crosstime-rs/src/lib.rs

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();
}