From 11341ac2c9c640f03d76462546b3d642e1e312f7 Mon Sep 17 00:00:00 2001
From: Henry Widd <henryw374@gmail.com>
Date: Wed, 20 Mar 2024 13:40:38 +0000
Subject: [PATCH] add instant->zdt-in-UTC

---
 README.md                               | 22 ++++++++++++++++++----
 gen_in/tempo.cljc                       |  4 ++++
 test/com/widdindustries/tempo_test.cljc |  9 ++++++---
 3 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/README.md b/README.md
index bef0d9c..078e87a 100644
--- a/README.md
+++ b/README.md
@@ -98,10 +98,21 @@ namespace exists which contains a subset of the functions from `tick.core` which
 
 [![Clojars Project](https://img.shields.io/clojars/v/com.widdindustries/time-literals-tempo.svg)](https://clojars.org/com.widdindustries/time-literals-tempo)
 
-* As of March 2024, a polyfill (e.g. [this](https://github.com/fullcalendar/temporal-polyfill)) of Temporal will be required for all javascript environments.
-* The new underlying Javascript platform time API [Temporal](https://github.com/tc39/proposal-temporal) has semi-stabilized at
+As of March 2024
+
+* [Temporal](https://github.com/tc39/proposal-temporal) has semi-stabilized at
   `ecma stage 3`, meaning implementors
-  can still suggest changes - although at this point any changes will be superficial.
+  can still suggest changes - although at this point any changes will be superficial. 
+* a polyfill (e.g. [this](https://github.com/fullcalendar/temporal-polyfill)) of Temporal will be required for all javascript environments.
+
+```html
+    <script>
+        if(!window.Temporal){
+          document.write('<script src="https://cdn.jsdelivr.net/npm/temporal-polyfill@0.2.3/global.min.js"><\/script>');         
+                  }
+    </script>
+```
+
 
 ### Setup
 
@@ -195,11 +206,14 @@ to as `timezone_id`. Call `str` on a timezone to get its id.
 (t/yearmonth+day-at-end-of-month a-yearmonth) ; => a date
 (t/datetime+timezone a-datetime "Pacific/Honolulu") ; => a zdt
 
-; to get parts of an entity, start with the subject and add ->
+; to get parts of an entity, the function name will start with the type of the entity, then add -> then put the target type. For example:
 (t/date->yearmonth a-date)
 (t/date->month a-date)
 (t/zdt->nanosecond a-zdt)
 (t/instant->epochmillisecond an-instant)
+(t/epochmilli->instant 123)
+(t/legacydate->instant d)
+; & etc
 
 ```
 
diff --git a/gen_in/tempo.cljc b/gen_in/tempo.cljc
index 80aa727..8758aa8 100644
--- a/gen_in/tempo.cljc
+++ b/gen_in/tempo.cljc
@@ -104,6 +104,10 @@
   #?(:cljay (.toInstant ^java.util.Date d)
      :cljs (.toTemporalInstant ^js d)))
 
+(defn instant->zdt-in-UTC [instant]
+  #?(:cljay (ZonedDateTime/ofInstant instant (ZoneId/of "UTC"))
+     :cljs (.toZonedDateTimeISO ^js instant "UTC")))
+
 (defn greater [x y]
   (if (neg? (compare x y)) y x))
 
diff --git a/test/com/widdindustries/tempo_test.cljc b/test/com/widdindustries/tempo_test.cljc
index 7609829..fee8b42 100644
--- a/test/com/widdindustries/tempo_test.cljc
+++ b/test/com/widdindustries/tempo_test.cljc
@@ -80,9 +80,12 @@
         (is (= i (t/instant-from {:epochmilli (t/instant->epochmilli i)}))))
       (let [d #?(:clj (Date.) :cljs (js/Date.))
             i (t/instant-from {:legacydate d})]
-        (= (.getTime d) (t/instant->epochmilli i))
-        (is (= (.getTime d) (->  (.getTime d) (t/epochmilli->instant) (t/instant->epochmilli))))
-        ))
+        (is (= (.getTime d) (t/instant->epochmilli i)))
+        (is (= i (-> i (t/instant->legacydate) (t/legacydate->instant))))
+        (is (= (.getTime d) (->  (.getTime d) (t/epochmilli->instant) (t/instant->epochmilli))))))
+    (testing "zdt-instant"
+      (let [i (t/instant-parse "2024-01-16T12:43:44.196000Z")]
+        (is (= i (-> i (t/instant->zdt-in-UTC) (t/zdt->instant))))))
     (testing "zdt with offset"
       (is (= "+05:50"
             (->