The SBLHS 2 §8.1.2 recommends the use of all caps without periods in abbreviations of chronological eras (see also CMS §9.35): AD anno Domini (in the year of our Lord) AH anno Hegirae (in the year of [Muhammad’s] Hegira) BC before Christ BCE before the Common Era BP before the present CE Common Era Note … Continue reading Eras and Time Periods