(defun is-century-year(year)

(if (= (mod year 100) 0)

t

nil))

(defun is-leap-year(year)

"leap year is century years divisible by 400,

not other century years, otherwise anything evenly

divisble by 4"

(if (is-century-year year)

(if (= 0 (mod year 400))

t

nil)

(if (= 0 (mod year 4))

t

nil)))

2018-07-23 Emacs news

6 hours ago

## 1 comment:

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