Add a test application that demonstrates chrono and timezone processing

Cargo.lock

@@ -4202,6 +4202,14 @@ dependencies = [
  "time-core",
 ]
 
+[[package]]
+name = "timezone-testing"
+version = "0.1.0"
+dependencies = [
+ "chrono",
+ "chrono-tz",
+]
+
 [[package]]
 name = "tinystr"
 version = "0.7.5"

Cargo.toml

@@ -25,6 +25,7 @@ members = [
     "result-extended",
     "screenplay",
     "sgf",
+    "timezone-testing",
     "tree",
     "visions/server",
 ]

timezone-testing/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "timezone-testing"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+chrono = "0.4.31"
+chrono-tz = "0.8.4"

timezone-testing/src/lib.rs

@@ -0,0 +1,52 @@
+#[cfg(test)]
+mod tests {
+    use chrono::{DateTime, FixedOffset, NaiveDate, TimeZone};
+    use chrono_tz::{
+        America::{New_York, Phoenix},
+        Tz,
+        US::Mountain,
+    };
+
+    #[test]
+    fn it_saves_with_offset() {
+        let date = Phoenix.with_ymd_and_hms(2023, 10, 13, 23, 0, 0).unwrap();
+        assert_eq!(date.to_rfc3339(), "2023-10-13T23:00:00-07:00");
+        assert_eq!(date.date_naive().to_string(), "2023-10-13");
+        assert_eq!(
+            date.with_timezone(&New_York).to_rfc3339(),
+            "2023-10-14T02:00:00-04:00"
+        );
+        assert_eq!(
+            date.with_timezone(&New_York).date_naive().to_string(),
+            "2023-10-14"
+        );
+    }
+
+    #[test]
+    fn it_can_parse_with_offset() {
+        let reference = "2023-10-13T23:00:00-08:00";
+        let date = DateTime::parse_from_rfc3339(reference).unwrap();
+        assert_eq!(
+            date,
+            FixedOffset::west_opt(8 * 60 * 60)
+                .unwrap()
+                .with_ymd_and_hms(2023, 10, 13, 23, 0, 0)
+                .unwrap()
+        );
+        assert_eq!(
+            date.with_timezone(&New_York),
+            FixedOffset::west_opt(4 * 60 * 60)
+                .unwrap()
+                .with_ymd_and_hms(2023, 10, 14, 03, 0, 0)
+                .unwrap()
+        );
+        assert_eq!(
+            date.date_naive(),
+            NaiveDate::from_ymd_opt(2023, 10, 13).unwrap()
+        );
+        assert_eq!(
+            date.with_timezone(&New_York).date_naive(),
+            NaiveDate::from_ymd_opt(2023, 10, 14).unwrap()
+        );
+    }
+}