Gregorian to Julian Date conversion

[Guest]

Is there a class that converts from Gregorian date to TRUE Julian Date in
..NET? Any VB.NET examples available?

ie;
The Julian date is calculated by the number of days since January 1, 4713
BC. For example, the Julian date for August 1, 2001 is 2452122.

 

[Ken Cox [Microsoft MVP]]

Hi Chris,

There's some code on this page that seems to convert a Gregorian date to a
Julian date. Perhaps that will get you started?

http://msdn.microsoft.com/library/e...ianCalendarClassAddMonthsTopic.asp?frame=true

 

[Guest]

I've already been to that page in the msdn, but it does not have a method for
getting the "TRUE" julian date. Seems like there would be a method that does
this rather than reinventing the wheel. How can I convert Gregorian to TRUE
julian date?

ie;
The TRUE Julian date is calculated by the number of days since January 1,
4713
BC. For example, the Julian date for August 1, 2001 is 2452122.

 

[Mark Rae]

public double GetJulianDate(DateTime pdtmDate)
{
DateTime dtmStart = new DateTime(1,1,1);
TimeSpan objTS = new TimeSpan(pdtmDate.Ticks - dtmStart.Ticks);
return objTS.TotalDays + 1721637;
}