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https://community.oracle.com/tech/developers/discussion/899728/subtract-1-hour-from-date#:~:text=will%20subtract%201%20hour%20from%20SYSDATE.%20In%20Oracle%2C,hour%2C%20SYSDATE%20-%201%2F24%2F60%20subtracts%20a%20minute%2C%20etc.
https://stackoverflow.com/questions/30772434/how-to-subtract-hours-from-a-date-in-oracle-so-it-affects-the-day-also
date - n will subtract n days form given date. In order to subtract hrs you need to convert it into day buy dividing it with 24. In your case it should be to_char(sysdate - (2 + 2/24), 'MM-DD-YYYY HH24'). This will subract 2 days and 2 hrs from sysdate.
https://community.oracle.com/tech/developers/discussion/899728/subtract-1-hour-from-date
Answers. will subtract 1 hour from SYSDATE. In Oracle, when you add or subtract a number to a date, the unit is days. So SYSDATE + 1 adds 1 day. To add some other increment, you just multiply or divide appropriately, i.e. SYSDATE - 1/24 subtracts an hour, SYSDATE - …
https://community.oracle.com/tech/developers/discussion/1010380/subtracting-dates
If they're already dates you can skip the to_date function and go straight for: SELECT (rb.booking_end_date - rb.booking_start_date) days_difference FROM booking WHERE (rb.booking_end_date - rb.booking_start_date) <= 2; If you want the time of the day to be taken into account when calculating the difference.
https://docs.oracle.com/cd/E17952_01/mysql-5.6-en/date-and-time-functions.html
ADDDATE(date,INTERVAL expr unit), ADDDATE(expr,days) When invoked with the INTERVAL form …
https://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:9533411800346926170
SQL> select abs(24*extract(day from diff)+extract(hour from diff)) hrs from ( 2 select 3 to_timestamp_tz( '28-JAN-2016 10:30:00.000000 PM +00:00', 'dd-mon-yyyy hh:mi:ssxff PM tzh:tzm') - 4 to_timestamp_tz( '29-JAN-2016 10:30:00.000000 PM +00:00', 'dd-mon-yyyy hh:mi:ssxff PM tzh:tzm') diff 5 from dual 6 ); HRS ----- 24
https://asktom.oracle.com/Misc/DateDiff.html
With Oracle Dates, this is pretty trivial, you can get either TOTAL (days, hours, minutes, seconds) between 2 dates simply by subtracting them or with a little mod'ing you can get Days/Hours/Minutes/Seconds between. For example: SQL> set serveroutput on SQL> SQL> declare 2 a date; 3 b date; 4 begin
http://dba-oracle.com/t_date_difference.htm
Once you have the date difference, you can use simple techniques to express the difference in days, hours, minutes or seconds. The minus sign is used to compute the difference between two dates: SQL> select 24 * (to_date('20014-06-19', 'YYYY-MM-DD') - to_date('2010-07-07', 'YYYY-MM-DD')) date_difference from dual; SQL> SELECT to_date('2015-08-05','YYYY-MM-DD')-to_date('2010-06 …
https://www.akadia.com/services/ora_date_time.html
You can add and subtract number constants as well as other dates from dates. Oracle interprets number constants in arithmetic date expressions as numbers of days. For example: SYSDATE + 1 is tomorrow; SYSDATE - 7 is one week ago; SYSDATE + (10/1440) is ten minutes from now.
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