New Calendars [solved]

Hello

I would like to propose the addition of some calendars to the database, which would be very helpful for Ancient coins. Here is an example of a dated ancient coin:
https://en.numista.com/catalogue/pieces186857.html

I will group them into three categories:

a. Generic eras
Seleucid era year 1 = 312/311 BC
Bithynian era year 1 = 297/296 BC
Soter era year 1 = 262/261 BC
Phoenician era year 1 = 259/258 BC
Arsakid / Parthian era year 1 = 247/246 BC
Armenian era year 1 = 110/109 BC
Pompeian era year 1 = 64/63 BC
Caesarean era year 1 = 49/48 BC
Es-Safar / Spanish era year 1 = 38/37 BC
Actian era year 1 = 31/30 BC

b. Local eras (used by one city-state or sometimes by its neighbours or by an entire region)
Aegospotami era year 1 = 9/8 BC
Alabanda era year 1 = 167/166 BC
Alexandria Troas era year 1 = 300 BC
Anazarbus era year 1 = 70 BC
Ashkelon era year 1 = 104/103 BC
Aspendos era year 1 = 212/211 BC
Caesarean era of Aigeae year 1 = 47/46 BC
Caesarean era of Laodicea year 1 = 48/47 BC
Demetrias era year 1 = 63/62 BC
Ephesus era year 1 = 134/133 BC
Eusebia era year 1 = 34/33 BC
Gaba era year 1 = 60/59 BC
Isinda era year 1 = 25/24 BC
Korone era year 1 = before 184 BC
Laodicea era year 1 = 81/80 BC
Magydus era year 1 = 214/213 BC
Marisa era year 1 = 59/58 BC
Oenoanda era year 1 = 188/187 BC
Perga era year 1 = 221/220 BC
Pergamon era era year 1 = 89/88 BC
Phaselis era year 1 = 218/217 BC
Pompeian era of Gaza year 1 = 61/60 BC
Samos era year 1 = 454/453 BC
Seleucia era year 1 = 109/108 BC
Sidon pre-Alexander era year 1 = 333/332 BC
Sidon post-Alexander era year 1 = 111/110 BC
Sillyon era year 1 = 221/220 BC
Sinope era year 1 = 46/45 BC
Termessos era year 1 = 71/70 BC
Thessalonica era year 1 = 42/41 BC
Tripoli Era era year 1 = 105/104 BC
Tyre era year 1 = 126/125 BC
Viminacium era year 1 = 239 AD
Zankle era year 1 = 494/493 BC

