Roman Date

Gregorian year in Roman
Convert
I (1)V (5)X (10)
L (50)C (100)D (500)M (1000)
12345
67890

Result

Gregorian (Christian) [AD]

Other calendars - 1998 

Muslim Lunar (Hijra) [AH]
Hebrew (Jewish) [JE]
Iranian Solar [SH]
Japanese (Heisei)