DateTime Project Modules

So far, the DateTime project includes the following modules:

Base Modules

• DateTime.pm (Dave Rolsky and others) - a base datetime object representing the Gregorian calendar. Also includes DateTime::Duration and DateTime::Infinite.
• DateTime::Locale (Richard Evans and Dave Rolsky) - modules for handling localization. Designed to work in conjunction with DateTime.pm.
• DateTime::TimeZone (Dave Rolsky) - modules for handling time zones. Designed to work in conjunction with DateTime.pm.
• DateTime::Set (Flavio Glock and Dave Rolsky) - a class for representing sets of datetime objects. Also includes DateTime::Span and DateTime::SpanSet.
• DateTime::Incomplete (Flavio Glock) - a class for representing incomplete datetime objects, where not all of the elements of the datetime are known.

Formatting and Parsing Modules

• DateTime::Format::Baby (Rick Measham, adapted from code by Abigail) - formats datetimes for babies.
• DateTime::Format::Bork (Joshua Hoblitt) - formats datetimes for that guy from The Muppet Show.
• DateTime::Format::Builder (Iain Truskett) - support code for creating DateTime::Format modules or one-off parser objects.
• DateTime::Format::CLDR (Maroš Kollár) - parse and format CLDR time patterns
• DateTime::Format::DateManip (Ben Bennett) - translates Date::Manip parseable strings to and from DateTime and DateTime::Duration objects.
• DateTime::Format::DateParse (Joshua Hoblitt) - translates Date::Parse parseable strings into DateTime objects.
• DateTime::Format::DBI (Claus Färber) - given a DBI handle, picks the appropriate formatting module for the handle.
• DateTime::Format::Duration (Rick Measham) - format and parse durations with strftime/strptime style patterns.
• DateTime::Format::Epoch (Eugene van der Pijll) - translates DateTime objects to and from "seconds since the epoch", much more comprehensively than DateTime.pm itself does.
• DateTime::Format::Excel (Iain Truskett) - parses and formats Excel dates.
• DateTime::Format::HTTP (Iain Truskett) - parses and formats dates uses the HTTP::Date module, which can parse a number of common datetime formats.
• DateTime::Format::IBeat (Iain Truskett) - parses and formats ".beat" times.
• DateTime::Format::ICal (Dave Rolsky) - parses and formats the iCal datetime and duration formats.
• DateTime::Format::ISO8601 (Joshua Hoblitt) - parses datetimes in various ISO8601 formats.
• DateTime::Format::Japanese (Daisuke Maki) - parses and formats datetime in Japanese.
• DateTime::Format::Mail (Iain Truskett) - parses and formats RFC 2822 and RFC 822 (the email RFCs) style times.
• DateTime::Format::MySQL (Dave Rolsky) - parses and formats dates in the formats output by MySQL.
• DateTime::Format::Natural (Steven Schubiger) - parses natural language dates, much like Date::Manip.
• DateTime::Format::Pg (Claus Färber) - parses and formats dates, times, and intervals in the formats output by Postgres.
• DateTime::Format::Roman (Eugene van der Pijll) - formats dates using the Roman style. What have the Romans ever done for us?
• DateTime::Format::Strptime (Rick Measham) - implements strptime() for the DateTime project.
• DateTime::Format::W3CDTF (Kellan Elliot-McCrea) - parses and formats the W3CDTG datetime strings.
• DateTime::Format::WindowsFileTime (Jim Garvin) - parses and formats the "Windows File Time" hex strings.

Calendar Modules

• DateTime::Calendar::Chinese (Daisuke Maki) - the Chinese calendar.
• DateTime::Calendar::Christian (Eugene van der Pijll) - the combined Julian/Gregorian calendar. The reform date is user-settable, so it is capable of representing the historical Western calendar for any location.
• DateTime::Calendar::Coptic (Daniel Yacob) - the Coptic calendar. Also includes DateTime::Calendar::CopticEthiopic.
• DateTime::Calendar::Discordian (Jaldhar H. Vyas) - the Discordian calendar.
• DateTime::Calendar::FrenchRevolutionary (Jean Forget) - the French Revolutionary calendar.
• DateTime::Calendar::Hebrew (Steven Weinberger) - the Hebrew calendar.
• DateTime::Calendar::Hijri (Eugene van der Pijll) - a thin wrapper around Date::Hijri. Discussion on the datetime list suggests that this module is not very accurate. Future versions may a different algorithm.
• DateTime::Calendar::Japanese (Daisuke Maki) - the Japanese calendar.
• DateTime::Calendar::Julian (Eugene van der Pijll) - the Julian calendar.
• DateTime::Calendar::Mayan (Joshua Hoblitt) - the Mayan Long Count calendar.
• DateTime::Calendar::Pataphysical (Eugene van der Pijll) - the Pataphysical calendar, an artificial calendar that has 13 months of 29 days each.
• DateTime::Fiction::JRRTolkien::Shire (Tom Braun) - the calendar used by those nasty hobbitses.

