civil_julian

Description

civil_julian converts a provided Civil date into an Julian date. It works for both the Gregorian calendar and the Julian calendar, meaning that a civil date from before the Gregorian calendar was introduced, is simply returned.

Gory details

The function presented here is just one example of an algorithm to convert a date from one calendar top another, using the Julian Day Number (jdn). It starts by calling civil_jdn, to calculate the Julian day number for the provided civil date. From this Julian day number, the Julian year, month and day are derived, by calling jdn_julian.

Code section

Sub civil_julian(ByRef iYear As Integer, _
                      ByRef iMonth As Integer, _
                      ByRef iDay As Integer)
    Call jdn_julian(civil_jdn(iYear, _
                              iMonth, _
                              iDay), _
                    iYear, iMonth, iDay)
End Sub

See also

civil_jdn, jdn_julian, julian_civil

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