Pope Gregory XIII in 1582.
The Mayans, Egyptians, Babylonians, and Chinese all had calendars in the ancient days. The calendar we use to today was first developed by the Romans, under Julius Caesar (the Julian Calendar). That was modified by the Gregorian Calendar (named for Pope Gregory XIII), which we still use today
Pope Gregory mandated the use of the Gregorian calendar on February 24, 1582.
Julius Caesar improved the calendar by revising it and turning the old lunar calendar into a solar calendar. The solar calendar more accurately reflects the seasons. Pope Gregory made a few minor changes to Caesar's basic calendar and the Gregorian calendar is what we use today. However the Julian calendar, the one which Caesar produced, is still used in some instances today, especially religious ones.
All of the English month names are based on the Latin names of the Roman months. The calendar we use is the Gregorian calendar. It derives its name from Pope Gregory XIII who introduced some minor modifications to the Julian calendar in the 16th century. This means that we use a slightly modified version of the calendar introduced by Julius Caesar.
Apart from some minor changes introduced by Pope Gregory XIII in 1478,the calendar we still use today is the calendar which was created by Julius Caesar. Caesar reformed the Roman calendar, switching from a lunar to a solar one.
The Sumariens created the calendar that we use today.
No. The mayans made the calendar and this calendar is what we use today.
The Mr gazzi calendar
I can't see "this" calendar.
It is the Gregorian calendar which we use today
The most common calendar used internationally today is the Gregorian calendar, which is Pope Gregory XIII's 1582 reform of the Julian calendar. Some non-Christian countries use the Gregorian calendar for civil and/or international purposes and another calendar for religious/ internal use. This is because (a) the Gregorian calendar is considered a Christian calendar, since the numbering of its years is based on the wrongly calculated year of the birth of Jesus, and (b) many festivals are based on the phases of the moon, and the Gregorian is neither a lunar calendar, like the Islamic Hijra, nor a lunisolar calendar, like the Hebrew Luach.
The calendar that we use today is called the Gregorian calendar, created by Pope Gregory XIII. Before that, there was the Roman calendar, which was a lunar calendar, comprising 10 months and an intercalated month. Next came the Julian calendar, a twelve-month solar calendar introduced by Julius Caesar in 46 bc, consisting of 365 days, with an extra day every four years.