"DST will now start three weeks earlier and end one week later than in previous years as a result of the Energy Policy Act of 2005, which extended DST in the US to conserve energy. Beginning in 2007, DST will start at 2:00 a.m. on the second Sunday of March (instead of the first Sunday of April) and end at 2:00 a.m. on the first Sunday of November (instead of the last Sunday of October). This means that DST will begin on March 11, 2007 (instead of April 1, 2007) and end on November 4, 2007 (instead of October 28, 2007).
As usual, at the beginning of DST, one hour effectively disappears as 1:59 a.m. is followed by 3 a.m. At the end of DST, a duplicate hour appears as 1:59 a.m. is followed by 1:00 a.m., meaning that the 1:00 a.m. hour happens twice.
Because there are many types of medical devices and systems with clocks and clock-related features such as timers that were sold before the DST rule changes, e.g. they were designed with the old start and end DST dates, it is unknown whether these devices and systems will operate correctly with the new 2007 DST start and end dates.
Internal clocks in devices and systems usually change automatically for DST based on values set internally or interactions with other devices, e.g., servers. Some devices and systems may rely on incorrect values for DST starting and ending dates if the device manufacturers have not patched or fixed their devices to use the new dates"
- FDA Article
- 2007 Time Zone Changes Will Impact Many Computers in Canada, the United States and Bermuda
- Are You Prepared for DST 2007? Considerations for 2007 changes
- Daylight Saving Time — The Year 2007 Problem
- Change in Daylight Saving Time Effective 2007 by Mary Salvas on last edited
- Techies Working To Stay Ahead Of Y2K7 Bug Daylight Saving Change Challenges Computer Programmers, KETV News.
- Daylight Saving Time May Bite the Out-of-Date by Andrew Laurence, 2007-01-29 (followup Daylight Saving Time Saved, by Andrew Laurence 2007-02-19)
- New 2007 Rules for Daylight Savings Time
- How to configure daylight saving time for the United States in 2007