AD:
In Latin, Anno Domini i.e. in the year of the lord
in English. The year 1 start after the Prophet Jesus (Peace Be Upon Him).
BC:
The years are counted before Christ
i.e. The appearance or birth of the Prophet Jesus (Peace Be Upon Him)
CE:
The Current Era
are the new alternate and replacement of AD.
BCE:
The Before Current Era
are the new alternate and replacement of BC.
H,AH or Hijra:
Anno Hegiræ i.e. After Hijra, The migration of the Last Prophet of Islam Muhammad (Peace Be Upon Him) from Makkah to Madinah.
Posted Status in History