In dating systems, Painean calendar (LH:11) refers to the dating of standard Dionysian calendar based years, i.e. BC/AD, as being explicitly myth-based, i.e. a Christ (C) Myth (M) based calendar dating system, using the notation: "Before Christ Myth" (BCM), instead of "Before Christ" (BC), and "After Christ Myth" (ACM), instead of "Anno Domini" (AD). The system was employed by Thomas Paine in his 1802 letters of correspondence, and adopted by Libb Thims, in 2018, for use in Hmolpedia existography datings.
In 1345, Petrarch began to date his letters as the year “1345 of the year of the god who you never knew”, for 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 the wake of publishing The Age of Reason (1794), the most-widely cited “atheist's bible”, historically, began to date his letters of correspondence, irreverently, or rather myth-explicit, as years since the start of the fable of Christ; for example:
- “Paris, February 21st, 1802, since the fable of Christ”
In 2018, Libb Thims, inspired by this so-called "Paine dating system", in some Hmolpedia articles, began employ an "After Christ Myth" (ACM) / Before Christ Myth" (BCM) notational usage, in place of the standard Dionysian calendar BC/AD (or BCE/ACE) date notations.
In 2020, Thims, having become comfortable with the Paine calendar, but in need of a more exact upgrade, introduced the Thimsian calendar, dating years to the zero year of the 1955, when a human first saw atoms, specifically when Erwin Muller, on 11 Oct 1955, saw tungsten atoms, with his own eyes, via his newly invented field ion microscope, therein subsuming and upgrading the Painean calendar, simultaneously.
- Paine, Thomas. (1795). The Age of Reason (editor: Moncure Conway) (txt). Merchant Books, 1896.
- 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 2020.