Simple Google Calendar Outlook Events Block Widget


Simple block or widget to display events from a public google calendar, microsoft office outlook calendar or an other iCal file, in the style of your website.

The Gutenberg block requires at least WordPress 5.9.
This simple block/widget fetches events from a public google calendar (or other calendar in iCal format) and displays them in simple list allowing you to fully adapt to your website by applying all kinds of CSS.
Google offers some HTML snippets to embed your public Google Calendar into your website.
These are great, but as soon as you want to make a few adjustments to the styling, that goes beyond changing some colors, they’re not enough.

Plugin Features

  • Calendar block or widget to display appointments/events of a public Google calendar or other iCal file.
  • Block gives live preview in the editor and is not constrained to widget area. Old widget will be displayed in legacy widget block only in widget area.
  • Small footprint, uses only Google ID of the calendar, or ICS link for Outlook, or Url of iCal file, to get event information via iCal
  • Merge more calendars into one block
  • Manage events in Google Calendar, or other iCalendar source.
  • Fully adaptable to your website with CSS. Output in unordered list with Bootstrap 4 listgroup classes and toggle for details.
  • Choose date / time format in settings screen that best suits your website.
  • Displays per event DTSTART, DTEND, SUMMARY, LOCATION and DESCRIPTION. DTSTART is required other components are optional.
  • Displays most common repeating events. Frequency Yearly, Monthly, Weekly, Dayly (not Hourly, Minutely and smaller periods)
  • In the screenshot below: Left the block with default settings and clicked on one summary. Right with some adjusted settings.
    Adjusted settings for start with summary:
    Lay-out: Start with summary.
    Date format first line: “.<\b\r>l jS \o\f F”
    Enddate format first line: ” – l jS \o\f F”
    Time format time summary line: ” G:i”
    Time format end time summary line: ” – G:i”
    Time format start time: “”
    Time format end time: “”
    Tag for summary: “strong”


  • Gets calendar events via iCal url or google calendar ID
  • Merge more calendars into one block
  • Displays maximum the selected number of events as listgroup-items
  • Displays only events in a selected period with a length of the setting “Number of days after today with events” from now limited by the time of the day or the beginning of the day at the start and the and of the at the end.
  • Displays events in timezone of WordPress setting, or in Clients timezone with javascript REST call fetched from the clients browser.
  • Displays event start-date and summary; toggle details, description, start-, end-time, location.
  • Displays most common repeating events
  • Frequency Yearly, Monthly, Weekly, Dayly (not parsed Hourly, Minutely …), INTERVAL (default 1), WKST (default MO)
  • End of repeating by COUNT or UNTIL
  • By day month, monthday or setpos (BYDAY, BYMONTH, BYMONTHDAY, BYSETPOS) no other by…
  • Exclude events on EXDATE from recurrence set (after evaluating BYSETPOS)
  • Respects Timezone and Day Light Saving time. Build and tested with Iana timezones as used in php, Google, and Apple now also tested with Microsoft timezones and unknown timezones. For unknown timezone-names using the default timezone of WordPress (probably the local timezone).

(This widget is a Fork of version 0.7 of that simple google calendar widget by NBoehr

Copyright and License

This project is licensed under the GNU GPL, version 2 or later.
2017 – 2023 © Bram Waasdorp.


  • With theme Twenty Twenty-Two.
  • With theme WP Bootstrap Starter (with bootstrap 4 css and js).
  • Transform from Legacy widget block to Simple ical Block.


This plugin provides 1 block.

  • Simple ical Block Block that displays events from a public calendar or iCal file.


  • Do the usual just install it through the wordpress plugin directory.
    Or download the zip-file and upload it via Plugins Add new … install and activate.
    Or do the old manual setup procedure… you know… downloading… unpacking… uploading… activating.
  • For WP 5.9 and higher: As soon as you activated the plugin, you should see a new block ‘Simple ical Block’ in the (block) Editor in the category Widgets.
    You can enter the block in a post or a page with the block-editor (eg. (+ sign)Toggle block inserter / WIDGETS).
    If your theme has a widget area you can also enter the block as a widget in a widget area:
    Appearance / Widgets / (+ sign)Toggle block inserter / WIDGETS. Just drag it into your sidebar.
  • Alternative : Select ‘Simple Google Calendar Outlook Events Widget’ or select the Legacy widget and choose ‘Simple Google Calendar Outlook Events Widget’
    and drag it into the sidebar.
  • Fill out all the necessary configuration fields.
    In Calendar ID enter the calendar ID displayed by Google Calendar, or complete url of a Google calendar or other iCal file.
    You can find Google calendar ID by going to Calendar Settings / Calendars, clicking on the appropriate calendar, scrolling all the way down to find the Calendar ID at the bottom under the Integrate Calendar section. There’s your calendar id.
  • You’re done!


