月31日までの入力日を表す数値。. This page provides you with the most commonly used Oracle date functions that help you handle date and time data easily and more effectively. I want to convert this number to years,Months,and Days. In certain cases, such as string-based comparisons or when a result depends on a different timestamp format than is set in the session parameters, we recommend explicitly converting. DATEENTERED ,* from sometable S where S. g. When the reporting date month is the same as the target month you can get a round up Here is a PostgreSQL function with the exact same behavior as the Oracle MONTHS_BETWEEN function. For example the difference between 1st March 2011 and 3rd March 2012 is 1. date_open END. DATEADD ('week', 1, [due date]) Add 280 days to the date February 20, 2021. MonthDiff = DateDiff ("m", startdate, enddate) End If. Difference of two dates in months user637544 Jun 1 2009 — edited Jun 1 2009 i need to find the difference of two dates as the number of months: find the last day. In Oracle, You can use the MONTHS_BETWEEN function with TRUNC and MOD function as follows: SQL> SELECT 2 TRUNC(TRUNC(MONTHS_BETWEEN(SYSDATE, DATE '2014-08. However, since you have known start- and end-dates then you can find the number of full years between the two bounds and then use an INTERVAL DAY TO. created_date - adhh. Oracle equivalent to SQL Server/Sybase. getYear () * 12 + date1. Is there any simple way to calculate this in sql server 2005 . Oracle Help Center - MONTHS_BETWEENyou ca also use LAG analytical function to get the desired results as : Suppose below is your input table: id account_number account_date 1 1001 9/10/2011 2 2001 9/1/2011 3 2001 9/3/2011 4 1001 9/12/2011 5 3001 9/18/2011 6 1001 9/20/2011 select id,account_number,account_date, datediff(day,lag(account_date,1) over (partition by. Thanks in advance for any help; this has been driving us crazy for a few months now. Let’s factor it in! First, we will take the person’s birthday and will use the DATEADD( ) function. The difference in hours, minutes or seconds can be found by multiplying this number by 24, 24*60 or 24*60*60 respectively. From the inputs you got there are 123 months between the date of 07/03/2011 to 24/3/2021. SQL DATEPART. date or field. DATE_FORMAT () Format date as specified. This does it excluding the days out but date part rather than description. To create the rows, use the month generation technique above. Modified 7 years, 2 months ago. I was given code via an SR but it doesn't work (I'm able to save the code but when I try to look at the sample data, it just says "error"). Add a. DATEDIFF (MONTH, DATEADD (DAY,-DAY (startDate)+1,startDate),DATEADD (DAY,-DAY (startDate)+1,endDate)) Share. Here are the 10 federal holidays a year, almost one per month: New Year’s Day on January 1; Martin Luther King’s Birthday on the. In Oracle, MONTHS_BETWEEN(date1, date2) function returns the number of months between two dates as a decimal number. The MONTHS_BETWEEN () function is used to get the number of months between dates (date1, date2). SELECT DATEDIFF(day, '2018-03-13', GETDATE()) AS "Difference in days"; On that basis, let me explain the three arguments required in the DATEDIFF function syntax. DP_QUARTER returns the distance between the quarters capturing the input dates. SELECT DATEADD (month, 1, '20220730'); The below DATEADD will add 1 year to the provided date value, the year changed from 2022 to 2023. SELECT purch_id, (trunc (sysdate, 'YYYY') + interval '11' month + interval '24' day) - purch_date days_to_christmas FROM CS260USER. UPDATE Yes, he will get a 1 month difference even if it is only 1 day difference, but OP. The system always returns a positive number regardless of. Share. The month and the last day of the month are defined by the parameter NLS_CALENDAR. DATEDIFF( date_part , start_date , end_date) Code language: SQL (Structured Query Language) (sql) The DATEDIFF() function accepts three arguments: date_part, start_date, and end_date. e it takes the quarter in which the start date exists and subtracts it from the quarter in which the end date exists. From the Oracle documentation: MONTHS_BETWEEN returns number of months between dates date1 and date2. g. The schema is SYSIBM. When subtracting two date datatype values, the result is number of days. In my opinion the date diff is kind of subjective, especially on days. Current Month. CASE WHEN a. 997268. Write queries for continuous periods as explicit range condition. I have a creation date column in the table. Table 9. 