The previous Hexbear Revolutionary Calendar is gone, along with the account that posted it; clearly, it is proof that it was not good enough. Below is the TRUE Hexbear Revolutionary Calendar (HRC).
Spoiler
It is almost the exact same, I just didn't remember some details. Also I'm hijacking this out-of-character part of the post to say I'm sorry for the puns.
:
The HRC starts on 29 June in the old calendar, as this is the day that r/chapotraphouse was banned. All months are 30 days long, and there is a 5-6 day period between the end of the last month and the start of the new year. Rhyming months indicate the season.
The months are as follows (with the equivalent in the old calendar in parentheses):
- Chapodor (29 June to 28 July)
- Icepickdor (29 July to 27 August)
- Hodor (28 August to 26 September)
- Hexbaire (27 September to 26 October)
- Octobaire (27 October to 25 November)
- Stalinaire (26 November to 25 December)
- Maoôse (26 December to 24 January)
- Beanôse (25 January to 23 February)
- Luxemburgôse (24 February to 24/25 March)
- Leninal (25/26 March to 23/24 April)
- Marxal (24/25 April to 23/24 May)
- Cheal (24/25 May to 22/23 June)
Spoiler 2: Month names boogaloo
Some of the months are named to reflect what happened in this month (the banning of the sub; the births of Stalin, Mao and other figures; the deaths of Rosa Luxemburg and Ho Chi Minh; the 
-ing of Trotsky; the October Revolution…). Others aren't. Don't look into it too much.
Five-to-six additional days are added, representing AES:
- China Day (23/24 June)
- Cuba Day (24/25 June)
- Korea Day (25/26 June)
- Laos Day (26/27 June)
- Vietnam Day (27/28 June)
- Past and Future Socialist Experiments Day (28 June every four years)
Today is 27 Stalinaire, Year 5.