c. Regnal eras (based usually on the accession date of a ruler, and used during the reign of that ruler, but some were used posthumously as well)
Aradus - Gerashtart era year 1 = 340/339 BC
Armenia - Artavasdes II era year 1 = 55 BC
Bosporan Kingdom - Asander era year 1 = 47/46 BC
Cappadocia - Ariarathes V era year 1 = 163/162 BC
Cappadocia - Ariarathes VI era year 1 = 130/129 BC
Cappadocia - Ariarathes VII era year 1 = 116/115 BC
Cappadocia - Ariarathes VIII era year 1 = 101/100 BC
Cappadocia - Ariarathes IX era year 1 = 101/100 BC
Cappadocia - Ariobarzanes I era year 1 = 96/95 BC
Cappadocia - Ariobarzanes II era year 1 = 69/68 BC
Cappadocia - Ariobarzanes III era year 1 = 52/51 BC
Cappadocia - Ariarathes X era year 1 = 42/41 BC
Cappadocia - Archelaus era year 1 = 36/35 BC
Ephesus - Attalus II era year 1 = 159/158 BC
Ephesus - Attalus III era year 1 = 139 BC
Galatia - Amyntas era year 1 = 37/36 BC
Judea - Alexander Jannaeus era year 1 = 102/101 BC
Judea - Herod I era year 1 = 39/38 BC
Judea - Herod Antipas era year 1 = 4/3 BC
Kition - Pumiathon era year 1 = 371/370 BC
Nabataea - Obodas II era year 1 = 62/61 BC
Nabataea - Malichos era year 1 = 60/59 BC
Nabataea - Obodas III era year 1 = 30/29 BC
Nabataea - Aretas IV era year 1 = 9/8 BC
Nabataea - Malchios II era year 1 = 40/41 AD
Nabataea - Rabbel II era year 1 = 70/71 AD
Nicaea - Lysimachus era year 1 = 282/281 BC
Ptolemaic Kingdom - Ptolemy II era year 1 = 285/284 BC
Ptolemaic Kingdom - Ptolemy III era year 1 = 247/246 BC
Ptolemaic Kingdom - Ptolemy V era year 1 = 205/204 BC
Ptolemaic Kingdom - Ptolemy VI era year 1 = 181/180 BC
Ptolemaic Kingdom - Ptolemy VIII era year 1 = 170/169 BC
Ptolemaic Kingdom - Cleopatra III era year 1 = 117/116 BC
Ptolemaic Kingdom - Ptolemy X era year 1 = 114/113 BC
Ptolemaic Kingdom - Ptolemy XII era year 1 = 81/80 BC
Ptolemaic Kingdom - Cleopatra VII in Egypt era year 1 = 52/51 BC
Ptolemaic Kingdom - Cleopatra VII in Phoenicia era year 1 = 37/36 BC
Ptolemaic Kingdom - Ptolemy XV era year 1 = 37/36 BC
Rome - Julius Caesar era year 1 = 99/98 BC
Rome - Mark Anthony era year 1 = 82/81 BC
Seleucid Kingdom - Tryphon era year 1 = 142/141 BC
Sidon - Ba'al Sillem II era year 1 = 401/400 BC
Sidon - Abdashtart I era year 1 = 365/364 BC
Sidon - Mazaeus era year 1 = 353/352 BC
Sidon - Tennes era year 1 = 351/350 BC
Sidon - Evagoras II era year 1 = 346/345 BC
Sidon - Abdashtart II era year 1 = 341/341 BC
Tyre - Abdashtart of Tyre era year 1 = 393/392 BC
Tyre - Azemilcus era year 1 = 349/348 BC

I tried to keep it simple and not add too many details. If any supplementary info is required or different formatting, let me know. I also omitted some eras that appear on only two-three coins, the eras for which the start date is unknown, and the Alexandrine era(s) which I find a little confusing.

The correspondence to two years is because ancient calendars rarely began on 1 January. So for example: Year 1 Seleucid Era corresponds to September 312 BC to August 311 BC (312/311).

This info is not so easily accessible; this list was compiled mostly from HGCS, RPC, Cohen, Varbanov, Betlyon, and some other minor resources, focusing on BC calendars only. For AD calendars I haven't finished the research yet, will post it once I have a comprehensive overview.

I also have two related proposals.

1. We currently have:

Iranian - persian

This should probably be:

Iranian - Persian

2. Gregorian calendar is a bit misleading for me (I remember mentioning this somewhere before, but can't find the thread now)
For example, this coin from 1921 uses the Julian calendar, because Greece only adopted the Gregorian calendar in 1923 (many countries adopted it very late). At this point, I think there was a 13-day difference, so it's only a technicality, but maybe we can get this right.

I am not sure what the best solution for this problem is. Adding a Julian calendar could work, but it's a bit unnecessary. Maybe renaming it to "Gregorian/Julian"?

Quote: "stratocaster"​This should probably be:
​
​Iranian - Perisan

​You mean it should be "Iranian - Persian" I suppose?

yes, fixed it thank you

Hello,

All the calendars have been added and the name for the Persian calendar is fixed.

The topic about the inaccurate naming of the Gregorian calendar was previously discussed here: https://en.numista.com/forum/topic94060.html (still open because the ambiguity of the search field labels is not fixed)

I like the simple approach of renaming to “Gregorian/Julian” and I did so.

Thank you!

I saw that several calendars above are still not used, can we make sure at least one entry is added for each?

For instance aegospotami

 

Thanks!

Also are Bosporan and Bythinian eras the same ? (Cf the only example coin in the first post)