Initial commit

.gitignore

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+/target
+Cargo.lock

Cargo.toml

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+[package]
+name = "wasm-time"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+time = "0.3"
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+wasm-bindgen = "0.2"
+

src/lib.rs

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+use time::OffsetDateTime;
+
+#[cfg(target_arch = "wasm32")]
+#[wasm_bindgen::prelude::wasm_bindgen(inline_js = r#"
+export function unix_millis_now() {
+  return Date.now();
+}"#)]
+extern "C" {
+    fn unix_millis_now() -> f64;
+}
+
+pub fn now_utc() -> OffsetDateTime {
+    #[cfg(target_arch = "wasm32")]
+    return OffsetDateTime::from_unix_timestamp_nanos((unix_millis_now() * 1_000_000f64) as i128).expect("time outside supported range");
+    #[cfg(not(target_arch = "wasm32"))]
+    return OffsetDateTime::now_utc();
+}
+