The Graduate Center, CUNY

Daylight Saving Time

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(NOTE: For more information on why this article is called "Daylight Saving Time" and not "Daying Savings Time" see here.


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The 2007 Daylight Saving Time

Effective: March 11, 2007

Starting in 2007, most of the United States and Canada will observe Daylight Saving Time from the second Sunday in March to the first Sunday in November, with transitions typically at 02:00 local time. The 2007 US change was part of the Energy Policy Act of 2005.

The Energy Policy Act of 2005 amends the Uniform Time Act of 1966 by changing the start and end dates of daylight saving time starting in 2007. Clocks will be set ahead one hour on the second Sunday of March (March 11, 2007) instead of the current first Sunday of April (April 1, 2007). Clocks will be set back one hour on the first Sunday in November (November 4, 2007), rather than the last Sunday of October (October 28, 2007).

This change WILL require action to ensure your electronic devices continue to function normally.


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Updates From The Graduate Center

Update 2 - March 9th, 2007

IT staff will apply software updates to all GC systems under the recommendation of associated manufactures on Saturday, March 10, 2007 beginning at 9:00AM.

As a result, all GC network access including: e-mail, network drives, internet and remote services will experience intermittent interruptions throughout the day.

We appreciate your patience and cooperation as we prepare for Daylight Savings Time.


Update 1 - February 23rd

The GC’s computer system clocks will be reset for DST on 3/11/2007. Some GC mailboxes are not “aware” of the new start date of DST and automatically adjust the meeting time. This will cause a problem of meetings occurring during the extended DST period of 3/11/2007 through 4/1/2007 displaying 1 hour later than originally scheduled for the affected mailboxes. A meeting scheduled for 1PM on 3/15/2007 will show as 2PM for those with the problem and 1PM for those without. We are running a background process on the email server that should fix this problem by early next week. There is also a Time Zone Date Update tool that can be run at an affected GC computer to fix the problem right away.

However we urge everyone to look at appointments scheduled after 3/11/2007 to ensure that they remain in the proper time slot. To minimize confusion for users during the extended DST period, follow these steps:

  1. When a meeting is organized during the extended DST period, write the correct meeting time in the subject line or the body of the message. For example, include the following text in the subject line or the body of the message: Project planning meeting – 8:30 a.m. EST
  1. Consider any calendar items in the extended DST period to be suspect. If you are not sure, verify the correct time with the organizer. Of course, notify IT of any concerns you may have or anomalies that you observe.


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Mac OS X Updates

Choose "Software Update" from the Apple Menu to make sure your Mac is up to date. Or, visit the following links for more information and to download the updates:


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Microsoft Updates

The following Microsoft products are affected by daylight saving time:

Microsoft Windows

  • Windows Server 2003
  • Windows Server 2003 Service Pack 1
  • Windows XP Service Pack 2
  • Windows XP Service Pack 1
  • Windows XP
  • Windows 2000
  • Windows NT4.0
  • Windows Mobile
  • Windows CE

Microsoft Exchange Server

  • Exchange Server 2003 Service Pack 2
  • Exchange Server 2003 Service Pack 1
  • Exchange Server 2000/Exchange Conferencing Server 2000
  • Exchange Server 5.5
  • Exchange Server 2003 Lotus Notes Connector
  • Exchange versions out of mainstream support
  • Exchange Update tool

Microsoft Office

  • Outlook 2003
  • Outlook 2002
  • Outlook 2000

Windows SharePoint Services

  • SharePoint Services 3.0
  • SharePoint Services 2.0

SQL Server Notification Services

  • SQL Server 2005 Notification Services
  • SQL Server 2000 Notification Services

Microsoft Dynamics CRM

  • CRM 3.0

Office Live Meeting

  • Office Live Meeting

Entourage

  • Entourage 2004

Visual SourceSafe

  • Visual SourceSafe 2005
  • Visual SourceSafe 6.0d

Commerce Server

  • Commerce Server 2007
  • Commerce Server 2002


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Linux Updates

Most Unix-like systems, including GNU/Linux and Mac OS X, use the zoneinfo database, which maps a name like "America/New_York" to a set of time zone and DST transitions appropriate for the named location. Standard library routines access this database so that applications can calculate past and predicted future time stamps even if the time zone offset or DST rules often change. When temporal authorities change the rules, the main zoneinfo database is updated, and these updates can be installed as part of ordinary system maintenance. A process's TZ environment variable specifies the location name.

A few Unix-like systems, notably AIX, support only the TZ values required by POSIX, which specify at most one start and stop rule explicitly in the value.[17] TZ must be changed whenever DST rules change, and the new TZ value applies to all years, mishandling some older time stamps.

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Red Hat Linux

The Red Hat patch can be obtained here.

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Ubuntu Linux

The Ubuntu patch can be obtained here.


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Other Unix-like Systems

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How to build the Unix Zoneinfo Time Zone Files Manually

Unix is flexible enough that even older OS versions can have simple fixes applied. Any system using the Zoneinfo format, (GNU/Linux, Cygwin, FreeBSD, NetBSD, OpenBSD, Mac OS X, HP-UX, IRIX, Solaris, Tru64, UnixWare. OpenVMS) can be updated manually using the 'zic' time zone compiler.

Build binary zone files:

  • Download the latest copy of ftp://elsie.nci.nih.gov/pub/tzdata*.tar.gz. This will include the details of the DST change. You could also update the source files by hand i.e.: /usr/share/lib/zoneinfo/src in solaris
  • View file to ensure necessary changes have been made.
  • Compile the binary zone file per the instructions of the time zone compiler 'zic' which comes with the system.
  • Install the new binary zone file over the current zone file, making sure all symbolic links, etc, are updated as needed.


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Sun Solaris Patches

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SPARC Platform

  • Solaris 8 with patches 109809-02 or later and 108993-52 or later
  • Solaris 9 with patches 113225-03 or later and 112874-33 or later
  • Solaris 10 with patches 122032-01 or later and 119689-07 or later


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x86 Platform

  • Solaris 8 with patches 109810-02 or later and 108994-52 or later
  • Solaris 9 with patches 116545-02 or later and 114432-23 or later
  • Solaris 10 with patches 122033-01 or later and 121208-03 or later

There is also some info on the Posix / libc patches, which can be found here.

Unofficial Solaris 2.51, 2.6 and 2.7 patches can be found here. As with any patch, be sure to test it before you roll it out on yuor production computers.


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HP-UX Patches

  • PHCO_34673 s700_800 11.00 tztab(4) cumulative patch
  • PHCO_34668 s700_800 11.11 tztab(4) cumulative patch
  • PHCO_34669 s700_800 11.23 tztab(4) cumulative patch
  • HP-UX 11i v3 will have the patches in it when it ships.

Quality packs containing the above patches can be downloaded here.


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Mobile Devices

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BlackBerry

Patches will be needed to keep the device's time correct. Download here.

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