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http://dba-oracle.com/t_add_hours_to_oracle_date.htm#:~:text=Answer%3A%20To%20add%20hours%20to%20an%20Oracle%20date,1%20is%20one%20day%20ahead%20%28exactly%2024%20hours%29
https://stackoverflow.com/questions/30167311/pl-sql-adding-hours-to-timestamp-parameter
to_timestamp (dateFrom,'mm/dd/yyyy hh24:mi:ss') (substitute the appropriate mask based on the format of your input parameter) Then just add 7/24. to_timestamp (dateFrom,'mm/dd/yyyy hh24:mi:ss') + 7/24; Adding 1 adds a full day, so adding 1/24 adds 1 hour. This can also be done with the INTERVAL operator:
https://www.tutorialspoint.com/plsql/plsql_date_time.htm
http://dba-oracle.com/t_add_hours_to_oracle_date.htm
Answer: To add hours to an Oracle date you can this simple query: select sysdate, sysdate + (1/24*5) "5 hours" from dual; The formula (1/24*5) is explained as follows: sysdate + 1 is one day ahead (exactly 24 hours) - divided by 24 gives one hour * 5 multiply by 5 to get the 5 hours. You can also add 5 hours to a date this way: (60 * 5)
https://www.geeksforgeeks.org/useful-date-and-time-functions-in-pl-sql/
https://www.techonthenet.com/oracle/functions/to_date.php
Hour of day (1-12). HH12: Hour of day (1-12). HH24: Hour of day (0-23). MI: Minute (0-59). SS: Second (0-59). SSSSS: Seconds past midnight (0-86399). AM, A.M., PM, or P.M. Meridian indicator: AD or A.D: AD indicator: BC or B.C. BC indicator: TZD: Daylight savings information. For example, 'PST' TZH: Time zone hour. TZM: Time zone minute. TZR: Time zone region.
https://docs.oracle.com/cd/E17952_01/mysql-5.6-en/date-and-time-functions.html
mysql> SELECT HOUR('10:05:03');-> 10 mysql> SELECT HOUR('272:59:59');-> 272 LAST_DAY(date) Takes a date or datetime value and returns the corresponding value for the last day of the month. Returns NULL if the argument is invalid.
https://stackoverflow.com/questions/12916611/extract-hour-in-24-hour-format
So the simple 'fix' is to set the format to something that does recognise 24-hours: SQL> alter session set nls_timestamp_format = 'DD-MON-YYYY HH24:MI:SS'; Session altered. SQL> select extract (hour from cast (to_char (sysdate, 'DD-MON-YYYY HH24:MI:SS') 2 as timestamp)) from dual; EXTRACT (HOURFROMCAST (TO_CHAR (SYSDATE,'DD-MON-YYYYHH24:MI:SS')ASTIMESTAMP)) ------------------------ …
https://www.techonthenet.com/oracle/functions/to_timestamp.php
Hour of day (1-12). HH12: Hour of day (1-12). HH24: Hour of day (0-23). MI: Minute (0-59). SS: Second (0-59).
https://www.techonthenet.com/oracle/functions/trunc_date.php
The unit of measure to apply for truncating. If the format parameter is omitted, the TRUNC function will truncate the date to the day value, so that any hours, minutes, or seconds will be truncated off. It can be one of the following values: Unit. Valid format parameters. Year. SYYYY, YYYY, YEAR, SYEAR, YYY, YY, Y. …
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