Julian day to dates in YEAR-MONTH-DAY

Shell Programming and Scripting
1

hello,
I have many files called day001, day002, day003 and I want to rename them by day20070101, day20070102, etc.
I need to do it for several years and leap years as well.
What is the best way to do it ?
Thank you.

2

Look here:
http://www.unix.com/answers-frequently-asked-questions/13785-yesterdays-date-date-arithmetic.html

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