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Holiday Calculator

Unfortunately, Oracle has effectively decommitted Applets. This means you can no longer run the various CMP programs in a browser. You must download them and install them. You must have the most recent Java JRE (Java Runtime Environment) 1.8.0_131 32-bit or 64-bit. It no longer matters which browser you use.
Oracle has effectively decommited Applets, so this Applet will no longer run online in your browser, but it is a hybrid you can also download, install and run it on your own machine as standalone application. It will start and run faster if you do that. It will also work safely even if you have disabled Java in your browser.


This Applet calculates when various holidays occur in any given year BC or AD. It is designed to be cannibalised to include the calculation routines in your own programs. You might use it to prepare paper calendars well in advance or electronic calendars. You might also use the logic in computer programs that compute payrolls, bus schedules, or club meetings. You might use it in writing novels or researching historical events. It can also be used as an Applet or a standalone application.

Types Of Holidays

Many holidays and celebrations occur at the same fixed date each year. Others occur always occur on some special day of the week, or move around wildly, like Easter which is based on the phases of the moon. Others like the equinoxes are based on astronomy. Some events, like presidential inaugurations, don’t happen every year. Some, have moved around over the years. I have posted Java code to calculate to following holidays given the year.

January February March April May June
New Year’s Day Groundhog Day Mardi Gras April Fools’ Day Cinco de Mayo Sorry Day
Martin Luther King Day Sweater Day Ash Wednesday Palm Sunday Europe Day Australian Queen’s Birthday
Robbie Burns Day aka Burns Nicht BC Family Day Daylight Saving Time Start Good Friday Mother’s Day Father’s Day
Australia Day Darwin Day Commonwealth Day Easter Sunday Armed Forces Day Summer Solstice
  Valentine’s Day St. Patrick’s day Easter Monday Victoria Day Aboriginal Day
  Presidents Day Vernal Equinox Earth Day Memorial Day St. Jean-Baptiste Day
  Alberta Family Day Earth Hour ANZAC Day    
July August September October November December
Canada Day Canada Civic Day Canadian Labour Day Canadian Thanksgiving Daylight Saving Time End World AIDS Day
Bag Free Day   American Labor Day Columbus Day General Election Day Human Rights Day
Independence Day   Change Your Passwords Day Creationism Day Remembrance Day Winter Solstice
Utah Pioneer Day   Grandparents Day Halloween Veterans Day Christmas Eve
Parents' Day   Autumnal Equinox   American Thanksgiving Christmas in UK and Canada
    Orange Shirt Day   Black Friday Christmas in the USA
        St. Andrews Day Boxing Day in UK and Canada
          New Year’s Eve
You will note these are not all holy-days or holidays you get off work. They are not necessarily even celebrations I use the term holiday very broadly to include any regularly recurring special day on the calendar.

The holiday I plan to add next is Chinese New Year which has a complex formula.

This Applet below will show you when all the holidays occur in any given year, BC or AD. If the holiday was not celebrated in that year, it will not appear. It will also show you the nearest weekday to any given holiday.

Please report any errors via email. If you are willing to provide the rules for calculating your favourite holidays, I will add them too.

The program is also available with Java source to download and run it either as an Applet or an application.

Applet failed to run. No Java 1.8 or later plug-in found.

