New Zealand Auto-close time is out by one hour, in CA SDM

Document ID : KB000112492
Last Modified Date : 30/08/2018
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Question:
Before New Zealand had daylight savings on Sunday the 24th of September, our Auto-close feature was working perfectly.

Now the Auto-close activity log entry showing 'Automatic closure will occur at: . . .' is showing  one hour early.

However, it is closing at the correct time.

Experimentation has been done with the New Zealand Timezone fields 'Daylight Saving Time Delta' and 'Use as System Default.
Also removing the line @NX_AUTOCLOSE_SYSTEM_GENERATED=Yes from the NX.env file.
SDM has been recycled at each change.

The only change that has occurred is that the Activity Log now shows the right time, but the actual Auto-close occurs one hour out.
Environment:
SDM 12.9, 14.1 and 17.1.
Answer:
Resolution

The New Zealand Timezone "Daylight Savings Time Delta" field needs to be set to "3600" (no units). This is one hour in seconds.

The start and end times need to be adjusted to match the New Zealand Daylight Savings Time period.

This is confirmed as working as expected in ITSM 17.1.

SDM 12.9 reached End of Service at March 31, 2018, and so any incorrect behaviour with this version can only be corrected manually through the interface at this time, where possible.
No patches will be provided to update the data values or Timezone behaviour.

NOTE - What to do if an out-of-the-box Timezone contains incorrect information

Due to the large number of Timezones around the world, and the occasional changes that occur to their definitions, it may be necessary to update the default Timezones that are provided out-of-the-box with CA Service Desk Manager (ITSM). 

If you believe that a standard Timezone definition is wrong, please log a CA Support issue advising what it should be set to.
It would be very helpful to attach a link to an official source to confirm this data when creating this issue, such as a local government website.
This is because if CA issues a global change to the data, it will impact all sites in the future.

Otherwise, if the change is not official, but seems to be required, please create a post to CA Communities - CA Service Management to record this for your country, as an aid to other sites. Thank you.
 
Additional Information:
Auto-close is sometimes documented as "Auto Close" or "Autoclose."

ITSM 17.1 Timezone Setup

ITSM 17.1 Timezone Field Definitions

Understanding, Configuring and Troubleshooting CA Service Desk Manager 'Auto-close' Functionality