Anyway, you don't need to worry, BC/AD has not lost at all to the metric system or Kwanzaa, it is still very much what is used and recognized (but I haven't looked at any high school history books lately).
the Western one) without having to have some special knowledge about what "anno domini" means or who Christ is.
Wikipedia also mentions an issue with the Julian Calendar and the Gregorian Calendar historically both using AD/BC, leading to some confusion as to which calendar system is being referred to: The terms "Common Era", "Anno Domini", "Before the Common Era" and "Before Christ" can be applied to dates that rely on either the Julian calendar or the Gregorian calendar.
Astronomers of course have the best solution - just count days.
While this issue always seems to get mired in arguments about political correctness, I'd offer another perspective.
Personally I always thought it was MORE culturally insensitive.
BC is "before christ", whether you believe in him or not.Modern dates are understood in the Western world to be in the Gregorian calendar, but for older dates writers should specify the calendar used.Dates in the Gregorian calendar in the Western world have always used the era designated in English as Anno Domini or Common Era, but over the millennia a wide variety of eras have been used with the Julian calendar.Nothing of a religious ad dating system happened during 1 BCE and 1 CE ad dating system in fact nothing of truly momentous importance happened at all, to our knowledge. The ad dating system of birth of Jesus of Nazareth is not stated in the gospels or in any secular text, but most ad dating system assume a date of birth between 6 BC and 4 BC.We also summarize the methods and process of converting dates between different calendar systems and add some final thoughts on the Anno Domini system as it relates to the Christian era.Nature, A English edition of that book has the title page English - so far, the earliest-found usage of Vulgar Era in English.