How to use Google Calendar?

First you have to share your calendar to make it public available, or to create a public calendar. Private calendars cannot be accessed by this plugin.
Then use the public iCal address or the Google calendar ID.
More details on Google support

Where do I find the Google Calendar Id?

You can find Google calendar ID by going to Calendar Settings / Calendars, clicking on the appropriate calendar, scrolling all the way down to find the Calendar ID at the bottom under the Integrate Calendar section. There’s your calendar id.
More details on Google support

How to merge more calendars into one module/block

Fill a comma separated list of ID’s in the Calendar ID field.
Optional you can add a html-class separated by a semicolon to some or all ID’s to distinguish the descent in the lay-out of the event.
E.g.: #example;blue,;red
Events of #example will be merged with events of NL holidays; html-class “blue” is added to all events of #example, html-class “red” to all events of NL holidays.

Can I use HTML in the description of the appointement?

You can use HTML in the most Calendars, but the result in the plugin may not be what you expect.
First: The original iCalendar standard allowed only plain text as part of an event description. Thus probably most calendars will only give the plain text in the Description in the iCal output.
Secondly: For security reasons this plugin filters the HTML to convert characters that have special significance in HTML to the corresponding HTML-entities.

But if you trust the output of the calendar application you can set a checkbox to allow safe html in the output. So if you manage to get the HTML in the Description and you set the checkbox to allow safe html you can get that html in the output, with exception of the tags that are not considered safe like SCRIPT and unknown tags.
And with the current version of Google Calendar you can put some HTML in the Description output. (April 2022) I saw the <a> (link), <b> (bold text), <i> (italic text), <u> (underlined text) and <br> (linebreak) tags in a iCal description. They will all come through with “Allow safe html” checkbox on. Probably even more is possible, but Google can also decide to comply more to the standard.
With Microsoft Outlook the HTML tags were filtered away and did not reach the iCal description

In case you have all kinds of HTML in your appointments a plugin that uses the API of te calendar-application might be a better choice for you.

How to use Microsoft Office Outlook Calendar?

First you have to share your calendar to make it public available, or to create and share a public calendar. Private calendars cannot be accessed by this plugin.
Then publish it as an ICS link and use this link address. (something like…/cid-…/calendar.ics) (works from version 1.3.1 of this widget)
More details on Microsoft Office support

I only see the widget not the block

Are you using at least WP 5.9? Below 5.9 the block doesn’t work.
Are you using a page builder like Elementor? The block might not show in the page builder editor, try if it is available in the WordPress editor.
To support users wo cannot use the Gutenberg block I have in v2.1.1 (with pain in my hart because Gutenberg blocks are in my opinion the future of WP) synchronized the output of the widget again with that of the block.
Otherwise they needed to use a work-around with an extra plugin like described in How to Display Gutenberg Blocks in Other Page Builders (Elementor, Divi, etc) or use an other plugin that adds a shortcode to a Gutenberg block or maybe some pro functionality of Elementor.

How to use Apple Calendar (iCloud Mac/ios)?

Choose the calendar you want to share. On the line of that calendar click on the radio symbol (a dot with three quart circles) right in that line. In the pop up Calendar Sharing check the box Public Calendar. You see the url below something like webcal:// Click on Copy Link and OK. Paste that in the “Calendar ID, or iCal URL” field of the widget (before version 1.3.1 you have to change webcal in https)
More details on the MacObserver

Error: cURL error 28: Operation timed out after 5000 milliseconds with 0 bytes received

Probably the calendar is not public (yet), you can copy the link before the agenda is actually published. Check if the agenda has already been published and try again.

