The Modern Fixed Calendar is :
• A 13-month calendar with 4 weeks of 7 days each.
• The last week of the year has 8 days, for a total of 365 days.
• In leap years, the last week of the seventh month also has 8 days, for a total of 366 days.
• The names of the days and months are in Esperanto.
• Only two calendar models are possible: the normal year and the leap year.
Total Predictability : The first day of the week is always a Monday (Lundo) and the last a Sunday (Dimanĉo). Birthdays always fall on the same day of the year.
- Economic Fairness :Each month has exactly the same number of working days. No more loss-making Februarys and overloaded Marches for businesses.
Unity Through Language : By using Esperanto (Lundo… Dimanĉo), the calendar becomes neutral and accessible to all, without favoring any specific culture.
Mathematical Simplicity: A year of 13 months of 28 days, plus one extra day at the end of the year, is simple and repetitive math. No more puzzle-solving calendars.
The history of the Calendar
Numerous calendars have been developed throughout history. Different civilisations devised calculation systems using structures or tables to measure the passage of time throughout the years. These tools met their needs for scheduling the days and periods of the year in order to plan their survival activities or festivities.
Lunar Calendar
Early calendars were often based on the phases of the moon. Lunar cycles provided a relatively easy-to-observe measure of time, which led to the creation of lunar calendars in many ancient cultures.
The Julian calendar
The first Roman calendar, introduced around the 7th century BC, divided a 304-day year beginning with March into ten months. January and February were added later. As the months only contained 29 or 30 days, another month had to be inserted, roughly every other year. The months were designated by counting backwards from three pivotal dates: the calendas at the beginning of the month, the ides in the middle and the nones, which fell on the ninth day before the ides. This calendar became hopelessly confused when the Roman rulers who were responsible for setting the days and months to be added abused their authority to extend their term of office or change the date of elections.
In 46 BC. Julius Caesar decided, on the advice of the Greek astronomer Sosigenes, to establish a new calendar. This calendar, known as the Julian calendar, set the length of a normal year at 365 days and that of a leap year, every 4 years, at 366 days, with 24 February as the double day. Caesar also changed the start of the year from March 1 to January 1.
Gregorian calendar
The Julian calendar was a great step forward, but it kept getting out of step with the spring equinox. It was in 1582 that Pope Gregory XIII decided to correct the error of the Julian calendar. He removed ten days from the calendar to realign the spring equinox with 21 March, and corrected the calculation of leap years. The Gregorian calendar is still used today in most countries of the world.
The oddities of the gregorian calendar
Unequal months
Even after several revisions, the calendar is still composed of unequal months, designed on the basis of superstition or religious beliefs:
– 7 months of 31 days
– 4 months of 30 days
– 1 month of 28 days (or 29 days)
A wide variety of anual calendars
There are fourteen different versions of the Gregorian calendar. The current design of the calendar means that consecutive years are all different and birthdays always fall on different days.
Why the Fixed Modern Calendar?
To meet the needs of today’s society, it is necessary to bring order to our calendar and offer a more structured option, free of ambiguities and accessible to all people.
It is to meet this need that the Modern Fixed Calendar was designed: a clean, uniform, and repetitive calendar. The names of the days and months are in Esperanto, a universal language accessible to all people.
The Modern Fixed Calendar, a calendar full of common sense
In conclusion
What if our time finally became simple ?
Today, our calendar is irregular, unpredictable, and unnecessarily complex. Months vary, dates shift, and planning becomes a challenge.
The Modern Fixed Calendar changes everything.
13 months of 28 days. 4 perfect weeks per month. Every date falls on the same weekday, every year. A clear, stable, and logical structure—ideal for work, education, and everyday life. The names of the days and months in Esperanto, a language accessible to all.
And to mark the passage of time, a unique day—Ĝis—concludes the year, outside the weekly cycle, as a universal moment of transition.
Less confusion. More consistency.
Time, finally mastered.
With the Modern Fixed Calendar
The Excel file of the Modern Fixed Calendar
The following link allows you to download the Modern Calendar as an Excel file. The document consists of three tabs:
- Modern Calendar Rules : Indicates the rules governing the Modern Calendar.
- Modern : Displays the Modern Calendar allowing you to choose the desired year and including a date conversion table between the Gregorian Calendar and the Modern calendar.
- Gregorian : Displays the Gregorian calendar allowing you to choose the desired year.