CODEWITHSUNDEEP
clojurefunctional-programming
Robin
Robin

Reputation: 93

Add days to current date

Am new to clojure, can anyone help me to understand how can I get current date in clojure and then adding days to it? for e.g. adding 3 days to current date?

Upvotes: 9

Views: 1611

Answers (3)

Matt Innes
Matt Innes

Reputation: 2191

The idiomatic Clojure way is to use clj-time (see link for Leiningen/Maven install instructions), which wraps Joda time as referenced by the first answer from overthink.

user=> (use '[clj-time.core])
nil
user=> (now)
#<DateTime 2014-11-25T12:03:34.714Z>
user=> (plus (now) (days 3))
#<DateTime 2014-11-28T12:05:40.888Z>

Upvotes: 7

runexec
runexec

Reputation: 862

user> (import '[java.util Calendar])
;=> java.util.Calendar
user> (defn days-later [n]
        (let [today (Calendar/getInstance)]
          (doto today
            (.add Calendar/DATE n)
            .toString)))
#'user/days-later
user> (println "Tomorrow: " (days-later 1))
;=> Tomorrow:  #inst "2014-11-26T15:36:31.901+09:00"
;=> nil
user> (println "7 Days from now: " (days-later 7))
;=> 7 Days from now:  #inst "2014-12-02T15:36:44.785+09:00"
;=> nil

Upvotes: 1

overthink
overthink

Reputation: 24443

This isn't a Clojure-specific answer, really, but I'd use Joda time.

(import 'org.joda.time.DateTime)
(let [now (DateTime/now) 
      later (.plusDays now 3)] 
  [now later])

;; [#<DateTime 2014-11-24T23:26:05.885-05:00> #<DateTime 2014-11-27T23:26:05.885-05:00>]

Upvotes: 5

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