I only see the headline of the calendar, but no events

There are no events found within the selection. Test e.g. with an appointment for the next day and refresh the cache or wait till the cache is refreshed.
Check if you can download the ics file you have designated in the widget with a browser. At least if it is a text file with the first line “BEGIN:VCALENDAR” and further lines “BEGIN:VEVENT” and lines “END:VEVENT”. If you cannot resolve it, you can of course report an error / question in our
community support forum

I only see the title of the calendar, and the text ‘Processing’ even after waiting more the a minute, or a message &#61 Code: undefined = Msg: HTTP error, status = 500

Probably you have chosen the setting “Use Client timezone settings, with REST” in “Use client timezone settings”. With this setting active, at first the widget will be presented as a placeholder with only the title and the text processing. In the HTML of this placeholder are also some ID\’s as parameters for the javascript REST call to fetch the content after the page is loaded. This fetch is not executed (correct).
To work correct Javascript must be enabled in a browser with version newer than 2016 but not in Internet Explorer.
This is probably caused because the javascript view file with the fetch command is not loaded e.g. in the editor of Elementor or an other pagebuilder that tries to show a preview of the widget but does not load the necessary Javascript. This is a known issue, you could work around it by first set “Use WordPress timezone settings, no REST” until you are satisfied with all the other settings and then set “Use Client timezone …”.
If you change the Sibid without clicking the Update button, the new Sibid may already be saved in the plugin options for the REST call, but not in the block attributes. If you still click Update, the problem will be resolved.
The REST call might also have failed by other reasons, then another try would probably solve the issue, but I have never seen that in testing.
If you cannot resolve it, you can of course report an error / question in our community support forum

Can I use an event calendar that only uses days, not times, like a holiday calendar?

Yes you can, since v1.2.0, I have tested with .

This block has encountered an error and cannot be previewed

Probably you have (re)opened a page where the block is edited but your password cookie is expired.
Log in in WordPress again and open the page again. The block will be available.

How do I set different colours and text size for the dates, the summary, and the details?

There is no setting for the color or font of parts in this plugin.
My philosophy is that layout and code/content should be separated as much as possible.
Furthermore, the plugin should seamlessly fit the style of the website and be fully customizable via CSS

So for color and font, the settings of the theme are used and are then applied via CSS.
But you can give each element within the plugin its own style (such as color and font size) from the theme via CSS.

If you know your theme css well and it contains classes you want to use on these fields you can add those class-names in

Otherwise you can add a block of additional CSS (or extra css or user css or something like that), which is possible with most themes.
In order to target the CSS very specifically to the simple-ical-block, it is best to enter something unique in the settings of the block/widget under Advanced in "HTML ANCHOR", for example 'Simple-ical-Block-1' the code translated into a high-level ID of the block.
With the next block of additional CSS you can make the Dates red and 24 px, the Summary blue and 16 px,
and the Details green with a gray background.

/*additional CSS for Simple-ical-Block-1 */
#Simple-ical-Block-1 .ical-date {
color: #ff0000;
font-size: 24px;
#Simple-ical-Block-1 .ical_summary {
color: #0000ff;
font-size: 16px;
#Simple-ical-Block-1 .ical_details {
color: #00ff00;
background-color: gray;
font-size: 16px;
/*end additional CSS for Simple-ical-Block-1 */

How do I contribute to Simple Google Calendar Outlook Events Widget?

We’d love your help! Here’s a few things you can do:


June 20, 2023 1 reply
Small but powerful plugin that has all the functions I need without messing your backend with complicate settings.
April 17, 2022
Exactly what I wanted. Small, simple plugin to add google calendar on the sidebar which I can customize with CSS.
April 7, 2022
Its a great plugin, that does what it should. Getting calendar data from a http source in ICS-Format and displaying it as a nice little widget. Big shoutout to the maintainer, he‘s responding very quick to questions or problems. Awesome work!
Read all 3 reviews

Contributors & Developers

“Simple Google Calendar Outlook Events Block Widget” is open source software. The following people have contributed to this plugin.


“Simple Google Calendar Outlook Events Block Widget” has been translated into 2 locales. Thank you to the translators for their contributions.

Translate “Simple Google Calendar Outlook Events Block Widget” into your language.

Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.


