Cilsurian Calendar
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The Cilsurian Calendar is, together with the Gregorian Calendar, the official calendar of Cilsur. The Cilsurian Calendar is one of the most accurate calendars in existence, although being so accurate it is more sensitive to natural calendar changes.
Date writing
Initially the Cilsurian and Gregorian calendars should be synchronized to the same day. But due to various measurement differences, the date of the Cilsurian calendar is one day ahead of the Gregorian calendar.
To mark the difference between the two calendars, the Cilsurian calendar ALWAYS has a C added in front of the dates. For example, February 25 in the Gregorian calendar is February C26 in the Cilsurian calendar, especially used in the abbreviations: 25/02/2023 (Gregorian calendar), C02/26/2023 (Cilsurian calendar). Normally the date goes "C"dd/mm/yyyy.
Difference
Rule of duration of years
The only thing that changes with respect to the Gregorian calendar is actually the number of days of the years, since the Cilsurian leap years work as follows:
Years multiples of 4 are leap years, but of the years multiples of 100 only those multiples of 400 will be leap years and double leap years if they are multiples of 5000. So it can celebrate its birthday.
Double leap years ("trisiestos" in Spanish) have February 30, being unique, if a person is born on this day, he/she will be considered born on February 28, 29 or March 1.
Years
The enumeration of the years is the same, but ECB and CE are used to mark the days, since it is known that the date of Jesus' birth was miscalculated. In addition, the Cilsurian calendar has no dates of the period before 1 CE.
Months and days
The months are the same: January, February, March, April, May, June, July, August, September, October, November, December.
Days last 24 hours (hours last 60 minutes, minutes last 60 seconds and seconds last 100 hundredths), although days actually last 23 hours, 56 minutes and 4 seconds, the daily change is really negligible.
"November has 30 days, With April, June and September, The rest has 31, Except February, which is 28, Leap 29, Double Leap 30."