Help:Recurring events

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Recurring events
Silently set recurring semantic data in a wiki page
Further Information
Provided by: Semantic MediaWiki
Minimum version: 1.5.0
Maximum version: still supported
Function: yes
Tag: no
Name: #set_recurring_event
Table of Contents

A recurring event is any event that occurs more than once, according to a pre-defined rule: examples are weekly meetings, anniversaries and birthdays as well as events that span across multiple days or other units of time, such as SMWCon.

In Semantic MediaWiki, the dates for a recurring event are defined using the #set_recurring_event parser function, which is placed on the page that represents the event. All property-value pairs that are created using this function are assigned to a special subobject. This means that the functionality described for subobjects applies to this special form of subobject too. This function additionally takes the following arguments, in any order:

(after :) Name of the property linking the subobject to the current page, e.g. "Event", "Birthday", etc. See the examples below. It is placed directly after the colon of the parser function.
property the datatype "Date"Holds particular points in time that is being set to all the values
start the first date of the series (can include time)
end the last date of the series (optional, can include time)
unit the time unit for the event's frequency; options are 'year', 'month', 'week' and 'day' (optional - default is 'day')
period the number of time units between one occurrence and the next (optional - default is 1)
limit the number of recurring events that will be created. Note that this parameter will be ignored if the end parameter is defined (default is 100 according to configuration parameter $smwgDefaultNumRecurringEventsSets the default number of recurring events if no end date is set)
week number if the unit is set to 'month', this parameter indicates that the event happens on a certain numbered day of the week in each month, like the 1st Thursday of every month. A negative value (anything from -1 to -4) indicates that the event happens on the nth last such day of the month, such as the 2nd-to-last Monday. The actual day of the week is defined by the start date.
include any additional dates to include in the series, separated by semicolons (;) (optional)
exclude any dates to exclude from the series, separated by semicolons (optional)
- Custom property-value pairs may be added as in any subobject.

If no end date is set, a fixed number of dates is simply saved; this number is defined by configuration parameter $smwgDefaultNumRecurringEventsSets the default number of recurring events if no end date is set, which has a default value of 100. There is also a maximum number of dates that can be saved using this function, regardless of the start and end date specified. This number is set by configuration parameter $smwgMaxNumRecurringEventsSets the maximum number of recurring events that can be defined regardless of a given end date, which has a default value of 500. Both values can be modified in one's "LocalSettings.php file".


The following call would create subobjects with an Event property linking to the current page, and set the Has date property for each subobject to Mondays at 7:00 pm between January 4, 2010 and June 8, 2011, with the exception of March 15, 2010 and March 22, 2010, both of which are replaced by the following Tuesday at different times:

{{#set_recurring_event: Event
 |property=Has date
 |start=January 4, 2010 7:00 pm
 |end=June 8, 2011
 |include=March 16, 2010 6:00 pm;March 23, 2010 5:00 pm
 |exclude=March 15, 2010 7:00 pm;March 22, 2010 7:00 pm

The following call creates subobjects with a Birthday property linking to the current page, and a Has birthday property for all birthdays of a person, starting with his or her date of birth; it is done by picking up the date entered on a page for the defined "Property:Has date of birth":

{{#set_recurring_event: Birthday
 |property=Has birthday
 |start={{#show:{{PAGENAME}}|?Has date of birth}}

If such a call were placed in a template, and the date of birth were entered as a template field, the code could be made even simpler:

{{#set_recurring_event: Birthday
 |property=Has birthday
 |start={{{Date of birth|}}}

Note about using dates with times[edit]

#set_recurring_event will set a date only if no times are specified. You can however specify times in the recurring event as well. Two important items to note:

  • Exclude parameters must also specify the time. When #set_recurring_event evaluates it will compare the excluded times array to the calculated recurrences, and is specific to the time. If you specify a start value with a time of 7:00 pm, the exclude must also reference this. If you are working with forms it is convenient to request the time in a separate field and then automatically add it to the start as well as exclude parameters for the user. You may also consider adding it to the include parameters.
  • The end parameter will also honor a time value, and the recurrences will end at that time, instead of at midnight of the date specified.

Live examples[edit]

See also[edit]

This documentation page applies to all SMW versions from 1.5.0 to the most current version.
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