added chrono crate

backend/public/Cargo.lock

@@ -226,7 +226,9 @@ checksum = "a21f936df1771bf62b77f047b726c4625ff2e8aa607c01ec06e5a05bd8463401"
 dependencies = [
  "android-tzdata",
  "iana-time-zone",
+ "js-sys",
  "num-traits",
+ "wasm-bindgen",
  "windows-targets 0.52.6",
 ]
 
@@ -1049,6 +1051,7 @@ name = "public"
 version = "0.1.0"
 dependencies = [
  "axum",
+ "chrono",
  "dotenvy",
  "serde",
  "serde_json",