A report on Calendar era and Spanish era

The dating clause from the [[:File:Donació d'Aragó i Peronella als Capítols matrimonials de Barbastre (1137).jpg|act of donation of 11 August 1137]] whereby King Ramiro II of Aragon betrothed his daughter Petronilla to Count Raymond Berengar IV of Barcelona and handed his kingdom over to him. The year is given in two forms: and.

The Spanish era (Æra Hispanica), sometimes called the era of Caesar, was a calendar era (year numbering system) commonly used in the states of the Iberian Peninsula from the 5th century until the 15th, when it was phased out in favour of the Anno Domini (AD) system.

- Spanish era

The Spanish era counted the years from 38 BC, probably the date of a new tax imposed by the Roman Republic on the subdued population of Iberia.

- Calendar era

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Anno Domini

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The terms anno Domini (AD) and before Christ (BC) are used to label or number years in the Julian and Gregorian calendars.

Statue of Charlemagne by Agostino Cornacchini (1725), at St. Peter's Basilica, Vatican City. Charlemagne promoted the usage of the Anno Domini epoch throughout the Carolingian Empire.

This calendar era is based on the traditionally reckoned year of the conception or birth of Jesus, AD counting years from the start of this epoch and BC denoting years before the start of the era.

In 1422, Portugal became the last Western European country to switch to the system begun by Dionysius.