I never understood why Nim doesn't allow this.
If you want to keep the same name and use overloading, one option is to use a
_var_ argument instead of return. This works:
proc myBirthday(n: var int) =
n = 372297600
proc myBirthday(s: var string) =
s = "October 19, 1981"
var s : string; myBirthday s
var n : int; myBirthday n
echo "Human Date: ", s
echo "Unix Time: ", n
