Clean up timezone implementation and use workspace dependencies

Author: mutualideas

Cargo.lock

@@ -53,6 +53,7 @@ gantz_egui = { version = "0.1.0", path = "crates/gantz_egui" }
 gantz_std = { version = "0.1.0", path = "crates/gantz_std" }
 hex = "0.4"
 humantime = "2.3"
+js-sys = "0.3"
 log = { version = "0.4", features = ["serde"] }
 petgraph = { version = "0.8", features = ["serde-1"] }
 ron = "0.10"

Cargo.toml

@@ -23,6 +23,7 @@ gantz_core.workspace = true
 gantz_std.workspace = true
 hex.workspace = true
 humantime.workspace = true
+js-sys.workspace = true
 log.workspace = true
 petgraph.workspace = true
 serde.workspace = true
@@ -32,7 +33,7 @@ time.workspace = true
 tracing = { workspace = true, optional = true }
 tracing-subscriber = { workspace = true, optional = true }
 web-time.workspace = true
-js-sys = "0.3"
+
 
 [dev-dependencies]
 dyn-clone.workspace = true

crates/gantz_egui/Cargo.toml

@@ -1,7 +1,7 @@
 //! A collection of useful widgets for gantz.
-use time::{OffsetDateTime, UtcOffset};
 #[cfg(target_arch = "wasm32")]
 use js_sys::Date;
+use time::{OffsetDateTime, UtcOffset};
 
 pub use command_palette::CommandPalette;
 pub use gantz::{Gantz, GantzState};
@@ -27,26 +27,24 @@ pub mod trace_view;
 pub(crate) fn to_local_datetime(datetime: OffsetDateTime) -> OffsetDateTime {
     #[cfg(not(target_arch = "wasm32"))]
     {
-        // Native: use time crate's method
+        // Native platforms: use time crate's built-in method
         UtcOffset::current_local_offset()
             .map(|offset| datetime.to_offset(offset))
             .unwrap_or(datetime)
     }
 
     #[cfg(target_arch = "wasm32")]
     {
-        // WASM: manually get offset from JavaScript
+        // WASM: get timezone offset from JavaScript Date API
         use js_sys::Date;
 
         let js_date = Date::new_0();
         let offset_minutes = js_date.get_timezone_offset();
-
-        // Convert minutes to seconds (offset is negative of what we want)
         let offset_seconds = -(offset_minutes as i32 * 60);
 
         match UtcOffset::from_whole_seconds(offset_seconds) {
             Ok(offset) => datetime.to_offset(offset),
-            Err(_) => datetime, // Fallback to UTC
+            Err(_) => datetime,
         }
     }
 }