The Months & Intercalaries tab allows for the adding and editing of months and intercalary periods for calendars in Fantasy Calendar. A calendar requires at least one month for it to be possible to be rendered and saved.

In order to create a new month or intercalary period, enter a name for it in the Name textbox and click the + (add) button. Once a timespan has been created you can edit how many days it is supposed to last by default in the textbox next to the name.

Months and Intercalary periods appear in the order in which they are listed. You can use the draggable icon () on the left hand side of any month in the list to rearrange them.

Month settings

The arrow icon opens the settings menu for the month or intercalary period, allowing to to edit more advanced options.


The interval option under Month Settings allows you to set how many years should be between this month appearing in your calendar. A month with an interval of 4 will only appear every 4th year. This allows you to set a month as a leap month, for example to use in a lunisolar calendar. A month that appears every year should have an interval of 1.


The offset option will shift the interval by as many years as you have been entered in its input.

So a month with a 4 year interval and a 1 year offset will appear every four years offset by one. So year 1, 5, 9, 13, etc.

Week settings

Week settings contains a checkbox for enabling a custom week for this month, as well as a number input for setting how many weekdays it should have. These allow for certain months to have a week of a different length or differently named weekdays than that of the normal weekdays.

By clicking "Quick Add", you are prompted with a pop-up that allows you to quickly enter however many weekdays you wish to add, as long as each one is on a new line.


For example, if you have a calendar with some months which are 24 days long and others that are 28 days long, the 24 day months might be divided into 3 weeks of 8 days each, while the 28 day long months might be divided into 4 weeks of 28 days.

Similarly, Roman style calendars using a Calens, Nones, Ides style week system might find this useful to let each month end 1 day before the Calens of the next month, regardless of the month length.

Intercalary Month settings

The intercalary months share all the same settings as a normal month, except that they cannot input any custom week, as an conventional intercalary month doesn't actually have any named weekdays.

Intercalary month act like normal months in most regards; they have a length and can have an interval and offset similar to months. Intercalary days are special in that they aren't considered to belong to any month or weekday flow, and they interrupt any ongoing week for the duration of the intercalary month. You can imagine this as a period days without with named weekdays, but you still group the days under a month name.