|With years, AD is written before the year, and BC is written afterwards.|
The abbreviation AD (Anno Domini) denotes of the Christian Era and should be written before the year; whereas,
BC (Before Christ) should be written after the year.
CATER TO RELIGIOUS DIVERSITY
BCE (Before Common Era) equates to the time before Christ (BC). CE (Common Era) equates to the time after the birth of Christ (AD). They are often used to cater to religious diversity. Both are written after the date.