Add unixtimestamp32 to standard lib

common/changes/@typespec/compiler/add-unixtimestamp32_2023-10-17-19-30.json

@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@typespec/compiler",
+      "comment": "Add new `unixTimestamp32` scalar to standard library",
+      "type": "none"
+    }
+  ],
+  "packageName": "@typespec/compiler"
+}

docs/standard-library/built-in-data-types.md

@@ -394,6 +394,17 @@ scalar uint8
 
 
 
+### `unixTimestamp32` {#unixTimestamp32}
+
+Represent a 32-bit unix timestamp datetime with 1s of granularity.
+It measures time by the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970.
+
+```typespec
+scalar unixTimestamp32
+```
+
+
+
 ### `url` {#url}
 
 Represent a URL string as described by https://url.spec.whatwg.org/

packages/compiler/lib/lib.tsp

@@ -120,6 +120,14 @@ scalar duration;
  */
 scalar boolean;
 
+/**
+ * Represent a 32-bit unix timestamp datetime with 1s of granularity.
+ * It measures time by the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970.
+ *
+ */
+@encode("unixTimestamp", int32)
+scalar unixTimestamp32 extends utcDateTime;
+
 /**
  * Represent a model
  */