FWK

What is the FWK

The "Fixed Week Calendar" (DE: Fixierter Wochenkalender) is a calendar similar to the International Fixed Calendar except it makes sure the week starts on a Monday as per the internationally agreed on time keeping standard ISO 8601. In this calendar, each year has the exact same layout. There's 13 months with exactly 4 weeks à 7 days for a total of 28 days each. This results in a year being 364 days long.

Year day

To fix the discrepancy with a real year, every year ends with a special day called "year day" that is not part of a week. The change from the last week of a year to the first week of the next year looks as follows:
..., Saturday, Sunday, Year day, Monday, Tuesday, ...

Leap year

Leap years also exist, and they follow the rules of the gregorian calendar because those rules are accurate (enough). This day is inserted in a similar fashion as the Year day at the end of June, and is named "leap day". This day also does not belong to a week, and sits between Sunday and Monday.

The Gregorian calendar contains a leap year in every year where at least one of these two rules are met:
- The year is divisible by 400
- The year is divisible by 4 but not 100

Leap seconds

There are already provisions for adding and removing individual seconds from a day to keep our clocks in sync with earths rotation. Time is not part of FWK, but FWK suggests that leap seconds shall be handled on leap day and year day whenever possible. If it is not possible to wait for year day due to the absence of leap day in combination with a large required correction, 28th of June should be used (the day before where leap day would be)

Public holidays

The inventor of this calendar suggests that these two days are global holidays. As few people as possible should be working on that day.

The extra month

The extra month is called "Sol" ("sun" in latin) and sits between June and July. The month has no special properties and works like any other month. The month is named after the sun because it contains a significant solar event, the summer solstice (northern hemisphere) or winter solstice (southern hemisphere).

The reason leap day is in June instead of Sol is to distribute them more evenly across the year. If the year were to be split into two equal parts, the split would happen in Sol between week 26 and 27. If leap day were in Sol, the latter half of the year would contain both special days. Other than that, there is no reason to have leap day in june.

Advantages

There are multiple advantages compared to the gregorian calendar:

• Changing the calendar in this way ensures that each year has the same layout.
• Making the special days not part of the week keeps the weeks aligned to the year.
• In the gregorian calendar, there is almost always a week that crosses the year boundary, and multiple standards exist that define when that week is part of the old or new year. Making every year start with the first day of the first week does away with this because weeks never cross the year boundary.
• Every day in a given month is the same weekday in every other month.
• Not changing the number of days in a week still allows for the year to be cut into four parts because it contains exactly 52 weeks, which is divisible into 4×13 weeks. These four parts will also be more equal in length relative to each other compared to qurters based on the month in the gregorian calendar.

Calendar script

You can download the FWK calendar script here. Or if you prefer typescript, here.

Time

FWK has no impact on how we keep time. If you want to change that too, I can offer you decimal time.