The Gregorian calendar in force today in most countries of the world does not have the opinion of "the best possible". Even at the time of its announcement, it raised various objections. Although, rather for religious reasons. However, some scholars have also questioned it.

Many allegations have been made, namely:

• The months of the Gregorian calendar have an unequal number of days, the differences are quite large. We have 4 types of months: 28, 29, 30 and 31 days.

• The same can be said for the quarters, in which the number of days equals 90 (1st quarter), 91 (2nd quarter) and 92 (quarters III and IV).

• The half-years also show a large difference in terms of the number of days, the first of which has 181 (in a leap year - 182), the second 184.

• The ordering of the shorter and longer months is very irregular and requires special remembering.

• The same is true for decade periods, where the unevenness of decades of unequal length is even more troublesome.

• The day name cannot be determined for the specified date.

But do these objections - otherwise correct - make sense??

It turns out, yes. Especially for economists, planners and statisticians. In economic life, it is impossible to e.g.. compare months, quarters, half-year, etc.. The current calendar is also not the best for meteorologists. Because, for example,. determine the annual temperature? For what year: ordinary or leap? Besides - is it possible to compare e.g.. average temperature in January and February? After all, these are months with different values ​​of days!

The calendar, which has been in force for several hundred years, has entered people's consciousness and it is difficult to get rid of it. It has not only the charm of tradition, but it is also a link with the past. After all, tens of thousands of literary works and enormous scientific writings function within this calendar, it includes our history and culture. Despite this… it was decided to change this calendar, or at least reform.