hirondelle.formula.function.builtin
Class ModifiedJulianDate

Object
  hirondelle.formula.function.builtin.ModifiedJulianDate

All Implemented Interfaces:

Function

public final class ModifiedJulianDate
extends Object
implements Function

mjd(year, month, day): the Modified Julian Date of a calendar date.

The Julian Date is defined by astronomers as a simple sequential date reckoning. Its primary use is to make it simple to calculate the number of days between two dates in the Gregorian calendar.

Since the origin of the Julian Date is in the distant past, it takes on large values for modern dates. The Modified Julian Date merely changes day 0, in order to result in smaller values for modern dates.

Constructor Summary

ModifiedJulianDate()

Method Summary

Decimal

calculate(Decimal... aArgs) Takes 3 parameters for year, month, and day.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ModifiedJulianDate

public ModifiedJulianDate()

Method Detail

calculate

public Decimal calculate(Decimal... aArgs)

Takes 3 parameters for year, month, and day.

The day may contain a fraction. Uses Check.date(Decimal, Decimal, Decimal).

Specified by:

calculate in interface Function

Parameters:

aArgs - 0 or more arguments to the function.