Julian date software

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Surgeon Simulator Free. Allow you to perform a live saving operation on your Windows PC. This article discusses calendrical software of the first kind only. The obvious way to classify calendrical software of this kind is in terms of the calendars that it deals with. Some software, of course, handles dates in more than one calendar, so in what follows there is some duplication. In each of the sections below a distinction is made between software which is written for the PC, the Macintosh, some other system, or whether the software is a web application.

Some of this software is free and some is try-before-you-buy the name of the software publisher is usually given after the title. There are a couple of additional sections not concerned with specific calendars, such as astronomical software of relevance to calendrical studies. This software by Hermetic Systems is for converting dates in the Common Era a. The basic operations are the addition or subtraction of a number of days to or from a date, and the subtraction of one date from another resulting in the number of days between two dates.

Some software allows the option of including or excluding the first date, and of excluding weekend days from the calculations. The Chinese calendar is a lunisolar calendar whose months begin on the day of the dark moon, and whose years usually have 12 months but sometimes 13 approximately every third year. All or almost all calendar software intended for users in the West convert dates in some calendar to or from CE dates.

Only the following kinds of software might be expected not to support conversion of CE dates: a Software intended for local use in a non-Western society. The Hermetic Leap Week Calendar has years which consist of exactly 52 or 53 7-day weeks, and 12 months each of 4 or 5 weeks. The northern winter solstice almost always occurs in the last week of the year. The Hermetic Lunar Week Calendar specifies days by means of dates of the form year-month-week-day , where a year has 12 or 13 months, a month has exactly four weeks, and a week consists usually of 7 or 8 days but sometimes of 6 or 9 days.

Weeks track the lunar quarters exactly. The ISO Week Calendar is a leap week calendar that is used mainly in government and business for fiscal years. It uses the conventional 7-day week, with weeks starting on Monday. Years begin within 3 days of the start of the Common Era Calendar year, and each year has exactly 52 or 53 weeks. In CE it was reformed to produce the Gregorian calendar. It is still used by the Russian Orthodox Church.

The Julian day number system is not itself a calendar, but is of central importance in the study of calendars. This system sets up a one-to-one correspondence between days more exactly nychthemerons as observed on Earth and the integers This allows identification of a particular day without reference to any particular calendar.

Most conversions of dates in two different calendars do this by converting dates in those calendars to or from Julian day numbers. The Kalacakra Calendar is a lunisolar calendarin which days are numbered according to the Moon's longitude. The Liberalia Triday Calendar combines a solar calendar with a lunar calendar which have 'tridays' periods of 3 days in common. The Maya used at least three different calendrical systems and some variations within the systems. The three systems are known as the tzolkin , the haab and the long count.