The History Of Time

Since 1900, the entire world using the system in AD. Although in 1422 Portugal became the last European countries that apply this calendar system, many of the kingdom in Asia and Africa have not yet used the system in AD.
Early in AD (derived from Arabic) refers to the year which is considered as the year of the birth of Prophet Isa Al-Masih because the calendar is called Masihiyah or Jesus of Nazareth. In contrast, the term BCE (BCE) refers to the period before that year. Most non-Christians often use the abbreviations AD and BC without reference to the Christian connotations. Dating system refers to the initial year of our Lord began to be adopted in Western Europe during the 8th century.
While year 1 is considered as the birth of Jesus, but the historical evidence is too little to support it. Experts menanggali birth of Jesus in all sorts, from 18 BC to 7 BC.
Historians do not know the year 0-1 M is the first year AD system and exactly one year before the year 1 BC. In the calculations of science, especially in the astronomical calendar year, this is problematic because BC is calculated using the number 0, then there is a difference of 1 year between the two systems.
In Indonesia, instead of AD which is used officially, unofficially people also recognize the year AH / in Java, the year of the Lunar / Chinese years and years Caka / year Hinduism.
In English and used internationally, the term CE is called using the Latin Anno Domini / AD (Year of our Lord) and BC known as Before Christ / BC (Before Christ). This system was designed years starting 525, but not so widely used until the 11th century until the 14th. In 1422, Portugal became the last European countries that apply this dating system. Dates AD itself had undergone a change in September 1752 on the initiative of Pope Gregory XIII to accelerate the 11 days as the correction of an error calculating the number of days in the previous system called the Julian system. Then follow the CE calendar called the Gregorian system to calculate it. After many independent countries in the 1900s, all countries in the world recognize and use this convention to facilitate communication.
Also in English also known as the Common Era / CE (Common Era) and Before Common Era / BCE (Before Common Era) when there are writers who do not want to use the name of the Christian year, although the calculation time remains on the Christian calculation.