Get yesterday's date in Clojure

Question

I need to get yesterday's date (not user-based, but relative to the server) in the format YYYY-MM-DD.

What is the best way to achieve this in Clojure?

Answer 1

With Java 8 Time API:

(import (java.time LocalDate)
        (java.time.format DateTimeFormatter))

(def formatter (DateTimeFormatter/ofPattern "yyyy-MM-dd"))

(def yesterday (.minusDays (LocalDate/now) 1))

(.format formatter yesterday)
;; => "2017-04-05"

Or with Java 8 Time API Clojure wrapper: clojure.java-time

(require '[java-time :as t])

(def yesterday (t/minus (t/local-date)
                        (t/days 1)))

(t/format "yyyy-MM-dd" yesterday)
;; => "2017-04-05"

Answer 2

clj-time

(t/minus (t/now) (t/days 1))