Event Modules

• DateTime::Event::Chinese (Daisuke Maki) - calculates events in the Chinese calendar.
• DateTime::Event::Cron (Matt Sisk) - generates recurrences from cron lines/files.
• DateTime::Event::Easter (Rick Measham) - calculates Easter events (Easter Sunday, Palm Thursday, etc.) for both Western churches and the Eastern Orthodox church.
• DateTime::Event::ICal (Flavio Glock) - create recurrences in the same way as iCal.
• DateTime::Event::Lunar (Daisuke Maki) - calculates lunar events.
• DateTime::Event::NameDay (Ben Bennett) - get day names by date or name for various countries.
• DateTime::Event::Random (Flavio Glock) - create sets of random datetimes.
• DateTime::Event::Recurrence (Flavio Glock) - a convenient interface for generating sets to represent various types of recurrences, such as monthly, daily, etc.
• DateTime::Event::SolarTerm (Daisuke Maki) - calculates solar term events.
• DateTime::Event::Sunrise (Ron Hill) - calculates sunrise and sunset for places around the world.
• DateTime::Event::Zodiac (Maros Kollar) - calculates (astronomically correct) zodiac signs

Business/Fiscal

• DateTime::Fiscal::Retail454 (Jim Bacon) - Provides methods to implement and manipulate 4-5-4 calendars and events.
• DateTime::Fiscal::Year (Jesse Shy) - provides calculations for things like "quarter of the fiscal year".

Other Modules

• DateTime::Functions (Autrijus Tang) - a procedural interface for DateTime constructors.
• DateTime::HiRes (Joshua Hoblitt) - provides a single method, DateTime::HiRes->now(), that uses Time::HiRes::time() to get the current epoch value as a floating point number.
• DateTime::LazyInit (Rich Measham) - an object with a very quick constructor that provides a small part of the DateTime.pm API, inflating into a real DateTime.pm object as needed .
• DateTime::TimeZone::Alias (Joshua Hoblitt) - allows you to create and remove arbitrary aliases to time zones. This functionality may be integrated into DateTime::TimeZone in the future.
• DateTime::TimeZone::LMT (Rick Measham) - a time zone class for local mean time offsets.
• DateTime::TimeZone::TAI (Eugene van der Pjill) - implements support for TAI as a timezone.
• DateTime::Util::Astro (Daisuke Maki) - provides functions for calculating various astronomical events that are needed for some calendars.
• DateTime::Util::Calc (Daisuke Maki) - a utility module for calculations that are needed for some calendars.
• Time::Local (Dave Rolsky) - not a DateTime module, but it is maintained in the DateTime CVS repository since DateTime.pm needs it.

Friendly Modules

Modules that are not officially part of the DateTime suite but which play nice with it in some way.

• Class::DBI::Plugin::DateTime
• Data::FormValidator::Constraints::DateTime
• Data::iCal::DateTime
• Rose::DateTime
• Sort::Key::DateTime
• SPOPSx::Tool::DateTime
• Template::Plugin::DateTime (Daisuke Maki) - a Template Toolkit plugin for DateTime.pm objects.
• Time::Format

Confusing Modules

There are a few modules that start with "DateTime::" that are not trying to be part of the DateTime suite:

• DateTime::BusinessHours
• DateTime::Cron::Simple
• DateTime::Current - since renamed to DateStamp
• DateTime::Easy - a lot like DateTime::Format::Natural, but uses Date::Parse under the hood, since renamed to DateTimeX::Easy
• DateTime::Precise - predates the Perl DateTime project - GPS weeks, seconds and days and subsecond precision
• DateTime::Format::Flexible - largely a subset of DateTime::Format::Natural, and not recommended. Use DateTime::Format::Natural instead (and submit patches to improve its parsing if needed ;)

And more

There are a lot of other date and time modules for Perl. Please see Dave Rolsky's perl.com article, The Many Dates and Times of Perl, for a fairly comprehensive list.