"Either CE and BCE or AD and BC can be used—spaced, undotted (without periods) and upper-case. Choose either the BC/AD or the BCE/CE system, but not both in the same article. Style guides generally recommend writing AD before a year (AD 1066) and after a century (2nd century AD); however, writing AD after the year (1066 AD) is also common in practice. The other abbreviations always appear after (1066 CE, 3700 BCE, 3700 BC). The absence of such an abbreviation indicates the default, CE/AD. It is inappropriate for a Wikipedia editor to change from one style to another unless there is a substantive reason; the Manual of Style favors neither system over the other."
See WP:MOSDATES --Rifleman 82 (talk) 01:46, 27 June 2008 (UTC)
Your edit to History of Sparta
In case you missed the point of User:Rifleman's suggestion above may I, once again, ask you to read the manual of style page that covers this?--Old Moonraker (talk) 14:49, 30 June 2008 (UTC)