0 is for 1/1/1900, and getdate is the current date --(i used a set date bc dates will change as this post gets older). Step-7: SQL Query to Calculate the Number of Months between two specific dates : Now let’s find the number of months between the dates of an order of ‘Maserati’ and ‘Ferrari’ in the table. (You can also subtract fractions of days, but that might be outside the scope of this answer. The syntax for the DATEDIFF function in SQL Server (Transact-SQL) is: DATEDIFF( interval, date1, date2 ) Parameters or Arguments interval. I have a creation date column in the table. i need to find the difference of two dates as the number of months: find the last day of the month of both the dates. 2323 days) multiply by 24 = hours, another 60 = minutes, another 60 = seconds. For example when I place 01/01/04 as the. Its answer is 2014-08-17. 1 + TRUNC (InstallDate) - TRUNC (InstallDate, 'IW') get 1 for mondays to 7 for sunday. 2425. by the way, Just new in DBeaver. EMPLOYEES; This is some old sample. And this may raise an issue for leapers (someone born on the 29th of Feb), as taken from Wikipedia: The effective legal date of a leapling's birthday in non-leap years varies between jurisdictions. You may need to change date format to match the a given date format and verify that 31 day months work for your specific scenarios. What's the function in Oracle that would be the equivalent to DATEDIFF in the SQL Server? On Oracle, it is an arithmetic issue: Select DATE1-DATE2 from dual Converting a raw number of days into a number of weeks and days is pretty simple. Getting the age in terms of YEARS and MONTHS is easy, but the tricky part is the the DAYS. This post has been answered by 630199 on Jun 1 2009. 1. In this Document. 365 / 365. 0. 4 Answers. (Oct 2006 - June 2005 = 16) DP_WEEK returns the distance between the weeks capturing the input. ORA-00937 when calculating a sub-value in an aggregate select statement. BaseDate. So, Feb-28 to Mar-28 is a month. to get the date one second before midnight of. I want something like this. In short. For example, with some sample dates: select months_between (date '2015-03-19', date '2012-01-06') as month_diff from dual; MONTH_DIFF ---------- 38. I know it exists in SQL Server. The dates do not have to be in the same format in the extract file, but the format of each must be supported. If date1 and date2 are either the same days of the month or both last days of months, then the. datediff() is not giving tHe result as I am working in Oracle. The following query selects all rows with a date_col value from within the last 30 days: . cust_field_nm eq "x_case_dte_dd" and datepart. 99. These are already in hour:minute:second format! with rws as ( select timestamp'2017-03-01 01:00:00' t1, timestamp'2017-03-01 02:34:56' t2 from dual ) select t2-t1 diff_interval from rws; DIFF_INTERVAL +00 01:34:56. NET and i have faced several problems that i could fix but i couldn't fix the following: I have a stored procedure that takes date in parameters The stored procedures calls to_date with the format : MM/DD/YY HH:MI:SS AM The. I am adding filter to OTBI report and want system to take first and last date of current month automatically. this will gives you the last 3 month date (from 1st of the month) WHERE date_column >= DATEADD (MONTH, DATEDIFF (MONTH, 0, GETDATE ()) - 3, 0) you have 3 date. Tom: 1. 2. datediff isn't a function in Oracle. In Oracle, dates are just numbers. 