No one person invented the calendar. Many cultures all over the world developed them for various reasons.
Some were purely for rituals others reflected the seasons or phases of the moon etc. As people became more sophisticated better and better and more accurate calendars were introduced.
Different months have a different number of days primarily because of historical and cultural reasons. The calendar we use today, called the Gregorian calendar, is a modification of the older Julian calendar. The lengths of months were determined based on a combination of factors including astronomical events, religious observances, and practical considerations. For example, February has fewer days because it was the last month to be added to the Roman calendar and was therefore given lesser importance.
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Different webaites provide option to display week number in calendar.
All twelve of them in the Western calendar have 28 days - though some have more. Some countries / religions used lunar or other calendars in which months may have a different number of days.
DATEDIF function computes the difference between two dates in a variety of different intervals, such as the number of years, months, or days between the dates.Syntax for DATEDIF: =DATEDIF(Date1, Date2, Interval)Date1 = first dateDate2 = second dateInterval = interval typeInterval Types:m = Months (complete calendar months between dates)d = Days (number of days between dates)y = Years (complete calendar years between dates)ym = Months Excluding Years (complete calendar months between dates like they were in the same year)yd = Days Excluding Years (complete calendar days between dates like they were in the same year)MD = Days Excluding Years And Months (complete calendar days between dates like they were in the same month and same year)
A month is not a fixed number of days, and calendar months vary in length. But the average is about 30.4, making 10 months about 304 days.
One can find on online advent calendar in a number of different places. One place is Calendar Me Up. This company's website has tons of different calendars to use.
The Vikings followed a lunar calender, dividing their years into 13 months, which is the number of new moons in one year.
The four names are the Roman calendar names meaning "seventh, eighth, ninth, and tenth" months. Originally the Roman calendar had 10 months that began in spring and did not include the first 61 winter days in a year.
Because 365 or 366 cannot be divided equally by 12. So some months have 30 and some 31 (and February only 28 or 29). There are many reasons, one is that when the calendar was being designed by the Romans, the Emperors Julius and Augustus insisted that the months named after them (July and August) had the full quota of 31. The history of the Gregorian calendar is complex and there is no single reason months have different number of days. It would take volumes to explain the reasoning behind the differences.
First letter of calendar months in English followed by units' digit of the number of days in that month.
30 days is the closest whole number to the average number of days in a calendar month, which is 30.4 days. But as you increase the number of months, you increase the inaccuracy, which by 12 months is off by 5 full days.