##Usage
import "github.com/ottojo/GoCalendar"
day, month, year := GoCalendar.GregorianToJulian(15, 07, 1337);
println("Date in julian calendar: " +
strconv.Itoa(day) + "." +
strconv.Itoa(month) + "." +
strconv.Itoa(year));
day, month, year = GoCalendar.AddDays(day, month, year, 5, "j"); //"j" - Julian calendar, "g" - Gregorian calendar
println("5 days later: : " +
strconv.Itoa(day) + "." +
strconv.Itoa(month) + "." +
strconv.Itoa(year));