Editing Time zone (section)

==== Smalltalk ====
Each [[Smalltalk]] dialect comes with its own built-in classes for dates, times and timestamps, only a few of which implement the DateAndTime and Duration classes as specified by the ANSI Smalltalk Standard. [[VisualWorks]] provides a TimeZone class that supports up to two annually recurring offset transitions, which are assumed to apply to all years (same behavior as Windows time zones). [[Squeak]] provides a Timezone class that does not support any offset transitions. [[Dolphin Smalltalk]] does not support time zones at all.

For full support of the tz database (zoneinfo) in a Smalltalk application (including support for any number of annually recurring offset transitions, and support for different intra-year offset transition rules in different years) the third-party, open-source, ANSI-Smalltalk-compliant Chronos Date/Time Library is available for use with any of the following Smalltalk dialects: VisualWorks, Squeak, Gemstone, or Dolphin.<ref>{{Cite web|url=http://www.chronos-st.org/|archiveurl=https://web.archive.org/web/20140405043602/http://www.chronos-st.org/|url-status=dead|title=chronos-st – Keeping up with time|date=October 21, 2024|archivedate=April 5, 2014}}</ref>