DST and NT 4.0

nzdst — Thu, 06 Sep 2007 09:17:00 GMT

DISCLAIMER - This is completely unsupported by Microsoft and therefore we offer no warranty or support if you choose to utilise information in this posting. This has not been tested by Microsoft as it is outside of extended support and therefore out of our test matrix. Please backup your registry before making any changes to ensure you have a known good restore point. As always please ensure you test this in a lab environment before deploying to production systems.

NT 4.0 and earlier.

REGEDIT4

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\New Zealand Standard Time]

"Display"="(GMT+12:00) Auckland, Wellington"

"Dlt"="New Zealand Daylight Time"

"Std"="New Zealand Standard Time

"MapID"="78,79"

"Index"=dword:00000122

"TZI"=hex:30,fd,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,04,00,00,00,01,00,03,00,00,\

00,00,00,00,00,00,00,09,00,00,00,05,00,02,00,00,00,00,00,00,00

Testing the update:

1.	Change the date/clock to September 30, 2007, 1:59am and verify that the clock advances one hour (instead of moving to 2am it moves to 3am). This is the new (2007) DST start date.
2.	Change the date/clock to October 7, 2007 at 1:59am and verify that the clock does not adjust for DST (Simply moves to 2am). This is the 2007 DST start date.
3.	Change the date/clock to March 16, 2008 at 1:59am and verify that the clock does not adjust for DST (Simply moves to 2am). This is the 2008 DST end date.
4.	Change the date/clock to April 6, 2008 at 2:59am and verify that the clock goes back one hour to 2:00am (instead of 3am). This is the new (2008) DST end date.

New Zealand 2007 Daylight Saving Changes : NT 4.0

DST and NT 4.0