Maxim V. Kollegov's VMaxCalendar Applet
The Perpetual Calendar
With this applet you can enter a year (in the upper white field) and convert Julian calendar dates to Gregorian calendar dates and vice versa choosing the Julian or Gregorian calendar in the second menu field ("menu for countries"). In this field you can also choose a specific country/area to see its dates from the Julian period, the shift to the Gregorian period and up to date. If you choose a country/area its first Gregorian date is shown: "yyyy.mm.dd" after the name of that country/area. If the first Gregorian date is shown as e.g. "584.06.??" I don't know the exact reform date for sure. The first Gregorian date is then listed as the earlist day in that month/year.
In the menu for countries which used other calendar systems prior to the adopting of the Gregorian calendar the special note "From: yyyy.mm.dd" is shown. Prior to that date the calendar show non exsisting Julian days. I only list countries where I "know" the change over dates. Finally e.g. "(D)" refer to that this area/town (whatever) is listed in the Scheme 1.1-1.3 under Germany. All dates of are taken from Scheme 1.1-1.3 in my "Perpetual Calendar" For countries with "more" change over dates listed - see the comments to these in Scheme 1.1-1.3.
The abbriviations used after some names in the "menu for countries" means Adi=Archdiocese of, Di=Diocese of, Du=Duchy of, GDu=Grand Duchy of, Ma= Margraviate of, Princ=Principality of, Prot=Protestant and Up=Upper.
The applet can only be used for the Julian/Gregorian calendar systems and assumes that New Year starts on 1 January. Furthermore please don't use the applet for years before 1 AD as the Julian Day numbers are incorrect and as it is only prepared for the normal Julian leap year rule that state that every year divisible by 4 is a leap year. But the applet has not been prepared for the following:
However, this rule was not followed in the first years after the introduction of the Julian calendar in 45 BC. Due to a counting error, every 3rd year was a leap year in the first years of this calendar's existence. The leap years were: 45 BC(?), 42 BC, 39 BC, 36 BC, 33 BC, 30 BC, 27 BC, 24 BC, 21 BC, 18 BC, 15 BC, 12 BC, 9 BC, AD 8, AD 12, and every 4th year from then on. Authories disagree about whether 45 BC was a leap year or not. There were no leap years between 9 BC and AD 8 (or, according to some authorities, between 12 BC and AD 4). This period without leap years was decreed by emperor Augustus in order to make up for the surplus of leap years introduced previously, and it earned him a place in the calendar as the 8th month was named after him. (w1)
- but if you have problems analyzing postmarks from that time, I'll be happy if you'll let me know!
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