/usr/src/perl/pod/perlfaq4/How_can_I_find_the_Julian_Day_.pod

How can I find the Julian Day?

Neither Date::Manip nor Date::DateCalc deal with Julian days. Instead, is an example of Julian date calculation in CPAN/authors/David_Muir_Sharnoff/modules/Time/JulianDay.pm.gz, which should help.