Why Do `SYSDATE` and `CURRENT_TIMESTAMP` Show Different Times in Oracle?

Understanding Time Discrepancies between CURRENT_TIMESTAMP and SYSDATE in Oracle

When executing the SQL query SELECT SYSDATE, CURRENT_TIMESTAMP FROM DUAL in Oracle 10g, users may encounter variations between the output of these two functions. SYSDATE represents the system date and time on the database server, while CURRENT_TIMESTAMP displays the current time in the session's time zone.

The disparity arises when the client session's time zone differs from the server's. In this case, it appears that the server is operating with a 4:00 time zone, whereas the client session uses a 4:30 time zone. Consequently, CURRENT_TIMESTAMP reflects the adjusted time for the session's time zone, while SYSDATE remains the system time.

Additionally, slight time differentials may occur if server clocks are desynchronized. However, based on the provided information, this does not seem to be a contributing factor.

It's important to be aware of the distinct nature of these functions and their potential for time variations when conducting operations across different time zones.

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