Theban Revolutionary Calendar

The Theban Revolutionary Calendar, known officially as the Calendar of the Free Commonwealth and colloquially as the Liberty Calendar, was a calendar created by the Theban Commonwealth and officially implemented in March 2499 of the Gregorian calendar, and continued use by 2560. 
Designed with the intention of removing the influence had on Theban society, it took deliberate inspiration from the similar French Republican calendar. It saw use throughout the Commonwealth and inspired separate but comparable calendars created in other states.
==Overview==
The calendar was implemented in March 2499 of the Gregorian calendar through popular support in the Theban Assembly. The design selected had been proposed by Assembly delegate Emanuil Antov, who had campaigned for the establishment of a new calendar since Thebes had declared its independence. The measure of one of many done in order to limit or remove the influence of Earth and certain elements of its culture on the former colony, alongside actions such as the ban of the UEG credit and the ban on the use of Latin phrases, words, or titles in public documents.
===Design===
The calendar takes clear inspiration from the French Republican calendar, particularly in its decimal-based structure, as well as the names of some of its months. However, the Theban calendar is in some ways more radical than its inspiration. It is based on a system of 10 months of 40 days, along with one day set aside to mark the transition between years, effectively making for a 401-day yearly calendar. The leap year is abandoned entirely. Unlike the French, the Thebans did not attempt to decimalise timekeeping, but instead used a slightly altered version of the previously used 26-hour Theban day. 
The beginning of the calendar was set at the official implementation of the Theban constitution, designated 1 Plasias, Year 1, equivalent to August 19, 2496, in the Gregorian calendar. Thus, the beginnings and ends of a Theban year are in the summer season. The day set aside to mark the transition between years is a national holiday, called Anamesas (from the Greek ανάμεσα, meaning "between"). For organisation, this day is attached to the last month of the previous year, making it the 401st day and making Nikos the only month with 41 days. 
===Months===
There are ten months in each Theban year, and are as follows, in order:
*Plasias (Formation)
*Sodeias (Vintage)
*Pagetos (Frost)
*Giortos (Holiday)
*Kionos (Snow)
*Tiksas (Thaw)
*Verokos (Rain)
*Anthos (Flower)
*Thermidos (Heat)
*Nikos (Victory)
===Weeks===
Unlike the Gregorian calendar, the ten days of the Theban week are not given unique names, but instead designated simply in numerical order. Some calendars do give them some kind of title, such as that used by the Theban Defence Forces, which designates them by their numerical order in Theban Slavonic. This system is also used in several Slavonic-speaking regions in the Commonwealth, and is as follows:
*Porvos (First)
*Vetoris (Second)
*Teretos (Third)
*Šetveris (Fourth)
*Pyatos (Fifth)
*Šestos (Sixth)
*Sedenos (Seventh)
*Osnis (Eighth)
*Nevetos (Ninth)
*Desetis (Tenth)
==Date Conversions==
The following are several important historical dates rendered in the Theban Calendar, as examples:
*Creation of Theban Commonwealth: 1 Plasias, 1 (August 19, 2496)
*Beginning of : 20 Nikos, 24 (February 11, 2525)
*Mutiny of 2530: 28 Plasias, 29 (January 7, 2530)
*: 4 Sodeias, 48 (August 30, 2552)
*End of Human-Covenant War: 19 Giortos, 48 (December 11, 2552)
*Beginning of : 26 Pagetos, 53 (October 17, 2558)
*Beginning of : 13 Pagetos, 54 (December 12, 2559)