Calendar is a personal calendar app made by

Apple Inc. Apple Inc. is an American multinational corporation and technology company headquartered in Cupertino, California, in Silicon Valley. It is best known for its consumer electronics, software, and services. Founded in 1976 as Apple Comput ...

for its

macOS macOS, previously OS X and originally Mac OS X, is a Unix, Unix-based operating system developed and marketed by Apple Inc., Apple since 2001. It is the current operating system for Apple's Mac (computer), Mac computers. With ...

iOS Ios, Io or Nio (, ; ; locally Nios, Νιός) is a Greek island in the Cyclades group in the Aegean Sea. Ios is a hilly island with cliffs down to the sea on most sides. It is situated halfway between Naxos and Santorini. It is about long an ...

iPadOS iPadOS is a mobile operating system developed by Apple for its iPad line of tablet computers. It was given a name distinct from iOS, the operating system used by Apple's iPhones to reflect the diverging features of the two product lines, suc ...

watchOS watchOS is the operating system of the Apple Watch, developed by Apple Inc., Apple. It is based on iOS, the operating system used by the iPhone, and has many similar features. It was released on April 24, 2015, along with the Apple Watch, the o ...

and

visionOS visionOS is a mixed reality operating system derived primarily from iPadOS and its core frameworks (including UIKit, SwiftUI, ARKit and RealityKit), and MR-specific frameworks for foveated rendering and real-time interaction. It was develope ...

operating systems An operating system (OS) is system software that manages computer hardware and software resources, and provides common daemon (computing), services for computer programs. Time-sharing operating systems scheduler (computing), schedule tasks for ...

. It offers online cloud backup of calendars using Apple's

iCloud iCloud is the personal cloud service of Apple Inc. Launched on October 12, 2011, iCloud enables users to store and Data synchronization, sync data across devices, including Apple Mail, Calendar (Apple), Apple Calendar, Photos (Apple), Apple Ph ...

service, or can synchronize with other calendar services, including Google Calendar and

Microsoft Exchange Server Microsoft Exchange Server is a mail server and calendaring server developed by Microsoft. It runs exclusively on Windows Server operating systems. The first version was called Exchange Server 4.0, to position it as the successor to the relat ...

. The macOS version was known as iCal before the release of OS X Mountain Lion in July 2012. Originally released as a free download for Mac OS X Jaguar, on September 10, 2002, it was bundled with the operating system as iCal 1.5 with the release of

Mac OS X Panther Mac OS X Panther (version 10.3) is the fourth major release of macOS, Apple's desktop and server operating system. It followed Mac OS X Jaguar and preceded Mac OS X Tiger. It was released on October 24, 2003, with the retail price of US$12 ...

. iCal was the first calendar application for

Mac OS X macOS, previously OS X and originally Mac OS X, is a Unix, Unix-based operating system developed and marketed by Apple Inc., Apple since 2001. It is the current operating system for Apple's Mac (computer), Mac computers. With ...

to offer support for multiple

calendar A calendar is a system of organizing days. This is done by giving names to periods of time, typically days, weeks, months and years. A calendar date, date is the designation of a single and specific day within such a system. A calendar is ...

s and the ability to intermittently publish/subscribe to calendars on

WebDAV WebDAV (Web Distributed Authoring and Versioning) is a set of extensions to the Hypertext Transfer Protocol (HTTP), which allows user agents to collaboratively author contents ''directly'' in an HTTP web server by providing facilities for conc ...

servers. Version 2 of iCal was released as part of

Mac OS X Tiger Mac OS X Tiger (version 10.4) is the 5th major release of macOS, Apple's desktop and server operating system for Mac computers. Tiger was released to the public on April 29, 2005, for US$129.95 as the successor to Mac OS X 10.3 Panther. Inc ...

, Version 3 as part of

Mac OS X Leopard Mac OS X Leopard (version 10.5) is the sixth software versioning, major release of macOS, Apple Inc., Apple's desktop and server operating system for Macintosh computers. Leopard was released on October 26, 2007, as the successor of Mac OS X Ti ...

, Version 4 as part of

Mac OS X Snow Leopard Mac OS X Snow Leopard (version 10.6) (also referred to as OS X Snow Leopard) is the seventh major release of macOS, Apple's desktop and server operating system for Macintosh computers. Snow Leopard was publicly unveiled on June 8, 2009, at A ...

, Version 5 as part of Mac OS X Lion, Version 6 as part of OS X Mountain Lion, Version 7 as part of

OS X Mavericks OS X Mavericks (version 10.9) is the 10th major release of macOS, Apple Inc.'s desktop and server operating system for Macintosh computers. OS X Mavericks was announced on June 10, 2013, at WWDC 2013, and was released on October 22, 2013, wo ...

