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https://community.oracle.com/tech/developers/discussion/899728/subtract-1-hour-from-date#:~:text=In%20Oracle%2C%20when%20you%20add%20or%20subtract%20a,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://hoursfinder.com/o-hours/oracle-subtract-dates-to-get-hours.html
Sep 19, 2016 · If you subtract 2 dates in Oracle, you'll get the result expressed as a fraction of the number of days. To get the number of minutes between 2 dates, you multiply by 1440, i.e. SELECT (SYSDATE - DATE'2015-09-16') * 1440. Time difference in hours Oracle Community.
https://community.oracle.com/tech/developers/discussion/899728/subtract-1-hour-from-date
SYSDATE - INTERVAL '1' HOUR 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 - 1/24/60 subtracts a minute, etc.
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 …
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://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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