Files formatted according to the specification usually have an extension of. Hay muchas cosas que puede hacer con Google Calendar, si es un experto enThe Internet Calendaring and Scheduling Core Object Specification ( iCalendar) is a media type which allows users to store and exchange calendaring and scheduling information such as events, to-dos, journal entries, and free/busy information. The events are added to the calendar selected in the calendar list.Google Calendar es un producto de Google que ayuda a crear eventos y tareas para la rutina diaria. You can also drag a file with events to Calendar. Choose the calendar to add the events to. Select the file with the events, then click Import.

For example, certain events can be sent by traditional email or whole calendar files can be shared and edited by using a WebDav server, or SyncML. ICalendar is used and supported by many products, including Google Calendar, Apple Calendar (formerly iCal), IBM Notes (formerly Lotus Notes), Yahoo! Calendar, Evolution (software), eM Client, Lightning extension for Mozilla Thunderbird and SeaMonkey, and partially by Microsoft Outlook and Novell GroupWise.ICalendar is designed to be independent of the transport protocol. The file format is specified in a proposed Internet standard (RFC 5545) for calendar data exchange.

ICalendar data files are plain text files with the extension. ICalendar is heavily based on the earlier vCalendar by the Internet Mail Consortium (IMC). Publishers can embed iCalendar data in web pages using hCalendar, a 1:1 microformat representation of iCalendar in semantic (X) HTML.ICalendar was first created in 1998 by the Calendaring and Scheduling Working Group of the Internet Engineering Task Force, chaired by Anik Ganguly of Open Text Corporation, and was authored by Frank Dawson of Lotus Development Corporation and Derik Stenerson of Microsoft Corporation.

Lines should be limited to 75 octets (not characters) long. The equivalent file type codes in Apple Macintosh operating system environments are iCal and iFBf.By default, iCalendar uses the UTF-8 character set a different character set can be specified using the 'charset' MIME parameter (if the transport method used supports MIME, such as Email or HTTP).Each line is terminated by CR+ LF (in hexadecimal: 0D0A). RFC 5545 replaced RFC 2445 in September 2009 and now defines the standard.ICalendar data have the MIME content type text/calendar.The filename extension of ics is to be used for files containing calendaring and scheduling information, ifb for files with free or busy time information consistent with this MIME content type.

Regardless, iCalendar-based code such as GroupDAV and CalDAV are now being used more frequently in both client and server software packages.The IETF 'Calendaring and Scheduling Working Group' (ietf-calsify WG) has published additional proposed revisions to the iCalendar standards (as RFC-drafts/'Proposed'), but as of January 2011, the group has 'ended'. This protocol was eventually abandoned, possibly because of excessive complexity. The memo 'Calendar Access Protocol' ( RFC 4324) was an initial attempt at a universal system to create real-time calendars.

However, multiple iCalendar objects can be grouped together.The first line must be BEGIN:VCALENDAR, and the last line must be END:VCALENDAR the contents between these lines is called the 'icalbody'.The body MUST include the 'PRODID' and 'VERSION' calendar properties. Typically, this information will consist of a single iCalendar object. Technical specifications Core object The top-level element in iCalendar is the Calendaring and Scheduling Core Object, a collection of calendar and scheduling information.

Events (VEVENT) VEVENT describes an event, which has a scheduled amount of time on a calendar. Empty lines are not allowed in some versions of usage (Google calendar).Here is a simple example of an iCalendar object, ' Bastille Day Party' event which occurs J17:00 (UTC) through J03:59:59 (UTC):PRODID:-//hacksw/handcal//NONSGML Day PartyThere are many different types of components which can be used in iCalendar, as described below. For example, the calendar component can specify an event, a to-do list, a journal entry, time zone information, free/busy time information, or an alarm. The calendar components are several calendar properties which create a calendar schematic (design). The calendar properties apply to the entire calendar. VERSION:1.0 was used to specify that data is in the old vCalendar format.The body of the iCalendar object (the icalbody) is made up of a list of calendar properties and one or more calendar components.

In addition, Outlook 2002 and Outlook 2003 demand a UID and a DTSTAMP.VTODO explains a to-do item, i.e., an action-item or assignment.Not all calendar applications recognize VTODO items. The other component property to be set is:In Microsoft Outlook, the SUMMARY corresponds to the 'Subject' entry in the 'Appointment' form, and DESCRIPTION to the descriptive text below it. If the user needs to send in a cancellation for an event, the UID should be the same as the original event, and the component properties should be set to cancel.For sending an UPDATE for an event the UID should match the original UID. If the calendar event is recurring, DTSTART sets up the start of the first event.VEVENT also is used for calendar events without a specific time, such as anniversaries and daily reminders. Such events have a DTSTART which sets a starting time, and a DTEND which sets an ending time. A VEVENT may include a VALARM which allows an alarm.

A 'VJOURNAL' calendar component does not take up time on a calendar, so it has no effect on free or busy time (just like TRANSPARENT entries). They attach descriptive text to a particular calendar date, may be used to record a daily record of activities or accomplishments, or describe progress with a related to-do entry. The SEQUENCE element shows this to-do has been modified twice since it was initially created.PRODID:-//ABC Corporation//NONSGML My Income TaxesVJOURNAL is a journal entry. An audio alarm has been specified to remind the calendar user at noon, the day before the to-do is expected to be completed and repeat hourly, four additional times. The following is an example of a to-do due on April 15, 1998.

Also KOrganizer from the KDE desktop and Evolution from the GNOME desktop support VJOURNAL.

Extensions For Mac Calendar