, Version 8 as part of

OS X Yosemite OS X Yosemite ( ; version 10.10) is the eleventh major release of macOS, Apple Inc.'s desktop and server operating system for Macintosh computers. OS X Yosemite was announced and released to developers on June 2, 2014, at WWDC 2014 and re ...

and

OS X El Capitan OS X El Capitan ( ) () is the twelfth major release of macOS (named OS X at the time of El Capitan's release), Apple Inc.'s desktop and server operating system for Macintosh. It focuses mainly on performance, stability, and security. Followi ...

, and version 9 as part of macOS Sierra. Apple licensed the iCal name from Brown Bear Software, who have used it for their iCal application since 1997. iCal's initial development was quite different from other Apple software: it was designed independently by a small French team working "secretly" in

Paris Paris () is the Capital city, capital and List of communes in France with over 20,000 inhabitants, largest city of France. With an estimated population of 2,048,472 residents in January 2025 in an area of more than , Paris is the List of ci ...

, led by Jean-Marie Hullot, a friend of

Steve Jobs Steven Paul Jobs (February 24, 1955 – October 5, 2011) was an American businessman, inventor, and investor best known for co-founding the technology company Apple Inc. Jobs was also the founder of NeXT and chairman and majority shareholder o ...

. iCal's development has since been transferred to Apple US headquarters in Cupertino.

Features

Calendar tracks events and appointments, allows multiple calendar views (such as calendars for "home", "work", and other calendars that a user can create) to quickly identify conflicts and free time. Users can subscribe to other calendars so they can keep up with friends and colleagues, and other things such as athletic schedules and television programs, as well as set notifications for upcoming events either in the Notification Center, by

email Electronic mail (usually shortened to email; alternatively hyphenated e-mail) is a method of transmitting and receiving Digital media, digital messages using electronics, electronic devices over a computer network. It was conceived in the ...

, SMS, or

pager A pager, also known as a beeper or bleeper, is a Wireless communication, wireless telecommunications device that receives and displays Alphanumericals, alphanumeric or voice messages. One-way pagers can only receive messages, while response p ...

. Attachments and notes can be added to iCloud Calendar items. It is integrated with

, so calendars can be shared and synced with other devices, such as other Macs, iPhones, iPads, iPod touch, and PCs over the

internet The Internet (or internet) is the Global network, global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to communicate between networks and devices. It is a internetworking, network of networks ...

. One can also share calendars via the

protocol. Google now supports

for Google Calendar making Calendar easily configurable. Calendar includes the ability to see travel time and weather at the event's location, with the ability to set an alarm based on the travel time. Different time zones can be selected when entering and editing start and end times. This allows long-distance airplane flight times, for example, to be entered accurately and for that "end" of a visualized time "box" to render accurately on either

when time zone support is turned on in Calendar and the time zone set in Date/Time to the location in question. Calendar support was added to CarPlay with

iOS 13 iOS 13 is the thirteenth major release of the iOS mobile operating system developed by Apple for the iPhone, iPod Touch and HomePod. The successor to iOS 12, it was announced at the company's Worldwide Developers Conference (WWDC) on June ...

, allowing Siri to display and read out a user's upcoming events while driving. The app icon shows the device's current date when viewed from the home screen, making it one of the only iOS apps with a dynamic icon (the other being

Clock A clock or chronometer is a device that measures and displays time. The clock is one of the oldest Invention, human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month, a ...

). On the WWDC 2023 Apple introduced the

Apple Vision Pro The Apple Vision Pro is a mixed reality, mixed-reality headset developed by Apple Inc., Apple. It was announced on June 5, 2023, at Apple's Worldwide Developers Conference (WWDC) and was released first in the US, then in global territories thr ...

and the operating system visionOS with the Apple Calendar.

References

External links

New Software Lets Users Manage Multiple Calendars & Share Calendars Over The Internet
- Apple's July 2002 press release introducing iCal

- Apple's September 2002 press release announcing availability of iCal
Calendar and Scheduling Consortium
part of next version of iCal Server (Leopard)
iCal4j
- iCal Java library (with usage examples)
Perl script
an
instructions
to subscribe from iCal to a Sun Calendar Server and subsequently sync it to mobile devices through iSync
Apple iCal Calendars

Geody iCal and csv calendars
- Free (CC-by-sa) calendars
iCalShare
- Free calendars {{DEFAULTSORT:iCal Calendaring software MacOS-only software made by Apple Inc. IOS software

Calendar A calendar is a system of organizing days. This is done by giving names to periods of time, typically days, weeks, months and years. A calendar date, date is the designation of a single and specific day within such a system. A calendar is ...

WatchOS software

Features

See also

References

External links