13 Month Calendar 2024

Month Calendar International Fixed Calendar Digital Print
Month Calendar International Fixed Calendar Digital Print

13 Month Calendar 2024: Everything You Need to Know

Key Takeaways


Aspect Details
Purpose Provides an alternative calendar system with 13 months
Structure 13 months of 28 days each, plus an extra day
Benefits Consistent month lengths, easier planning
Where to Find Online calendar websites, historical references
Historical Use Used by Eastman Kodak Company from 1928 to 1989


The concept of a 13-month calendar is intriguing and offers a unique approach to organizing the year. Unlike the traditional Gregorian calendar, which has 12 months of varying lengths, the 13-month calendar divides the year into 13 equal months of 28 days each. This system provides a more consistent and predictable structure for planning and scheduling. In this article, we’ll explore the details of the 13-month calendar for 2024, its benefits, and where you can find printable versions.

What is a 13 Month Calendar?

A 13-month calendar, also known as the International Fixed Calendar, was designed to simplify the calendar system by having each month consist of exactly 28 days. This results in 13 months, each with four weeks, plus an extra day at the end of the year known as “Year Day.”

Structure of the 13 Month Calendar

  • Months: 13 months, each with 28 days
  • Weeks: 4 weeks per month
  • Days: 364 days, plus 1 extra day (Year Day)
  • Leap Year: An additional day is added as “Leap Day”

Table 1: Comparison of Calendar Systems


Aspect Gregorian Calendar 13 Month Calendar
Months 12 months of varying lengths 13 months of 28 days each
Weeks per Month 4-5 weeks 4 weeks
Total Days 365 (366 in leap years) 364 + 1 extra day (365 in leap years)
Consistency Inconsistent month lengths Consistent month lengths

Benefits of the 13 Month Calendar

Using a 13-month calendar offers several advantages:

  • Consistency: Each month has the same number of days, making planning and scheduling easier.
  • Predictability: Every month starts on the same day of the week.
  • Simplified Accounting: Easier financial planning and accounting with equal month lengths.

Historical Use of the 13 Month Calendar

The 13-month calendar was notably used by the Eastman Kodak Company from 1928 to 1989. This system was implemented to streamline business operations and improve efficiency.

Table 2: Key Historical Facts


Year Event
1902 Calendar proposed by Moses B. Cotsworth
1928 Adopted by Eastman Kodak Company
1989 Discontinued by Eastman Kodak Company

Where to Find 13 Month Calendars

You can find printable 13-month calendars on various online platforms and historical references. Some popular sources include:

  • Online Calendar Websites: Websites like Calendar Labs and Time and Date.
  • Historical References: Information about the International Fixed Calendar can be found on Wikipedia

Customization Tips

To make the most of your 13-month calendar, consider customizing it to fit your specific needs:

  1. Add Personal Events: Mark important dates like birthdays, anniversaries, and appointments.
  2. Highlight Key Dates: Use colors or symbols to emphasize significant days.
  3. Include Notes: Add sections for notes, reminders, and to-do lists.
  4. Choose a Design: Select a template that matches your style and preferences.

Customization Tips

  • Use Colors: Different colors can help differentiate between types of events.
  • Symbols and Icons: Use icons to represent activities or tasks.
  • Space for Notes: Ensure there’s enough space for writing additional information.


The 13-month calendar offers a unique and consistent approach to organizing the year. With equal month lengths and predictable week structures, it simplifies planning and scheduling. Whether you’re interested in historical calendar systems or looking for a new way to organize your year, the 13-month calendar for 2024 is worth exploring.

Jumbo Large Print Wall Calendar months January to January it measures " wide x " in length when open.
Jumbo Large Print Wall Calendar months January to January it measures ” wide x ” in length when open.