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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,days.%20So%20SYSDATE%20%2B%201%20adds%201%20day.
https://stackoverflow.com/questions/30772434/how-to-subtract-hours-from-a-date-in-oracle-so-it-affects-the-day-also
I'm trying to subtract date from Oracle so it even effect the day as well. For example, if the timestamp is 01/June/2015 00 hours and if I subtract 2 hours, I want to be able to go to to 31/May/2014 22 hours. I tried. to_char(sysdate-(2/11), 'MM-DD-YYYY HH24') but it only subtracts the hour; it does not touch the day itself.
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 form …
https://stackoverflow.com/questions/11970311/sql-select-subtract-date-time-with-date-time
I have 2 different fields from a table and both have same format of timestamp. 7/18/2012 10:19:48 AM and 7/18/2012 10:20:46 AM How can I subtract two timestamp to get the duration in time.
https://stackoverflow.com/questions/1096853/calculate-difference-between-2-date-times-in-oracle-sql
This answer applies to dates represented by the Oracle data type DATE. Oracle also has a data type TIMESTAMP, which can also represent a date (with time). If you subtract TIMESTAMP values, you get an INTERVAL; to extract numeric values, use the EXTRACT function.
https://www.oracletutorial.com/oracle-date-functions/
http://dba-oracle.com/t_date_difference.htm
Answer: Oracle supports date arithmetic and you can make expressions like "date1 - date2" using date subtraction to get the difference between the two dates. Once you have the date difference, you can use simple techniques to express the difference in days, hours, minutes or seconds.
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