I really like the Holocene Calendar.  It adds ten thousand to any given anno domini, and thus moves the start of the calendar to 12016 years ago from today.  For anything that happened before that, we&#x27;re nearly guaranteed to not have very certain dates, so it&#x27;s very uncommon to need to use BHE (before holocene era) with the holocene calendar. 4 B.C.E is 9997 HE, 753 B.C.E. is 9248 HE (Holocene era).  For AD add 10.000, for BC subtract from 10.001, as it has a year zero.  And even the dates for the construction of Gobeklitepe can be expressed in positive years.