  • 2.4.0 exclude DTEND from event that is evend ends before (<) DTEND in stead of at (<=) DTEND. removed modulo 4
    Checks if time zone ID with Etc/GMT ‘replaced by’Etc/GMT+’ is a Iana timezone then return this timezone.
  • 2.3.1 Tie moving display events window created by Now and ‘Number of days after today’ to the display time instead of the data-retrieve/cache time. Make it possible to let the window start at 0H00 and end at 23H59 local time of the startdate and enddate of the window in addition to the current solution where both ends are at the time of the day the data is displayed/retrieved. Add to description output to make it easier to refer to in css. Remove HTML for block title when title is empty. Add unescape \ to \ and improve \, to , \; to ; chars that should be escaped following the text specification. Extra save attributes in widget option to increase the chance the REST call finds them in that option.
    Tested with WP 5.3 (only widget) 5.9, 6.4 (block and widget in legacy block and in Elementor) 6.5 RC 4
  • 2.2.1 20240123 after an isue of black88mx6 in support forum: don’t display description line when excerpt-length = 0
  • 20240324 teste with 6.5 RC 3
  • 2.2.0 after an issue of gonzob (@gonzob) in WP support forum: ‘Bug with repeating events’ improved handling of EXDATE so that also the first event of a recurrent set can be excluded.
    Basic parse Recurrence-ID (only one Recurrence-ID event to replace one occurrence of the recurrent set) to support changes in individual recurrent events in Google Calendar. Remove _ chars from UID.
    Changed textdomain from simple_ical to simple-google-icalendar-widget to make translations work by following the WP standard.
    Add help text’s in block settings panel.
    Tested with WordPress 6.4.
  • 2.1.5 20230824 after an issue of johansam (@johansam) in wp support forum: ‘Warning: Undefined array key’ reviewed and improved initialising of options for legacy widget.
  • 2.1.4 20230725 tested with WordPress 6.3-RC1 running Twenty Twenty-Two theme.
    20230626 added quotes to the options of the Layout SelectControl in simple-ical-block.js conform / Block Editor Handbook / Reference Guides / Component Reference / SelectControl to emphasize that the return value is a string;
    To make transform smoother: Add parseInt to all integers in transform and added missing transformations in block.js
    Solved a number of typos in dateformat_… in update function in widget.php that prevented saving some options/settings.
  • 2.1.3 After a feature request of achimmm (in github on Joomla module) added optional placeholder HTML output when no upcoming events are avalable. Also added optional output after the events list (when upcoming events are available).
    added parseInt on line 147(148) of simple-ical-block.js to keep layout in block-editor
  • 2.1.2 fix classes from calendar id and improve hierarchical layout
  • 2.1.1 In response to a support issue of (@marijnvr). New lay-out for block with first date line on a higer level li. ‘Start with summary’ toggle-setting changed in ‘layout’ select-setting with options ‘Startdate higher level’, ‘Start with summary’, ‘Old style’.
    After some testing with Elementor:
    Synchronize widget lay-out with block layout by largely using the same code.
    In widget use ID based on timestamp in blockid setting. To be sure that ID in frontend is the same as in admin form. (this was not always so with the ID based on instance-id of widget). Added reset ID in settings to change the ID once and in the same time clear the transient cache which is named after the blockid. Removed clear cache now setting in widget because ResetId is more reliable.
  • 2.1.0 Support more calendars in one module/block. Support DURATION of event. Move processing ‘allowhtml’ complete out Parser to template/block.
    Use properties in IcsParser to limit copying of input params in several functions.
    Solved issue: Warning: date() expects at most 2 parameters, 3 given in …IcsParser.php on line 549 caused by wp_date() / date() replacement in v2.0.4.
    Support BYSETPOS in response to a github issue on the WP block of peppergrayxyz. Support WKST.
  • 2.0.4 Improvements IcsParser made as a result of porting to Joomla
  • notably solve issue not recognizing http as a valid protocol in array(‘http’, ‘https’, ‘webcal’) because index = 0 so added 1 as starting index
  • make timezone-string a property of the object filled with the time-zone setting of the CMS (get_option(‘timezone_string’)).
  • replace wp_date() by date() because translation of weekday- and month-names is not needed here.
  • 2.0.3 Added initial values for new attributes in transform.
  • 2.0.2 For block: Added enddate (only when different from startdate) and endtime for first line and summary line, boolean start with summary, selectlist for summary tag,
  • HTML anchor and improved security by using wp_kess on formatted datetimes. Removed editor style.
  • For all: Improved handling of enddate for recurrent events with DATEs (no times) and selection recurrent events also when enddate is after now (was already so with single events)
  • 2.0.1 Added transform from widget to block. Removed support for anchor because it doesn’t work and gives error if you don’t save more then attributes. added example.
  • 2.0.0 Created a native Gutenberg Block Simple ical Block next to the old the widget when using WP 5.9 or higher with the same backend code and almost the same frontend.
