Document Revision History

This table describes the changes to Date and Time Programming Guide.

Date	Notes
2013-04-23	Clarified week and year calendar date component usage.
2011-06-06	Expanded Calendrical Calculations section. Added Historical Dates Section and Week-Based Year Section.
2010-02-24	Corrected code snippet.
2009-07-21	Added links to Cocoa Core Competencies.
2008-07-03	Moved information about NSCalendarDate to an appendix, rewrote articles to replace references to NSCalendarDate, and expanded content.
	Added a section about how to get date components using NSCalendar and NSDateComponents and a section about how to convert from one calendar to another.
	Removed information about converting a date to a string. See NSDateFormatter Class Reference for that information.
2007-09-04	Enhanced discussion of calendrical calculations using NSDateComponents.
2007-03-06	Added note regarding Julian and Gregorian calendars.
2006-05-23	Corrected typographical errors. Added a note about the use of width specifiers for calendar date format strings.
2006-02-07	Updated to include NSCalendar and NSDateFormatter changes introduced in OS X v10.4.
2005-08-11	Changed title from "Dates and Times." Corrected minor typographic error.
2002-11-12	Revision history was added to existing document. It will be used to record changes to the content of the document.