Problem with 'rust-std' component and chronos crate about yew HOT 1 CLOSED

Use cargo:

cargo build --target wasm32-unknown-unknown

or if you have cargo-web, then it does all the useful stuff of hosting a web server and webassembly host javascript file as well.

cargo web start --target-webasm

Although the chrono crate won't work with the wasm32-unknown-unknown target because it doesn't support non-linux and non-windows systems (whereas the wasm32-unknown-emscripten target pretends to be linux and has javascript hooks for some of the system calls I believe). I have a fix for that on my local system, but I'm unsure if it's quality enough to be checked into the chrono crate directly.

from yew.