I just started to play with wit/duckling. It is written in Clojure and I have no previous experience in Clojure. I need to parse a string like 2016-08-14T19:45:48.000+05:30 to a format like 1945hrs, Sunday, August 14th 2016. I searched on Internet and came across to lib clj-time. After struggling with it for a long time I came across this thread and thought that rfc822 is my cup of tea. So I used formatter rfc822 but it is giving me exception:
java.lang.IllegalArgumentException: Invalid format: "2016-08-16T00:00:00.000+05:30"
Here is my code:
(ns firstproj.core
(:gen-class)
(:require [duckling.core :as p])
(:require [clj-time.format :as f]))
(defn -main
"I don't do a whole lot."
[x]
(p/load! { :languages ["en"]})
(def var_ (p/parse :en$core x [:time]))
(def date_string "2016-08-14T19:45:48.000+05:30")
(f/parse (f/formatters :rfc822) date_string))
So can anybody tell me what I am doing wrong here. Or any other way in Clojure to get my desired date-time format. As I am completely naive in Clojure, I request you to answer in detail, it will help me to understand this in a better way. Thank You.
Without actually checking which predefined formatter matches your date format you might just call:
(f/parse "2016-08-14T19:45:48.000+05:30")
;; => #object[org.joda.time.DateTime 0x1bd11b14 "2016-08-14T14:15:48.000Z"]
It will try all predefined formatters and return parsed value from the first one that succeeds.
Then to print in your custom format:
(require '[clj-time.core :as t])
(def my-time-zone (t/time-zone-for-offset 5 30))
(def my-formatter
(f/formatter
"HHmm'hrs', EEEE, MMMM dd yyyy"
my-time-zone))
(f/unparse my-formatter some-date)
;; => "1945hrs, Sunday, August 14 2016"
Unfortunately to my knowledge JodaTime doesn't handle things like adding st, nd, rd, th to days.