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Anniversary calculator
Calculator computes what day is after adding (or subtracking) given number of days to your date.

Beta version

This online calculator is currently under heavy development. It may or it may NOT work correctly.
You CAN try to use it. You CAN even get the proper results.
However, please VERIFY all results on your own, as the level of completion of this item is NOT CONFIRMED.
Feel free to send any ideas and comments !

Input data - start date and number of days to count

Start date
Number of days to add/subtract
Don't includeSaturdaysSundaysPublic holidays
Your region
(needed to adjust holidays list)

Results - dates of computed anniversaries

Start date
2017-08-20 (sunday)
50 days later
2017-10-09 (tuesday)
50 days before
2017-07-01 (thursday)
100 days anniversary
2017-11-28 (wednesday)
1000 days anniversary
2020-05-16 (sunday)
100 days before
2017-05-12 (monday)
1000 days before
2014-11-24 (sunday)

Some facts

  • We may think, that adding or subtracting a few days to (from) given date is a piece of cake. However, if we go on deeper, we will found there are many troubles related. Some months have 30, but another 31 days. Hey, but February has only 28 days! But, wait... once every four years February has 29 days. But which years are leap and which one no? Argh! Maybe it will be easier to use Calculla?

What is the meaning of each calculator field ?

  • Start date - it is date used as reference to all further calculations. For example, if you want to know what date will be 50 days after Easter set this field to Easter day and number of days to 50.
  • Number of days to add/subtract - this is a number of days, which will be added (and subtracted) from your reference date set in "start date" field.
  • Don't include (Saturdays/Sundays/public holidays) - use this fields to exclude selected days from calculations. For example you can use this option if you're interested in counting next 20 working days from today. In this case you should exclude all non-working days i.e.: Saturdays, Sundays and public holidays.
  • Your region - this option is used only, when holidays exclusion is enabled (see "Don't include" field). Basing on this field, Calculla can adjust list of known holidays to place, where you live.

Tags and links to this website

Links to external sites (leaving Calculla?)

Ancient version of this site - links

"Calculla v1" version of this calculatorIn December 2016 the Calculla website has been republished using new technologies and all calculators have been rewritten. Old version of the Calculla is still available through this link: v1.calculla.com. We left the version 1 of Calculla untouched for archvial purposes.
Direct link to the old version:
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