Java Requirements and Troubleshooting

Holidays is a signed Java Applet (that can also be run as an application) to Holiday Calculator. You are welcome to install it on your own website. If it does not work…
  1. For this Applet hybrid to work, you must click grant/accept/always run on this site/I accept the risk to give it permission to let you copy/paste. If you refuse to grant permission, the program may crash with an inscrutable stack dump on the console complaining about AccessController.checkPermission.
  2. In the Java Control Panel security tab, click Start ⇒ Control Panel ⇒ Programs ⇒ Java ⇒ Security, configure medium security to allow self-signed and vanilla unsigned applets to run. If medium is not available, or if Java security is blocking you from running the program, configure high security and add to the Exception Site List at the bottom of the security tab.
  3. Often problems can be fixed simply by clicking the reload button on your browser.
  4. Make sure you have both JavaScript and Java enabled in your browser.
  5. Make sure the Java in your browser is enabled in the security tab of the Java Control panel. Click Start ⇒ Control Panel ⇒ Programs ⇒ Java ⇒ Security ⇒ Enable Java Content in the browser.
  6. This signed Java Applet (that can also be run as an application) needs 32-bit or 64-bit Java 1.8 or later. For best results use the latest 1.8.0_131 Java.
  7. You also need a recent browser.
  8. It works under any operating system that supports Java e.g. W2K, XP, W2003, Vista, W2008, W7-32, W7-64, W8-32, W8-64, W2012, W10-32, W10-64, Linux, LinuxARM, LinuxX86, LinuxX64, Ubuntu, Solaris, SolarisSPARC, SolarisSPARC64, SolarisX86, SolarisX64 and OSX
  9. You should see the Applet hybrid above looking much like this screenshot. If you don’t, the following hints should help you get it working:
  10. Optionally, you may permanently install the Canadian Mind Products code-signing certificate so you don’t have to grant each time.
  11. If the above Applet hybrid appears to freeze-up, click Alt-Esc repeatedly to check for any buried permission dialog box.
  12. If you have certificate troubles, check the installed certificates and remove or update any obsolete or suspected defective certificates. The only certificate used by this program is mindprodcert2017rsa.cer.
  13. Especially if this Applet hybrid has worked before, try clearing the browser cache and rebooting.
  14. To ensure your Java is up to date, check with Wassup. First, download it and run it as an application independent of your browser, then run it online as an Applet to add the complication of your browser.
  15. If the above Applet hybrid does not work, check the Java console for error messages.
  16. If the above Applet hybrid does not work, you might have better luck with the downloadable version available below.
  17. If you are using Mac OS X and would like an improved Look and Feel, download the QuaQua look & feel from UnZip the contained quaqua.jar and install it in ~/Library/Java/Extensions or one of the other ext dirs.
  18. Upgrade to the latest version of Internet Explorer or another browser.
  19. Click the Information bar, and then click Allow blocked content. Unfortunately, this also allows dangerous ActiveX code to run. However, you must do this in order to get access to perfectly-safe Java Applets running in a sandbox. This is part of Microsoft’s war on Java.
  20. Try upgrading to a more recent version of your browser, or try a different browser e.g. Firefox, SeaMonkey, IE or Avant.
  21. If you still can’t get the program working click the red HELP button below for more detail.
  22. If you can’t get the above Applet hybrid working after trying the advice above and from the red HELP button below, have bugs to report or ideas to improve the program or its documentation, please send me an email atemail Roedy Green.
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Holiday Calculator
5.2 2014-10-05 free Java
more infoprecisscreenshotbrowse source repository
for the current version of Holiday Calculator.
Calculates when various holidays occur in any given year BC or AD. Designed to be cannibalised to include the calculation routines in your own programs. Also calculates the nearest weekday to any given holiday.
download 3.7MB zip for Holiday Calculator Java source, compiled class files, jar and documentation to run on your own machine either as an application or an Applet.

Runs on any OS that supports Java e.g. W2K, XP, W2003, Vista, W2008, W7-32, W7-64, W8-32, W8-64, W2012, W10-32, W10-64, Linux, LinuxARM, LinuxX86, LinuxX64, Ubuntu, Solaris, SolarisSPARC, SolarisSPARC64, SolarisX86, SolarisX64 and OSX.

First install the most recent Java.

To install, extract the zip download with WinZip, (or similar unzip utility) into any directory you please, often J:\ — ticking off the use folder names option.

To check out the corresponding source from the Subversion repository, use the TortoiseSVN repo-browser to
access holidays source in repository with [Tortoise] Subversion client on

After you have installed the jar, you can run it as an application. Type:

java -jar J:\com\mindprod\holidays\holidays.jar

adjusting as necessary to account for where the jar file is.

download ASP PAD XML program description for the current version of Holiday Calculator.

$1989.00 US donated so far. If the CMP utilities solved your problem, please donate a buck or two, or donate to one of the charities featured in the footer public service ads throughout the website and get a tax receipt.

Holiday Calculator is free. Full source included. You may even include the source code, modified or unmodified in free/commercial open source/proprietary programs that you write and distribute. Non-military use only.
Canadian Statutory Holidays
J.R. Stockton’s Holiday Page

My least favourite holiday is Remembrance Day/Memorial Day. On that day, otherwise sane card-carrying liberals go gaga over soldiers who participate in illegal aggressive wars. I am not that keen on Easter either. Hypocrites who have nothing to do with religion all year show up to support an obsolete church whose only remaining function is pimping for its paedophilic clergy. As a child, my favourite holiday was Halloween. I liked the fireworks. As an adult, I like the way grown-ups let themselves play by dressing up in silly costumes.

Easter egg

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