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Calendar · Version history

Calendar changelog and version history

Latest version
1.3.18
May 16, 2026 (5 months ago)
Releases
27
since 2008
In the last year
2
about one every 154 days
Tested up to
WordPress 6.9.11

Releases each year

  • 20086 releases
  • 20091 release
  • 20101 release
  • 20112 releases
  • 20121 release
  • 20131 release
  • 20154 releases
  • 20162 releases
  • 20182 releases
  • 20193 releases
  • 20242 releases
  • 20251 release
  • 20261 release

20261 release

  1. Calendar 1.3.18Latest

    • Fixed XSS issue with event link

20251 release

  1. Calendar 1.3.17

    • Fixed CVE-2025-14548
    • Checked compatibility with WordPress 6.9
    • Corrected missing domain on some i18n calls
    • Updated POT file for translations
    • Achieved green check on latest Plugin Check version (1.7)
    • Hook add_calendar_entry renamed to calendar_add_entry for compatibility with other plugins
    • Filter modify_drawn_event_content renamed to calendar modify_drawn_event_content to avoid clashes with other plugins
    • Filter modify_calendar_link renamed to calendar_modify_link to avoid clashes with other plugins

20242 releases

  1. Calendar 1.3.16

    • Fixed error on event save for some users; Attempt to assign property “event_title” on null
    • Fixed DB error when attempting to display a calendar with a limited number of categories
    • Ensured the version of calendar is correctly updated in the DB upon upgrade
    • Checked compatibility with WordPress 6.6

  2. Calendar 1.3.15

    • Fixed CVE-2024-2831
    • Refactored DB calls to increase code re-use, improve auditability and harden security
    • Comprehensive review and refactor of all variable reads, writes and sanitising
    • Brought code and comments up to latest WordPress standards resulting in clean sheet on “Plugin Check”
    • Upgraded widgets to OOP, now supporting WYSIWYG operation in editor
    • Adjustments to storage approach and widget upgrades may require editing of some events/widgets to correct formatting

20193 releases

  1. Calendar 1.3.14

    • Correcting CSS that was inadvertently overriding wider site elements
    • Removed use of date_i18n – this changed in WordPress 5.3 and now causes undesired operation on upcoming events
    • Enhanced use of CSS colours; added backgrounds on mini calendar, add option to improve category foreground contrast
    • Adding span wrappers around * and “all day” elements with CSS classes to permit removal if so desired
    • Validated performance and compatibility with latest version of WordPress

  2. Calendar 1.3.13

    • Fixed loading order issue with internationalisation
    • Enabled the full 30 characters in the title, even for unicode
    • Fix ability to add basic HTML (line breaks etc.) into event descriptions
    • Validated performance and compatibility with latest version of WordPress

  3. Calendar 1.3.12

    • Removed ability to access PHP files directly
    • Change import of admin CSS and JS to enqueue
    • Removed an erroneous direct reference to the wp-content directory
    • Enhance sanitisation of some admin side user input
    • Ensure all functions are prefixed with plugin name to avoid clashes with other plugins
    • Fixed some bugs with short codes and updated the documentation surrounding these and changed function names

20182 releases

  1. Calendar 1.3.11

    • Fixed reported XSS issues with category name and event title

  2. Calendar 1.3.10

    • Validated performance and compatibility with latest version of WordPress
    • Fixed bug with mouse hover box which caused longer titles to wrap in an unpleasant fashion
    • Corrected incorrect formatting of DTSTAMP field in iCalendar feed
    • Added a filter entitled “modify_drawn_event_content” which allows custom drawing of events on full calendar (requested by user Eric3D)
    • Tackled, after a fashion, the issue of repeating UIDs in iCalendar feed. May now result in IDs changing on a daily basis for some recurring events but should validate
    • Added time zone support into the iCalendar feed

20162 releases

  1. Calendar 1.3.9

    • Improved the feed of events to use iCalendar format

  2. Calendar 1.3.8

    • Fixed a reported XSS issue with the date switcher
    • Added a RSS feed of events

20154 releases

  1. Calendar 1.3.7

    • Added a further fix for dollar signs in event titles and descriptions
    • Reverted potential IIS related fixes as these did not fix anything for IIS users and caused problems for others

  2. Calendar 1.3.6

    • Fixed bug with all categories showing in the category key, even when the calendar above is filtered on a subset of available categories
    • Fix internationalisation string for “all day”
    • Fix day of the week background CSS, moved from inline to part of the CSS style editor box
    • Correct queries to update tables to UTF8 that were failing in certain environments
    • Add calendar version number to a wordpress option to permit a reduced number of queries to be executed
    • Fix performance issue of information schema query, removed this in favour of a one-off hit and hope
    • Fix IIS URL variables not working (probably as no ISS server to test with)
    • Fix translation paths, preventing direct references to wp-content which is deprecated
    • Fix translation header in php file, allowing new plugin translate portal to pick up calendar
    • Add all translations available to the deployment package, enables ease of use and head start for translators

  3. Calendar 1.3.5

    • Fixed bug with date switcher not showing the current month when said month happened to be September
    • Corrected error thrown when numerical date in URL arguments was being incorrectly cast to string
    • Fixed lack of header on POT file and updated the same to include some missing translation strings
    • Improved README file with full FAQ and proper spacing between list items
    • Included assets which support the new WordPress repository GUI, namely a background and an icon
    • Fixed issue whereby accented characters couldn’t be used in titles and descriptions
    • Added action hooks for add, edit and delete events and a filter for event links (requested by user lexhair)

  4. Calendar 1.3.4

    • Enabled short codes for displaying the calendar in posts/pages
    • Enabled use of calendar short codes in the text widgets to permit multiple calendar widget instances via short codes
    • Fixed dollar sign not displaying properly in event descriptions
    • Removed references to deprecated MySQL functions, switching instead to wpdb prepare functions

20131 release

  1. Calendar 1.3.3

    • Fixed XSS security issue (thanks to Charlie Eriksen via Secunia SVCRP for the report)

20121 release

  1. Calendar 1.3.2

    • Ensured manage calendar JavaScript only loads on manage calendar page in admin panel
    • Switched to GPL compatible JavaScript date picker

20112 releases

  1. Calendar 1.3.1

  2. Calendar 1.3

20101 release

  1. Calendar 1.2.3

20091 release

  1. Calendar 1.2.2

20086 releases

  1. Calendar 1.2.1

  2. Calendar 1.2

  3. Calendar 1.1.2

  4. Calendar 1.1.1

  5. Calendar 1.1

  6. Calendar 1.0

Questions about Calendar’s releases

What is the latest version of Calendar?

1.3.18, released on May 16, 2026 (5 months ago). It’s tested up to WordPress 6.9.11.

How often is Calendar updated?

2 releases in the last year, about one every 154 days. Its first release on WordPress.org dates from September 2008.

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Release dates come from the day each version’s folder was made in Calendar’s WordPress.org SVN repository; the notes from its readme’s changelog, as its authors wrote it.