The designation of time that refers to the dates after the birth of Christ using the year-numbering system of the Gregorian calendar. This was formerly shown as AD or the abbreviation for the Latin, Anno Domini (the year of the Lord). Common Era is almost always seen as in its abbreviated form, CE. The term Common Era and Anno Domini have the same value, so the year 2010 CE refers to the same year as 2010 AD. Both systems start with the year "1" and neither uses the year "zero". Common Era has also been referred to as "Christian Era" or "Current Era".