clojure - best way to increase date by x days -

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i need read in date string in yyyymmdd format , increase x amount of days - @ minute doing converting millis , adding 1 day in mills converting yyyymmdd.

(.print   (.withzone    (datetimeformat/forpattern "yyyymmdd") (datetimezone/forid "est"))  (+ 86400000 (.parsemillis    (.withzone (datetimeformat/forpattern "yyyymmdd")   (datetimezone/forid "est")) "20150401")))

is there cleaner way this? clj-time library not available me, , using clojure 1.2

since cant't use clj-time, best option in case, can't think of better using org.joda.time did.

however, suggest rewriting code little bit:

  • there no need time zones here;
  • you create datetimeformat object once , reuse it.

here how function look:

(defn add [date pattern days]   (let [fmt (datetimeformat/forpattern pattern)         add (* 86400000 days)]     (->>  date           (.parsemillis fmt)           (+ add)           (.print fmt))))  (add "20150401" "yyyymmdd" 1) ; => "20150402"

if don't want work milliseconds, use .parsedatetime instead of .parsemillis , .plusdays method add days parsed date:

(defn add [date pattern days]   (let [fmt (datetimeformat/forpattern pattern)         dt  (.parsedatetime fmt date)]     (.print fmt (.plusdays dt days))))

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