  • 1.5.1 After more testing and solving some issues with recurring events and daylight saving time removed the old correction for DST and the temporary checkbox to turn this correction off. Now there is only a correction when time is changed because the calculated time does not exists during transition from ST to DST. In that case in the next recursion the hour and minutes are set back to their beginvalue. Renamed and namespaced classes. Improved Zerodate to UTC-timezone processing. Restructured the IcsParse class a bit.
    20220516 tested up to 6.0 (RC2)
  • 1.5.0 in response to a github issue of fhennies added a checkbox to allow safe html in the output. Added wp_kses() function to run for description, digest and location, to echo only html considered safe for wordpress posts, thus preserving some security against XSS.
    Extra options for parser in array $instance and added temporary new option notprocessdst to don’t process differences in DST between start of series events and the current event. (in response to a WP support topic of @wurzelserver)
    7-4-2022 tested with wordpress 5.9.1
  • 1.4.1 in response to a support topic of edwindekuiper (@edwindekuiper) fixed timezone error: If timezone appointment is empty or incorrect
    timezone fall back was to new \DateTimeZone(get_option(‘timezone_string’)) but with UTC+… UTC-… timezonesetting this string is empty
    so I use now wp_timezone() and if even that fails fall back to new \DateTimeZone(‘UTC’).
  • 1.4.0 added parameter excerptlength to limit the length in characters of the description in respons to a comment of justmigrating (@justmigrating).
    Fixed a trim error that occurred in a previous version, revising the entire trimming so that both \r\n and \n end of lines are handled properly
    12-7-2021 tested with 5.8-RC2 and set tested up to to 5.8
  • 1.3.1 tested with Outlook and found that different timezones were a problem, solved by using a conversion tabel between Microsoft timezones and Iana timezones and using local (WordPress configuration) timezone when timezone is unknown.
    Also found that colon ended description and summary. Found a solution for that so now you can use a colon in a description or a summary.
    Tested with iCloud Apple Calendar, timezones seem to be Iana. Issue with url starting with webcal protocol in stead of http or https, work around is substituting webcal with https:, but solved by change in url check and stricter validation Google Id.
  • 1.3.0 made time formats of appointment/event times configurable in response to a comment of carolynclarkdfw (@carolynclarkdfw) on the plugin page. Tested with wordpress 5.7
  • 1.2.2 added a checkbox to clear cache before expiration in response to a comment of TrojanObelix.
  • 1.2.1 handle not available DTEND => !isset($e->end) in response to a comment of lillyberger (@lillyberger) on the plugin page, by defaulting $e->end to DTSTART value.
    tested with
  • 1.2.0 adjustment not to display time on events that have DTSTART in DATE format instead of DATETIME format after a comment of TrojanObelix.
    found that date_i18n($format, $timestamp) formats according to the locale, but not the timezone so times and sometimes also dates
    went wrong, but the newer function wp_date() does, so date_i18n() replaced bij wp_date() (that means wp 5.3.0 is now required).
    adjusted use of ID’s for the events also to work when lineseperator is \n in stead of \r\n after seeing example by of TrojanObelix.
    Tested with WP 5.5.3.
  • 1.1.0 parse EXDATE to exclude events from repeat
  • 1.0.3 trim only “\n\r\0” and first space but keep last space in Description Summary and Location lines.
    adjustments to correct timezone that is ignored in new datetime when the $time parameter is a UNIX timestamp (e.g. @946684800)
  • 1.0.2 Adjustments for multiline Description, summary or location. Tested with wp 5.2.1.
  • 1.0.1 PHP 7.2 deprecated create_function changed in anonymous function in widget_init. Tested with wp 5.0.3
  • 1.0.0 first version in WP plugin directory, directory and start php renamed after slug simple-google-icalendar-widget
  • 0.7.0 BYDAY with DAILY frequency tested. Test code deleted. Present as RC to wordpress.
  • 0.6.0 BYDAY and BYMONTHDAY work with complete sorting and unifying in MONTH frequency
    adding class suffixes from setting.
  • 0.5.0 BYDAY complete first try with sort tested with wordpress 4.8.3 php 7
  • 0.3.5 discard non existent days like 31th november first try with byday
    works als with complete url to ical .ics file.
    renamed plugin to simple-google-i-calendar-widget and
    renamed references gcal to ical
  • 0.3.3 simple repeating events (only full periods) works* 0.7.0 BYDAY with DAILY frequency tested. Test code deleted. Present as RC to wordpress.
  • 0.2.0 starting work on repeating events
  • 0.1.0 Added support for start and end time with timezone
    Changed lay-out of output of teh widget so that is more in line with bootstrap 4 and with the iframe-widget of google
    a lot of small changes eg: better support for events in a timezone and events that last a whole day. Replace escaped chars for summary,
    description and location. Refinements in output HTML.
    renamed starting .php file to simple-google-calendar-widget.php
  • 0.0 imported V0.7 of NBoehr