32 illustrates the behaviors of the basic arithmetic operators ( +, *, etc. You may: count the number of 24h elapsed time: day+1 - day = 1 day = 24h. There are many tricks to generate rows in Oracle Database. ) Startdate = 2014-04-03 enddate = 2013-04-03 Result should be 12 as OP said. I need the Oracle equivalent to the SQL Server DATEDIFF function to compute the difference between two dates. The MONTHS_BETWEEN function returns an estimate of the number of months between two arguments. (Oct 10, 2006 - June 14, 2005 = 69) In SQL Server, there is a function datediff with datepart 'q'/quarter which behaves as follows :--. HEH! One big difference you’ll find is that adding or subtracting two date values in Oracle leaves you with a number, not a date. Example. Then, it converts that result to a date, using the format 'yyyy-MM-dd'. I have an application which calculates age on the specific date completely that is in years-months-days . I want get number of day difference between that date and date of today. When the reporting date month is the same as the target month you can get a round upWe would like to show you a description here but the site won’t allow us. (The valid formats 1,7,10,11 will be described later. As you can see it means that year should be -1, and month 0. You can simply subtract two dates. HQL And datediff() Functions. DATEDIFF. SQL Server ignores that this is just one day. This previous question indicates that there is a date format in Oracle that would make your year 92 into 2092 (i. It should have been DATEDIFF NOT DATEADD with respect to the WEEK parameter. To answer your question to find all records that occurred last month. Assuming that a. For example: Todays date: Jun 13, 2017. This post has been answered by BluShadow on Nov 18 2010. (The valid formats 1,7,10,11 will be described later. Syntax The syntax for the MONTHS_BETWEEN function in Oracle/PLSQL is: MONTHS_BETWEEN ( date1, date2 ) Parameters or Arguments date1 The first date used to calculate the number of months between. DATEDIFF with examples DATEDIFF function accepts 3 parameters, first is datepart (can be an year, quarter, month, day, hour etc. Modified 9 years ago. select trunc ( (sysdate - to_date ('2012-02-28 15:20', 'YYYY-MM-DD hh24:mi')) / 24) from dual; You should have multiplied by. using the following expression. The table contains the data about each staff member’s employment date. Use DATEADD (): where HireDate < dateadd (year, -3, GETDATE ()) DATEDIFF () does not do what you think it does. 365 / 365. 2 -Increment by 1 into total months count -. How to generate days, weeks, or months between two dates in Oracle Database June 1, 2021 | 25 minute read Chris Saxon Developer Advocate There are. I apologize for the misinformation. I tried this selectExample: Oracle MONTHS_BETWEEN() Function - w3resourceHow to calculate age in T-SQL with years, months, and days. Oracle equivalent to SQL Server/Sybase DateDiff. So, for example: WHERE date2 - date1 BETWEEN 60 AND 90. For example, you might use DateDiff to calculate the number of days between two dates, or the number of weeks between today and the end of the year. This field level rule lets you display the difference between two dates. In Oracle SQL, I want to display the difference between two dates in the format 'x years y months z days'. SELECT DISTINCT Test, FIRST_VALUE (CONVERT(DATE, datetime)) OVER (ORDER BY datetime DESC) StartDate,. The first week of the year is 1. Syntax The syntax for the MONTHS_BETWEEN function in. The following example illustrates how to use the. FWIW, you don't need to use floor. There are similar questions on the site; however as I could see, none of them asks for an output as. Syntax:This expression: to_date(SYSDATE, 'yyyy-MM-dd') doesn't make sense. ----- we travel not to escape life but for life not to escape us. you can check against last 90 days. SELECT months_between ( date_1, date_2 )/12 years_between FROM employee. ) and the. You could, of course, write your own function and call that. SELECT DATEADD ( quarter, DATEDIFF. The idea is to find how many years, months, and days they have served there. I tried going off of something like this: Select records from SQL Server if greater than 6 