Description
A new format specifier for the day of the year (1-365). This would be very useful to use instead of using month+day of the month. It's shorter most of the time throughout the year and so it's easier to read at a glance.

Specification and constraints
I've seen some programs use j as the variable for the day of the year but I don't know if that's a common standard.
Also would prefer if there was no leading zeros on single and double digits, but I suppose two versions could be made if desired.

Thanks for the useful program!