by Kieran O'Shea 3.7 (24 reviews)

Calendar

Name: Calendar
Rating: 3.7 (24 reviews)
Author: Kieran O'Shea

A simple but effective Calendar plugin for WordPress that allows you to manage your events and appointments and display them to the world.

Calendar ranks #3,416 among WordPress.org plugins with 4,000+ active installations, is #84 of 1,892 in the Calendar & Events category, a 3.7/5 rating from 24 reviews, and was last updated May 16, 2026. Data from WordPress.org, refreshed twice daily — see methodology.

Tested up to WP 6.9.7 (Current: 7.1)

v1.3.18 Current Version v1.3.18

Updated 4 months ago Last Update on 16 May, 2026

Refreshed 14 hours ago Last Refreshed on

#84 of 1,892 in Calendar & Events Top 5% by installs Downloads -16.2% this week

View on WordPress.org

Rank

#3,416

+1 this week

Active Installs

4K+

-14.8%

KW Avg Position

47.5

0.2 worse

Downloads

680.4K

+24 today

Support Resolved

— No change

Rating

74%

Review 3.7 out of 5

3.7 (24 reviews)

Next Milestone 5K

Total Progress 67.9%

4K+ 5K+

155

Ranks to Climb

Growth Needed

8,000,000

Active Installs

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Need 321 more installs to reach 5K+

Rank Changes

Current #3,416

Change

Best #

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Active Installs Growth

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Active Installs 0,000,000+

Growth +0.0%

Peak 0,000,000

Downloads Growth

Downloads

Growth

Peak

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Reviews & Ratings

3.7

24 reviews

Overall 74%

12 (50%)

4 (17%)

2 (8%)

1 (4%)

5 (21%)

Security History

Source: WPVulnerability

9 known vulnerabilities on record · 2 in the last 24 months · checked 3 days ago

Jul 6, 2026

Calendar [calendar] < 1.3.18

CVE-2026-14827 · Fixed in v1.3.18
Dec 22, 2025

Calendar [calendar] < 1.3.17

CVE-2025-14548 · Fixed in v1.3.17
Apr 29, 2024

Calendar [calendar] < 1.3.15

CVE-2024-2831 · Fixed in v1.3.15
Nov 13, 2018

Calendar [calendar] < 1.3.11

Fixed in v1.3.11
Oct 30, 2018

Calendar [calendar] < 1.3.11

CVE-2018-18872 · Fixed in v1.3.11
Nov 8, 2016

Calendar [calendar] < 1.3.8

Fixed in v1.3.8
Aug 28, 2016

Calendar [calendar] < 1.3.8

Fixed in v1.3.8
Mar 26, 2013

Calendar [calendar] < 1.3.3

CVE-2013-2698 · Fixed in v1.3.3
Calendar [calendar] < 1.3.8

Fixed in v1.3.8

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Plugin Details

Version: 1.3.18
Last Updated: May 16, 2026
Requires WP: 6.2.4+
Tested Up To: 6.9.7
PHP Version: N/A
Author: Kieran O'Shea

Support & Rating

Rating: ★ ★ ★ ★ ☆ 3.7
Reviews: 24
Support Threads: 0
Resolved: 0%

Keywords

calendar dates events times

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TL;DR

AI summary of the plugin's readme

This plugin is for WordPress site owners who need to manage events and appointments. It solves the problem of organizing and displaying a calendar of events to site visitors.

Monthly view of events
Events can repeat on schedules
Sidebar widget for events
Events organized into categories
Modifiable CSS via options panel
Pop up calendars for date selection
iCalendar feed of events
Compatible with WordPress MU

Frequently Asked Questions

Common questions about Calendar

Support is primarily available on Kieran O'Shea's forum. A wealth of questions and answers are available here along with a copy of this FAQ. The support forum is located away from WordPress because at the time the original plugin was authored, the WordPress support forums didn't provide an easy way to be notified of posts and manage things. Recently things have changed in this regard and so the WordPress support forums for Calendar are also monitored from time to time.