months but I get the error: Subquery returned more than 1 value. DATEDIFF (MONTH, DATEADD (DAY,-DAY (startDate)+1,startDate),DATEADD (DAY,-DAY (startDate)+1,endDate)) Share. What I am using is (Today-Dob)/30/12, but this is not accurate as some months have 31 days. Since you asked for days, I'll leave it to you to truncate this to 37 days or round it to 38. ReturnDate)) + ' days') ELSE CAST(DATEDIFF(day, Trips. Modified 8 years ago. DATEDIFF calculates the difference between two dates - it doesn't add day or months to an existing date. type = 'P')) AS total_hour FROM a INNER JOIN ac ON ac. create table test_table ( customer_num NUMBER, card_number char(2), card_issue_date DATE, card_expire_date DATE ). SELECT TIMESTAMPDIFF (MONTH, '2012-05-05', '2012-06-04') -- Outputs. Here’s the step by step: Use the AGE function to calculate the difference between the end date and start date. Select Sysdate-Birth_date from Employees; the query return the number of days between the two dates. 00. Modified 11 years, 3 months ago. sql-server-2008. Calculate the last date of the month is quite simple calculation -. Modified 3 years, 4 months ago. When you multiply it by 24 (number of hours in a day), 60 (number of minutes in an hour) and 60 (number of seconds in a minute), the result is number of seconds (DIFF_SECS). You have to cast it first, using to_date: select to_date ('2000-01-01', 'yyyy-MM-dd') - to_date ('2000-01-02', 'yyyy-MM-dd') datediff from dual ; The result is in days, to the difference of these two dates is -1 (you could swap the two dates if you like). Assuming that a. current_time() returns the date and time on the database client side. ROUND returns date rounded to the unit specified by the format model fmt. DateDiffDay (r. The application passes in two parameters: a string representing the number of the desired month (i. The schema is SYSIBM. There are MANY way to compute the number of years between two dates in Oracle SQL. Of course, if you need days instead of months, you can simply subtract one date from another, e. 1. Q&A for work. DATEDIFF(interval, date1, date2) Parameter Values. This function adds a specified number of days, months, and years to a given date. T was trying do calculate age as on todays date in ORACLE but after a lot of brain storming i didn't get it. Using SQL Server, I would do something like: select dateadd (month, num, firstdate) as mon from (select row_number () over (partition by NULL order by (select NULL)) as num from Information_Schema. In SQL Server 2012 you can use EOMONTH (Transact-SQL) to get the last day of the month and then you can use DAY (Transact-SQL) to get the number of days in the month. A) Get the difference in months of dates on the same day The following example returns a difference in months between two dates: July 01 2017 and January 01 2017: SELECT MONTHS_BETWEEN ( DATE '2017-07-01', DATE '2017-01-01' ) MONTH_DIFF FROM DUAL; Code language: SQL (Structured Query Language) (sql) The result is 6 months as shown below: SQL> with 2 test (start_date, end_date) as 3 (select date '2020-10-01', 4 date '2020-11-02' 5 from dual 6 ), 7 calendar as 8 (select start_date + level - 1 datum 9 from test 10 connect by level <= end_date - start_date + 1 11 ) 12 select to_char(datum, 'yyyy. début)/365) Here is my table and the result in the 'montant_annuel' column:The datediff function make my query run very slow (16s for 11 records), and cost also very high (~43k). Justin, the example which you gave, if that is the scenario I want the output as 1. Viewed 20k times. When a user enters JAN 2009 - I want the worksheet to show data from Jan, Feb, Mar, Apr, May and June (2009). The difference between two dates (in oracle's usual database product) is in days (which can have fractional parts). Sorted by: 3. 