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Day Light Saving Changes in USA
- Summary :
- Daylight saving time is changing in USA this year due to a law passed by US congress . Earlier light saving in USA happened on first Sunday of April and ended on last Sunday of November but from current year (2007) onwards the starting and ending days are going to change . The day light saving will start two weeks earlier and end one week later as per the following table.
| Year | Start | End |
| Last Year 2006
|
|
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| This year 2007 |
|
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*Start and end date is determined by the day of the week (Sunday ) hence only day is fixed for the changes and dates may change every year .
- Impact of Changes :
- This change will impact computers and devices which are based on calendar for date and time and will need correction for this change . Since this change is being made in US & its territories the computers and devices which are located in US or being operated on US time are impacted.Canada is also observing these changes for some parts of Canada changes will also be applicable to Canada .
Computers systems & devices can be impacted in the following way :
- 1. Wrong current time is displayed .
- 2. Jobs or process scheduling can get disturbed due to time change.
- 3. Transaction update may have problems due to wrong current time.
- 2. Jobs or process scheduling can get disturbed due to time change.
- For example Airlines schedules , landing , process control in a
manufacturing plant , computerized transaction updates , computerized process
control may show problems .
- On personal side it may lead to some missed meetings in the office , missed flights or trains when the changes starts and ends.
- Impact on computer Systems
:
- Two main components are impacted :
- 1.Java and java based applications
- 2,Operating Systems
- Problems Affecting Java
Applications
- The Java Runtime Environment (JRE) stores rules about DST observance all around the globe. Older JREs will have outdated rules until they are patched with latest rules . As a result, applications running on an older JRE may report incorrect time from March 11, 2007 to April 2, 2007 and from October 29, 2007 to November 4, 2007.
- Operating Systems :
- In computers time zone information is maintained by the Operating systems and they will have to be patched to reflect the new time changes . The patch will be a new time zone file with updated entries for US time zones for day light saving times.
Following are the documentation & download links for Java
| JAVA | |
| Versions not impacted by this change |
|
| Version 1.4 or later |
Modify the time zone data within your existing JRE. Get the "tzupdater" tool from the following location . |
| JAVA Day Light Saving FAQ | US DST FAQ |
Following table gives links to the available information for the day light saving for different products .
| Company | Information links |
| SUN | |
| IBM | |
| HP | |
| SCO | |
| Novell | |
| Red Hat Enterprise Linux | |
| SUSE Enterprise Linux | |
|
BEA |
|
| Oracle | |
| Apple Mac OS X
10.4
|
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| Microsoft |
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