fix local timezone, add tests

.travis.yml

@@ -21,6 +21,8 @@ env:
   global:
     - LD_LIBRARY_PATH: /usr/local/lib
     - CLIPPY: n
+install:
+  - curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
 script: ./ci/travis.sh
 notifications:
   email: false

Cargo.toml

@@ -39,15 +39,16 @@ serde = { version = "1", optional = true }
 wasm-bindgen = { version = "0.2" }
 js-sys = "0.3" # contains FFI bindings for the JS Date API
 
-
-
 [dev-dependencies]
 serde_json = { version = "1" }
 serde_derive = { version = "1" }
 bincode = { version = "0.8.0" }
 num-iter = { version = "0.1.35", default-features = false }
 doc-comment = "0.3"
 
+[target.'cfg(target_arch = "wasm32")'.dev-dependencies]
+wasm-bindgen-test = "0.2"
+
 [package.metadata.docs.rs]
 all-features = true
 

ci/travis.sh

@@ -48,6 +48,16 @@ build_and_test() {
   channel build -v --no-default-features --features serde,rustc-serialize
   TZ=Asia/Katmandu channel test -v --no-default-features --features serde,rustc-serialize --lib
 
+  # wasm tests
+  touch tests/wasm.rs # ensure rebuild happens so TZ / NOW take effect
+  TZ=ACST-9:30 NOW=$(date +%s) wasm-pack test --node
+  touch tests/wasm.rs
+  TZ=EST4 NOW=$(date +%s) wasm-pack test --node
+  touch tests/wasm.rs
+  TZ=UTC0 NOW=$(date +%s) wasm-pack test --node
+  touch tests/wasm.rs
+  TZ=Asia/Katmandu NOW=$(date +%s) wasm-pack test --node
+
   if [[ "$CHANNEL" == stable ]]; then
       if [[ -n "$TRAVIS" ]] ; then
           check_readme

src/offset/local.rs

@@ -97,7 +97,10 @@ impl Local {
     pub fn now() -> DateTime<Local> {
         use super::Utc;
         let now: DateTime<Utc> = super::Utc::now();
-        now.with_timezone(&Local)
+
+        // Workaround missing timezone logic in `time` crate
+        let offset = FixedOffset::west((js_sys::Date::new_0().get_timezone_offset() as i32) * 60);
+        DateTime::from_utc(now.naive_utc(), offset)
     }
 }
 

tests/wasm.rs

@@ -0,0 +1,27 @@
+extern crate chrono;
+extern crate wasm_bindgen_test;
+
+use chrono::prelude::*;
+use wasm_bindgen_test::*;
+
+use std::env;
+
+#[wasm_bindgen_test]
+fn now() {
+    let utc: DateTime<Utc> = Utc::now();
+    let local: DateTime<Local> = Local::now();
+
+    // Ensure time fetched is correct
+    let actual = Utc.datetime_from_str(env!("NOW"), "%s").unwrap();
+    assert!(utc - actual < chrono::Duration::minutes(5));
+
+    // Ensure offset retrieved when getting local time is correct
+    let expected_offset = match env!("TZ") {
+        "ACST-9:30" => FixedOffset::east(19 * 30 * 60),
+        "Asia/Katmandu" => FixedOffset::east(23 * 15 * 60), // No DST thankfully
+        "EST4" => FixedOffset::east(-4 * 60 * 60),
+        "UTC0" => FixedOffset::east(0),
+        _ => panic!("unexpected TZ"),
+    };
+    assert_eq!(&expected_offset, local.offset());
+}