If you have recently configured a new Domino server on the IBM i, don’t forget to add the DSTLAW parameter to the NOTES.INI file. Otherwise, you will experience invalid time stamps for one week, during the one week extension from the previous ending period of DST. In the Spring, your timestamps could be off one hour for three weeks as Daylight Savings observation begins three weeks earlier than previously observed dates.
The DSTLaw parameter is a requirement for all Domino servers running on the i5/OS that observe daylight savings. It identifies the start and end dates for the Daylight Savings Time period.
In the United States, the correct value is DSTLAW=3,2,1,11,1,1 (interpreted as starting the second Sunday in March and ending the first Sunday in November.
3,2,1 = third month, second week, first day
11,1,1 = eleventh month, first week, first day
On the IBM i, this parameter is not added automatically when configuring a new server. Therefore, it must be manually added to the NOTES.INI file. A Domino server restart is required to activate this change.