User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:18.104.22.168) Gecko/20061206 Firefox/22.214.171.124 Build Identifier: Sunbird 0.3 Since the US changes to a new Daylight Savings Time regimen in 2007, the US Holiday file for Sunbird needs to be updated to "the second Sunday in March and the first Sunday in November." Reproducible: Always Steps to Reproduce: 1.Install Sunbird 2.Install US Holiday file from http://www.mozilla.org/projects/calendar/holidays.html 3.Compare March and April, October and November. Actual Results: Shows old Daylight Savings Time dates. Expected Results: Show new Daylight Savings Time dates. This should be a simple fix for the person responsible for the Holiday files.