deps.edn: {:deps {clj-time {:mvn/version "0.15.2"}}} project.clj: (defproject my-project "0.1.0-SNAPSHOT" :dependencies [[clj-time "0.15.2"]]) clojure (require '[clj-time.core :as time]) (def seven-days (time/days 7)) (def specific-date (time/date-time 2022 1 1)) (time/plus specific-date seven-days) clojure (require '[clj-time.core :as time]) (def specific-time (time/date-time 2022 1 1 12 0 0)) (time/format specific-time "yyyy-MM-dd HH:mm:ss") (time/format specific-time "dd-MMM-yyyy HH:mm:ss") clojure (require '[clj-time.core :as time]) (def start-date (time/date-time 2022 1 1)) (def end-date (time/date-time 2022 1 10)) (def interval (time/interval start-date end-date)) (time/in-days interval) (time/in-hours interval)