December has 31 days in the Gregorian calendar, as that is the calendar that we now use.
Not in the Gregorian calendar.
Febuary
The shortest "month" of the Gregorian calendar has 28 days.
No months in the Gregorian calendar have 80 days.
The eighth month of a year of the Gregorian calendar, August, has 31 days.
July is the seventh month of the year in the Gregorian Calendar and one of seven Gregorian months with the length of 31 days.
April has 30 days in the modern Gregorian calendar.
In the Gregorian calendar, each month does not - so the question is misguided.
Yes, this has been standardized in the Gregorian calendar.
The month in which the Gregorian Calendar was adopted, because when it was proposed in 1582, there was a difference of 10 days between it and the earlier Julian calendar, and that difference had grown to 13 days by the time that the last countries adhering to the Julian Calendar (Greece and Russia) switched over to the Gregorian Calendar. Because of the "loss" of between 10 and 13 days, the month in which a particular country adopted the Gregorian Calendar might not have had a full moon.
1. Chet has 31 days and according to the Gregorian calendar it comes in the months of March-April 2. Vaisakhhas 31 days and according to the Gregorian calendar it comes in the months of April-June 3. Jeth has 31 days and according to the Gregorian calendar it comes in the months of June-July 4. Harh has 31 days and according to the Gregorian calendar it comes in the months of July-August 5. Sawan has 31 days and according to the Gregorian calendar it comes in the months of August-September 6. Bhadon has 30 days and according to the Gregorian calendar it comes in the months of September-October 7. Assu has 30 days and according to the Gregorian calendar it comes in the months of September-October 8. Katak has 30 days and according to the Gregorian it comes in the months of October-November 9. Maghar has 30 days and according to the Gregorian calendar it comes in the months of November-December 10. Poh has 30 days and according to the Gregorian calendar it comes in the months of December-January 11. Magh has 30 days and according to the Gregorian calendar it comes in the months of January-Febuary 12. Phagun has 30/31 days and according to the Gregorian calendar it comes in the months of Febuary-March Gregorian Calendar: Is the calendar that we use for our day to day lives; the calendar that we refer to.
The Gregorian Calendar is an almost identical improvement on the Julian Calendar. The names of the months and the number of days per month are the same. The only difference is that the Gregorian Calendar has three fewer leap year days out of every 400 years. The Julian Calendar averages 365.25 days per year, and the Gregorian Calendar averages 365.2425 days per year. It doesn't seem like much, but after using the Julian calendar for 1 1/2 millennia the accumulated error totaled about 10 days.