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. date_from, evnt. @asfasas You can always convert the results using a proper mask. This is going to be short:. SQL Retrieve the records of previous month. Factor by 24 to get hours, 24*60 to get minutes, 24*60*60 to get seconds (that's as small as dates go). Answer: Oracle supports date arithmetic and you can make expressions like "date1 - date2" using date subtraction to get the difference between the two dates. The next example will show the differences between two dates for each specific datapart and abbreviation. As shown clearly in the result, because 2016 is the leap year, the difference in days between two dates is 2×365 + 366 = 1096. FLOOR (DATEDIFF (DAY, date_of_birth, reference_date) / 365. Examples of Results in Months. You can't use aliases you created in the SELECT clause elsewhere in the same SELECT clause, so you need to place your FIRST_VALUE() and LAST_VALUE() functions within the DATEDIFF() function:. The days are in two different, adjacent months, so the answer is 1 month difference. 00. (CASE WHEN Trips. sql. 3. Summary: Hi Team, I am scheduling an OTBI report. then just use it in the script eg. (Quarter 4, 2006 - Quarter 2, 2005 = 6) DP_MONTH returns the distance between the months capturing the input dates. SELECT --Start with total number of days including weekends (DATEDIFF (dd,@StartDate,@EndDate)+1) --Subtact 2 days for each full weekend (DATEDIFF (wk,@StartDate,@EndDate)*2) --If StartDate is a Sunday, Subtract 1 ELSE 0 END) --If EndDate is a Saturday, Subtract 1 FROM dual. This command prints the order date in the specified format. If they are identical down to the second then, presumably, returning 0 is the right answer. SQL Server DATEDIFF ( DATEPART , STARTDATE , ENDDATE ) Example: Select Datediff(mm,column1,column2) Above script will output difference in months, so based. Table 9. 1. dbeaver. CODE = 'CONTACT_CLIENT' THEN a. Conversion between time units is also allowed; you can add, subtract, or compare dates by using days and state. Here's an example. That link is not for the Oracle database, it's for JavaDB (Derby). I have to get the date from the system and calculate the date difference in days. EXTRACT the number of years from the interval. id = a. This is the reason we cannot apply direct addition or subtraction on date. In PostgreSQL there are basically 2 functions to do the same, as we have both date_part and extract: SELECT current_date AS ACTUAL_DATE, EXTRACT (DAY FROM current_date) AS ACTUAL_DAY, EXTRACT (MONTH FROM current_date) AS ACTUAL_MONTH, EXTRACT (YEAR FROM current_date) AS ACTUAL_YEAR. What is elapsed time in DB? DB Time is the Oracle server process CPU consumption and all non-idle wait time. We will use the below date for the examples. If date1 is earlier than date2, then the result is negative. SELECT DATEDIFF (month,'2011-03-07' , '2021-06-24'); In this above example, you can find the number of months between the date of starting and ending. Here's the code provided by Tom Kyte at. Modified 9 years, 7 months ago. Again, under Column Tools you have the option for Sort by column. Syntax DATEDIFF (datepart ,startdate ,enddate) datepart Abbreviations year. So, there’s. How To turn a string with "pipe-separated" values into individual rows in Oracle PL/SQL. When you subtract two dates in Oracle, you get the number of days between the two values. SQL is also known as Structured Query Language. PROJECTID, PROJ_TASK. この数値は、1970年1月1日の深夜から経過した秒数です。. Share. sql. date]-90) - my comparison subtracts 90 days from the max date Yes, I know,. You have the option to change the data type there. As you can see the EOMONTH function takes into account leap year. MANAGER_ID, PROJECTED_DATE. 3. User-1629274867 posted Hi, I have replaced MS Oracle Client with OPD. Conversion among time units is also allowed; you can add, subtract, or compare dates by using days and state. For example, from 2/10 to 3/10 is considered one month, and from 2/10 to 3/15 is also considered one month. SELECT DATE '0016-08-03' - DATE '2016-07-08' FROM dual;-- -730461. for the month differnce the standard sql is DATEDIFF, in this function you must pass 3 params, if you must calculate the difference from 2 columns, c1 and c2, you must do this query SELECT DATEDIFF(month,c1 , c2) FROM T WHERE. So far I have this: SELECT evnt.