Fix warnings and remove obsolete code

crates/trustchain-core/src/utils.rs

@@ -301,18 +301,6 @@ pub fn generate_key() -> JWK {
     JWK::generate_secp256k1().expect("Could not generate key.")
 }
 
-#[allow(dead_code)]
-pub fn set_panic_hook() {
-    // When the `console_error_panic_hook` feature is enabled, we can call the
-    // `set_panic_hook` function at least once during initialization, and then
-    // we will get better error messages if our code ever panics.
-    //
-    // For more details see
-    // <https://github.com/rustwasm/console_error_panic_hook#readme>
-    #[cfg(feature = "console_error_panic_hook")]
-    console_error_panic_hook::set_once();
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;

crates/trustchain-ion/src/utils.rs

@@ -331,7 +331,7 @@ pub fn time_at_block_height(
 /// Returns the unix timestamp at 00h:00m:00s UTC on the given date.
 fn first_unixtime_on(date: NaiveDate) -> i64 {
     let datetime = date.and_hms_opt(0, 0, 0).unwrap();
-    datetime.timestamp()
+    datetime.and_utc().timestamp()
 }
 
 /// Returns the height of the last block mined before the given date.