This files describes API changes in /calendar/* ,
information provided here is intended especially for developers.

=== 3.3 ===
* calendar_event_hook() has been removed. Developers should be using the Moodle events system to achieve this behaviour,
  rather than using a hacky calendar specific implementation.
* calendar_wday_name() is deprecated and no longer used in core.
* calendar_get_block_upcoming() is deprecated, please use block_calendar_upcoming::get_upcoming_content() instead.
* calendar_print_month_selector() is deprecated and no longer used in core.
* calendar_cron() is deprecated and should not be used. Please use the core\task\calendar_cron_task instead.

=== 3.2 ===
* calendar_preferences_button() is now deprecated. Calendar preferences have been moved to the user preferences page.

=== 2.9 ===
default values changes in code:
* core_calendar_external::get_calendar_events_parameters() 'timeend' default option changed; now, by default,
  all events are returned, not only the past ones.
* calendar types need to be updated to be compatible with standard PHP date/time code

=== 2.5 ===
required changes in code:
* calendar_add_icalendar_event() now requires a valid subscriptionid
* calendar_process_subscription_row() throws exception for invalid subscriptionid
* calendar_update_subscription_events() now throws a dml_exception instead of moodle_exception for bad subscriptions
* calendar_get_mini() function now has optional $placement and $courseid paramaters.

optional - no changes needed:
* calendar_update_subscription() should now be used to update Ical subscriptions.

=== 2.4 ===

required changes in code:

* calendar_get_popup() function now just returns id, instead of the string "id=$id"
