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The basic approach of nearly all of the methods to calculate the day of the week begins by starting from an "anchor date": a known pair (such as 1 January 1800 as a Wednesday), determining the number of days between the known day and the day that you are trying to determine, and using arithmetic modulo 7 to find a new numerical day of the week.
A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics. Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details).
Dates are given using the system of the Roman calendar, as well as the day of the lunar month. As a moveable feast, [1] [2] the date of Easter is determined in each year through a calculation known as computus paschalis (Latin for 'computation') – often simply Computus – or as paschalion particularly in the Orthodox church. [3]
The doomsday's anchor day calculation is effectively calculating the number of days between any given date in the base year and the same date in the current year, then taking the remainder modulo 7. When both dates come after the leap day (if any), the difference is just 365y + y / 4 (rounded down). But 365 equals 52 × 7 + 1, so after ...
The Julian date (JD) of any instant is the Julian day number plus the fraction of a day since the preceding noon in Universal Time. Julian dates are expressed as a Julian day number with a decimal fraction added. [8] For example, the Julian Date for 00:30:00.0 UT January 1, 2013, is 2 456 293.520 833. [9]
Starting date for the accrual. It is usually the coupon payment date preceding Date2. Date2 (Y2.M2.D2) Date through which interest is being accrued. You could word this as the "to" date, with Date1 as the "from" date. For a bond trade, it is the settlement date of the trade. Date3 (Y3.M3.D3) Is the next coupon payment date, usually it is close ...
If the delivery date is a non-business day or a US holiday, move forward until an acceptable delivery date is found. Finally, calculate the expiry date using an "inverse spot" operation; e.g., find the expiry date for which the delivery date would be its spot.
A stardate is a fictional system of time measurement developed for the television and film series Star Trek.In the series, use of this date system is commonly heard at the beginning of a voice-over log entry, such as "Captain's log, stardate 41153.7.