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Changes to Daylight Saving Time will affect IBM Tivoli Directory Integrator (TDI)

Flash (Alert)


Information about the impact of the US Energy Policy Act of 2005, which changes the effective dates of US Daylight Saving Time (DST) in 2007 for the US. Actions are required to address this issue in IBM Tivoli Directory Integrator (TDI).


A provision of the United States Energy Policy Act of 2005 extends DST by four weeks, beginning in 2007. Other countries (Australia, Canada, Bermuda) are making similar changes to DST rules.

Beginning in 2007, the new DST start and end dates for the US will be:

  • Start date: Second Sunday of March (11 March 2007)
  • End date: First Sunday of November (4 November 2007)

Systems or applications that process dates and times could be affected by this change. If not addressed, time and date calculations could be incorrect.

How do I know if my systems could be affected?

All software which makes date or time calculations may be effected, including the operating system.

What could happen if I do not update my systems?

Essentially, the system clocks will simply be off by an hour for the few weeks between the new DST start date (in the US) and the old DST start date (March 11 to April 1, 2007 in the US). Other than log file time stamps being 1 hour off for those 3 weeks, there would should be no noticeable impact.

What do I need to do to protect my Tivoli Directory Integrator?

Like most software, the IBM Tivoli Directory Integrator (TDI) relies upon 2 main systems to provide time and date services:

  • The operating system runtime environment
  • The JAVA Runtime Environment (JRE)

Fixes for the operating system and JAVA Runtime Environment (JRE) must be applied separately.

Fixes for the Operating System:

Please consult your operating system vendor for the required updates.

Fixes for the JAVA Runtime Environment (JRE):

Please see

Document information

More support for: IBM Security Directory Integrator

Software version: 5.2.0, 6.0, 6.1

Operating system(s): All Platforms

Reference #: 1250910

Modified date: 17 November 2009