result = linux2jd(linuxTime)
Convert linux time (the number of seconds since UTC Jan 1 1970) to julian date (the number of days since Jan 1 4713 BC).
The julian date, in days
March 2009 Written by Chris Beaumont April 8 2009: Fixed bug which treated j2000 as j2001
|Modifcation date:||Mon Mar 22 16:17:13 2010|