In acronyms, ACM, in the Painean calendar (Paine, 1802AD) notation system, short for “after Christ myth”, as compared to BCM, refers to the dating system that dates calendar years starting from the zero year (0 ACM) of the Roman recension of the Christ resurrection myth or motif; generally, the date of the start of the Roman empire as judged by country power distributions on the histomap; year of the the birth of Jesus Christ (i.e. the monotheistic rescript of the Horus-Osiris god synretism, in religio-mythology speak; aka AD (Anno Domini) years in common parlance.
In 50 BC (703 AUC), Marcus Varro, amid the rise of the formation of the republic or city of Rome, as outlined below, invents the AUC dating system, meaning “from city [of Rome] founding” (Anno Urbis Conditae):
- 753 BC - The city of Rome is founded.
- 509 BC - Rome becomes a republic.
- 218 BC - Hannibal invades Italy.
- 73 BC - Spartacus the gladiator leads the slaves in an uprising.
- 50 BC - Varro devises his Anno Urbis Conditae (AUC) dating system
- 45 BC - Julius Caesar becomes the first dictator of Rome.
- 44 BC - Julius Caesar is assassinated on the Ides of March by Marcus Brutus.
- 27 BC - The Roman Empire begins as Caesar Augustus becomes the first Roman Emperor.
- 64 AD - Much of Rome burns. Legend has it that Emperor Nero watched the city burn while playing a lyre.
In 525AD (1260AUC), Dionysius Exiguus, Roman monk, during the reign of Charlemagne (742-814), introduced the BC/AC dating system, aka Dionysian calendar, usurped the previous AUC dating system, with a “from empire [of Rome] founding” dated dating, according to him to have begun at the approximate mid-point (6.5 BC) of the reign of Caesar Augustus, from 27 BC-14 AD, but overtly themed it as a “birth of Christ” dating system, to align with the then-established Christianity form of the state religion.
While Caesar Augustus did exist as a real person, and the Roman empire did start with the start of his reign, there was, however, no "Christ" that existed. Hence, the BC/AD dating system is incorrigible.
In the 14th century, thinkers began to have doubts about the BC/AD dating system; to cite one example:
- “Written in the land of the living; on the right bank of the Adige, in Verona, in the year of that god whom you never knew the 1345th.”
In 1802, Thomas Paine, in his Painean calendar notation system, originated the BCM/ACM dating notation system, when he began to date his letters of communication, referring to 0AD specifically as a “mythical” date:
- “Paris, February 21st, 1802, since the fable of Christ”
- — Thomas Paine (1802), “Letter to Elihu Palmer”, signature and dating method 
In 2018, Libb Thims, inspired by the so-called Paine dating system, in some Hmolpedia articles began employing the ACM/BCM dating system notation, as opposed to the so-called vulgar BCM/CE scheme (Kepler, c.1610).
On 25 Apr 2020, at 10:30PM CST, Libb Thims, while drafting his HCT treatise, with the pressing need to have the title page dated and referenced to a scientific time-based point of reality, invented or devised the "before elements" / "after elements" (BE/AE), and shortly thereafter began using a dual-dating system for all of main existographies in Hmolpedia and as well as the big names in the top 2000 geniuses and minds rankings.
The following are related quotes:
- “The fact that we still categorized years in BC/AD dating system, indicates that we are still a backwards people.”
- — Libb Thims (2018), mental note; arisen will editing the Murray 4000 page, 7:40PM CST Jan 1
- Thims, Libb. (2020). Human Chemical Thermodynamics — Chemical Thermodynamics Applied to the Humanities: Meaning, Morality, Purpose; Sociology, Economics, Ecology; History, Philosophy, Government, Anthropology, Politics, Business, Jurisprudence; Religion, Relationships, Warfare, and Love (§I.4: Atomic Dating System (1955)) (pdf). Publisher.
- Ancient Rome timeline – Ducksters.com.
- Hecht, Jennifer M. (2003). Doubt: A History: The Great Doubters and Their Legacy of Innovation from Socrates and Jesus to Thomas (Cicero letter, pg. 262; year of that god, pg. 269). HarperOne.
- (a) Haught, James A. (1996). 2000 Years of Disbelief: Famous People with the Courage to Doubt (pg. 88). Prometheus.
(b) Conway, Moncure D. (date). The Life of Thomas Paine (pg. #). Publisher.
- Paine dating system – Hmolpedia.
- ACM – Hmolpedia.