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Egypt cancels DST in 2015 - Impact on Oracle RDBMS (Doc ID 2003801.1)

Last updated on JANUARY 06, 2020

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Database - Standard Edition - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.



To help you see if your database is affected by the Egyptian Government decision to not go to DST in 2015 and to see if you actually need a DST update (= "DST patch") or not for Oracle RDBMS.

Egypt implemented Daylight Saving Time (DST) during summer the last eyars.

Instead of going to DST as previously planned (= forward one hour at midnight between Thursday, April 30 and Friday, May 1, 2015 ), the Egyptian Government has decided not to make further changes to the clock in future years and use UTC+02:00 all year.

For Questions/official statements about the DST change itself, please contact the Egyptian Government .

The affected timezones in Oracle are :

"Egypt" and "Africa/Cairo"

The changed timezone rules are in IANA Time Zone Data v. 2015d and later ( ).


Anyone who may be using the Egyptian timezones

The Oracle kernel itself is also not impacted by the OS/system clock changes (or for that matter Oracle DST patches). <Note:1013279.6> How Does Daylight Savings Time Affect The Database Kernel?

Used abbreviations:
TZ: TimeZone
TSTZ: TimeStamp with Time Zone
TSLTZ: TimeStamp with Local Time Zone


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In this Document
 1) The DATE datatype and SYSDATE / SYSTIMESTAMP
 2) Stored data using TimeStamp with (Local) Time Zone datatype.
 3) TimeStamp with Time Zone columns are used, how do I see if Egyptian named timezones are stored?
 4) Database timezone and Session timezone
 5) Oracle RDBMS DST patches and this change.
 7) Java in the Database home
 8) Other Oracle software (Enterprise Manager , Oracle Applications etc)
 9) Will any data stored in DATE, TIMESTAMP, TIMESTAMP WITH (LOCAL) TIMEZONE columns be affected by changing the server OS timezone?

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