Date conversion functions

All inputs for these functions and procedures can be arrays!

julian(year$<$_integer$>$,month$<$_integer$>$,day$<$_real$>$)

Function; returns Julian day including fraction. Day can be fractional. Example: print,julian(1998,12,16.2)

jd2date,jdf$<$_real$>$,year,month,day

Procedure; returns year, month, and day (including fraction) for input (fractional) Julian date.

by2jd(year$<$_real$>$)

Function; returns Julian date corrresponding to input Besselian year.

jy2jd(year$<$_real$>$)

Function; returns Julian date for input Julian year.

jd2jy(jd$<$_real$>$)

Function; returns Julian year for input Julian date.

jd2by(jd$<$_real$>$)

Function; returns Besselian year for input Julian date.