Small typos in Roman calendar

[Atque]

While simulating the sky on the day of Caesar's assassination (15 March 44 BC), I noticed that the Calendar plugin outputs "Ides Martii", while correct Latin would be "Idus Martii Martiae".
https://en.wiktionary.org/wiki/idus#Latin

Also, since Idus is a feminine plurale tantum, other months should be feminine plural (Ianuariae, Februariae, Maiae, Iuniae, Iuliae, Augustae). Aprilis, Septembris, Octobris, Novembris and Decembris seems fine, since already in antiquity they seem to have preferred the singular form.

https://en.wiktionary.org/wiki/October#Latin

The accusative plural adjective forms Aprīlīs, Septembrīs, Octōbrīs, Novembrīs, Decembrīs[2] are ambiguous in writing, being spelled identically to the genitive singular forms of the nouns; nevertheless, the use of ablative singular forms in -ī and comparison with the usage of other month names as adjectives supports the interpretation of -is as an accusative plural adjective ending in Classical Latin phrases such as "kalendas Septembris".[3]

[gzotti]

Sure! Thanks.

[Atque]

Ok, upon consulting my Latin textbook, it should even be "Idus Martiae".

Very likely the other months should also be feminine (Ianuariae, Februariae, Maiae, Iuliae).

[10110111]

According to Wikipedia,

Latin: Idus Martiae, Medieval Latin: Idus Martii

So this depends on what kind of Latin you want to use.

[Atque]

According to Wikipedia,

Latin: Idus Martiae, Medieval Latin: Idus Martii

So this depends on what kind of Latin you want to use.

I cannot think of a reason to use Medieval Latin when using the ancient Roman calendar.

[gzotti]

My intention was Idus Martii, given that historians (and probably my calendar sourcebook) must have used it. If some other source than WP (e.g. Ginzel 1906) has Martiae, I will change it. (But no, not another flag...)

[Atque]

My intention was Idus Martii, given that historians (and probably my calendar sourcebook) must have used it. If some other source than WP (e.g. Ginzel 1906) has Martiae, I will change it. (But no, not another flag...)

Well, Suetonius writes it:
https://www.thelatinlibrary.com/suetonius/suet.caesar.html

Dein pluribus hostiis caesis, cum litare non posset, introiit curiam spreta religione Spurinnamque irridens et ut falsum arguens, quod sine ulla sua noxa Idus Martiae adessent:

[gzotti]

If Martius is just an adjective, Idus Martiae is understandable. For the other months I leave it as is.