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https://community.oracle.com/tech/developers/discussion/899728/subtract-1-hour-from-date#:~:text=SYSDATE%20-%20INTERVAL%20%271%27%20HOUR%20will%20subtract%201,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://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.
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://riptutorial.com/oracle/example/7493/date-arithmetic---difference-between-dates-in-days--hours--minutes-and-or-seconds
Example #. In oracle, the difference (in days and/or fractions thereof) between two DATE s can be found using subtraction: The difference in hours, minutes or seconds can be found by multiplying this number by 24, 24*60 or 24*60*60 respectively.
http://www.dba-oracle.com/t_date_arithmetic.htm
When performing Oracle date arithmetic, it might be tempting to use sophisticated conversion functions to convert a data, but we will see that this is not the most elegant solution: round (to_number (end-date-start_date)*24)- elapsed hours. round (to_number (end-date-start_date)*1440)- elapsed minutes.
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.
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