Please use the support forums mentioned above, adding your request to the feature requests thread

Of course. Simply visit Kieran O'Shea's website and use the PayPal donate link in the sidebar on the right hand side I get 404 errors This issue has been fixed in the new version. Please upgrade. I can't add events in the admin panel. I use IE6. This issue has been fixed in the new version. Please upgrade. My .htaccess file keeps getting over-written .htaccess modifications are not required in the new version. Please upgrade.

This is because you need to ensure they are visible in your theme first. To do this under WordPress 2.8 there are a pair of widgets that you can add to your side bar in the admin panel. Position them how you want. Under WordPress 2.0 or where your theme does not support widgets you need to modify the sidebar.php file of your theme to include the following code as appropriate: <?php echo calendar_todays_events(); ?> <?php echo calendar_upcoming_events(); ?>

You need to place the tag {CALENDAR} someplace in the post or page using the editor. This tag will be replaced with an instance of Calendar when the page is viewed.

Unlike the days of version 1.1 you shouldn't find version 1.2 overflows your theme or anything like that, but you might find the font size unsuitable or that the colours aren't appropriate. If this is the case you can use the Calendar options page to modify the CSS. Every element of Calendar has a CSS class, and different types of table cell (with a day, without etc) have their own CSS class also. These are detailed in the default CSS style sheet. I cannot help you to make alterations to these yourself, but any online guide concerning CSS should be able to help you with this. I've added the todays events and upcoming events widgets (or functions in the case of WordPress 2.0) to my sidebar and switched on the features in the config screen but still can't see them in my sidebar. What is going wrong? Are you sure you have added any events or that ones you have added are in the future or today? The todays events widget only shows if there are events today and the upcoming events widget only shows if there are events in the number of future days as specified in the configuration screen. I've allowed a user group other than admin to manage events but now they can see and modify the events created by admin. This is intentional. Many people requested that they wanted users other than admin to be able to manage events and this is what this feature allows. You must of course trust the group of users you grant access to do sensible things. If they are not doing sensible things, you might want to review their ability to access the manage events screen by changing the user group that can do this. I deleted a user but events they had added are still showing but as the admin user. This is normal. It was reasoned during development that because events are usually useful to everyone, the deletion of a user doesn't mean that you necessarily want events they added to be deleted also. Because events now have to be associated with a user, deleting a user who added events causes their events to be allocated to the admin user. If you don't want these events anymore then you have to manually delete them. You might find it easier to do this while the user is still active because you will be able to see their events more clearly on the manage events screen.

Over 80% of support questions had to do with users not being able to setup their .htaccess file correctly to enable pretty links. Because only pretty links were allowed this prevented them from using Calendar. I've taken a step in the opposite direction with the later releases and removed pretty links entirely. This permits a one-click install for users. Those with experience will be able to modify the plugin slightly and add .htaccess rules to re-enable pretty permalinks. Sadly for those that liked the links but don't know how to re-enable them you are out of luck. I don't code this plugin for profit and so I had to think of the time I was spending on support questions rather than features in this particular case. I like pretty links and use them on all my sites, but they are non-trivial to setup and I don't want to be giving lessons every day on what to do rather than getting on with my own work. Sorry.

Yes. Calendar is released under the GPL which permits you to copy, modify and redistribute the plugin as you see fit after you have downloaded it. So long as credit to me, Kieran O'Shea, is maintained within the source then you can remove the link and make any other changes you want. Please be aware however that I will only provide support to users who's calendar (or site footer) is sporting the link to my website.

Calendar conforms to the main WordPress setting as to what day the week starts on. If you go to the settings area of the WordPress admin panel and change what day the week starts on in there, Calendar will change also.

When you install Calendar you will note that there exists one category, entitled "General" into which all new events are placed. If you enable categories you will notice that events suddenly show up highlighted in the same colour that the "General" category is set to and that a key denoting the name of the category and its colour shows up below the calendar. This means that if you create a new category with a different name and colour and place event(s) into it they will show up in the new colour. This allows you to see easily what type of events are scheduled.