I'd say they are definitely idiomatic but they can be overused and sometimes it can be clearer to name parts of an expression via let rather than either of those two forms. If (fn1 foo) returns a pair (or a sequence) and you're ignoring the second (or all subsequent) element(s), it might be clearer to call that out in a let for example:

(let [[data & _] (fn1 foo)]
  (.getName (:bar data)))

These are both good reading: • https://stuartsierra.com/2018/07/06/threading-with-style • https://stuartsierra.com/2018/07/15/clojure-donts-thread-as

interesting point about destructuring to avoid first 👍

I think that threading macros should be preferred over nested calls. Specially if each step/function called are well named and therefore you end up with a smal “story” of what is happening to the data like so:

(-> data
    extract-date
    addDay
    to-date)

That is the kind of code I try to build every single time I use Clojure 😉

your function will only return the last expression evaluated. Which in your case is (str "Q")

You need something like

(defn svg2pdf [svg-root-element target-box]
  (str "q\n"
       "1 0 0 1 29.5 30.5 cm\n"
       "q\n"
       "Q\n"
       "Q"))

it is working fine in console log but when I am rendering it in [:p ] I am getting it in one line

(defn svg2pdf [svg-root-element target-box]
  (clojure.string/join "\n"
    ["q"
     "1 0 0 1 29.5 30.5 cm"
     "q"
     "Q"
     "Q"]))

@U02DQ45FQF9 Do you understand why your original solution didn't work?

@UEQPKG7HQ yeah now it makes sense

Clojure-strings can also be multi-line! But the other suggestions are better for preserve indentation:

(defn svg2pdf []
  (str "q
1 0 0 1 29.5 30.5 cm
q
Q
Q"))

(OffsetDateTime/of
  (LocalDateTime/parse
    "2022-03-31T21:35:35Z"
    (DateTimeFormatter/ofPattern "yyyy-MM-dd'T'HH:mm:ssz"))
  (ZoneOffset/of "-06:00"))

(let [in-df  (java.text.SimpleDateFormat. "yyyy-MM-dd'T'hh:mm:ss'Z'")
        out-df (java.text.SimpleDateFormat. "yyyy-MM-dd'T'hh:mm:ssZ")]
    (->> "2022-03-31T21:35:35Z"
         (.parse in-df)
         (.format out-df)))

Thank you my friends!

Im not sure if that’s what I needed. Because the result is always showing the same hour 21 and it should be 15

If you don't just want your local time and need to specify zone, then using my approach, you'd need to set the TZ on the out formatter. You'd be best served by using an official name for the TZ to create it, but this hard-coded -6 hours works:

(let [in-df  (doto (java.text.SimpleDateFormat. "yyyy-MM-dd'T'HH:mm:ss'Z'")
                 (.setTimeZone (java.util.TimeZone/getTimeZone "UTC")))
        out-df (doto (java.text.SimpleDateFormat. "yyyy-MM-dd'T'HH:mm:ssZ")
                 (.setTimeZone (java.util.TimeZone/getTimeZone (java.time.ZoneOffset/ofHours -6))))]
    (->> "2022-03-31T21:35:35Z"
         (.parse in-df)
         (.format out-df)))

Thanks @U01GXCWSRMW That works!

If I use (java.time.ZoneOffset/of zone-id) where zone-id is a string “-06:00” I’m getting the expected result.