From 41fcdab3b5549ed93c87409bcf0b526a39d8b31c Mon Sep 17 00:00:00 2001
From: clubby789 <jamie@hill-daniel.co.uk>
Date: Thu, 3 Apr 2025 13:28:10 +0000
Subject: [PATCH] Switch `time` to `jiff` for time formatting in ICE dumps

---
 Cargo.lock                                 | 54 +---------------------
 compiler/rustc_driver_impl/Cargo.toml      |  2 +-
 compiler/rustc_driver_impl/src/lib.rs      | 13 ++----
 src/bootstrap/src/utils/proc_macro_deps.rs |  2 -
 src/tools/tidy/src/deps.rs                 |  9 ++--
 5 files changed, 8 insertions(+), 72 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 96526f7e9e7..3c96e195191 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -890,15 +890,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "deranged"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c9e6a11ca8224451684bc0d7d5a7adbf8f2fd6887261a1cfc3c0432f9d4068e"
-dependencies = [
- "powerfmt",
-]
-
 [[package]]
 name = "derive-where"
 version = "1.2.7"
@@ -2385,12 +2376,6 @@ dependencies = [
  "num-traits",
 ]
 
-[[package]]
-name = "num-conv"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "51d515d32fb182ee37cda2ccdcb92950d6a3c2893aa280e540671c2cd0f3b1d9"
-
 [[package]]
 name = "num-integer"
 version = "0.1.46"
@@ -2768,12 +2753,6 @@ dependencies = [
  "portable-atomic",
 ]
 
-[[package]]
-name = "powerfmt"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "439ee305def115ba05938db6eb1644ff94165c5ab5e9420d1c1bcedbba909391"
-
 [[package]]
 name = "ppv-lite86"
 version = "0.2.21"
@@ -3572,6 +3551,7 @@ name = "rustc_driver_impl"
 version = "0.0.0"
 dependencies = [
  "ctrlc",
+ "jiff",
  "libc",
  "rustc_abi",
  "rustc_ast",
@@ -3618,7 +3598,6 @@ dependencies = [
  "rustc_ty_utils",
  "serde_json",
  "shlex",
- "time",
  "tracing",
  "windows 0.59.0",
 ]
@@ -5311,37 +5290,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "time"
-version = "0.3.41"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a7619e19bc266e0f9c5e6686659d394bc57973859340060a69221e57dbc0c40"
-dependencies = [
- "deranged",
- "itoa",
- "num-conv",
- "powerfmt",
- "serde",
- "time-core",
- "time-macros",
-]
-
-[[package]]
-name = "time-core"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c9e9a38711f559d9e3ce1cdb06dd7c5b8ea546bc90052da6d06bb76da74bb07c"
-
-[[package]]
-name = "time-macros"
-version = "0.2.22"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3526739392ec93fd8b359c8e98514cb3e8e021beb4e5f597b00a0221f8ed8a49"
-dependencies = [
- "num-conv",
- "time-core",
-]
-
 [[package]]
 name = "tinystr"
 version = "0.7.6"
diff --git a/compiler/rustc_driver_impl/Cargo.toml b/compiler/rustc_driver_impl/Cargo.toml
index de643355f5f..c823d11126e 100644
--- a/compiler/rustc_driver_impl/Cargo.toml
+++ b/compiler/rustc_driver_impl/Cargo.toml
@@ -4,6 +4,7 @@ version = "0.0.0"
 edition = "2024"
 
 [dependencies]
+jiff = { version = "0.2.5", default-features = false, features = ["std"] }
 # tidy-alphabetical-start
 rustc_abi = { path = "../rustc_abi" }
 rustc_ast = { path = "../rustc_ast" }
@@ -50,7 +51,6 @@ rustc_trait_selection = { path = "../rustc_trait_selection" }
 rustc_ty_utils = { path = "../rustc_ty_utils" }
 serde_json = "1.0.59"
 shlex = "1.0"
-time = { version = "0.3.36", default-features = false, features = ["alloc", "formatting", "macros"] }
 tracing = { version = "0.1.35" }
 # tidy-alphabetical-end
 
diff --git a/compiler/rustc_driver_impl/src/lib.rs b/compiler/rustc_driver_impl/src/lib.rs
index f1dc4bb795e..75478d9fdea 100644
--- a/compiler/rustc_driver_impl/src/lib.rs
+++ b/compiler/rustc_driver_impl/src/lib.rs
@@ -30,7 +30,7 @@ use std::path::{Path, PathBuf};
 use std::process::{self, Command, Stdio};
 use std::sync::OnceLock;
 use std::sync::atomic::{AtomicBool, Ordering};
-use std::time::{Instant, SystemTime};
+use std::time::Instant;
 use std::{env, str};
 
 use rustc_ast as ast;
@@ -66,8 +66,6 @@ use rustc_session::{EarlyDiagCtxt, Session, config, filesearch};
 use rustc_span::FileName;
 use rustc_target::json::ToJson;
 use rustc_target::spec::{Target, TargetTuple};
-use time::OffsetDateTime;
-use time::macros::format_description;
 use tracing::trace;
 
 #[allow(unused_macros)]
@@ -1304,13 +1302,8 @@ fn ice_path_with_config(config: Option<&UnstableOptions>) -> &'static Option<Pat
                 .or_else(|| std::env::current_dir().ok())
                 .unwrap_or_default(),
         };
-        let now: OffsetDateTime = SystemTime::now().into();
-        let file_now = now
-            .format(
-                // Don't use a standard datetime format because Windows doesn't support `:` in paths
-                &format_description!("[year]-[month]-[day]T[hour]_[minute]_[second]"),
-            )
-            .unwrap_or_default();
+        // Don't use a standard datetime format because Windows doesn't support `:` in paths
+        let file_now = jiff::Zoned::now().strftime("%Y-%m-%dT%H_%M_%S");
         let pid = std::process::id();
         path.push(format!("rustc-ice-{file_now}-{pid}.txt"));
         Some(path)
diff --git a/src/bootstrap/src/utils/proc_macro_deps.rs b/src/bootstrap/src/utils/proc_macro_deps.rs
index dbfd6f47dc6..faf9a07317c 100644
--- a/src/bootstrap/src/utils/proc_macro_deps.rs
+++ b/src/bootstrap/src/utils/proc_macro_deps.rs
@@ -31,7 +31,6 @@ pub static CRATES: &[&str] = &[
     "mime_guess",
     "minimal-lexical",
     "nom",
-    "num-conv",
     "once_cell",
     "pest",
     "pest_generator",
@@ -49,7 +48,6 @@ pub static CRATES: &[&str] = &[
     "syn",
     "synstructure",
     "thiserror",
-    "time-core",
     "tinystr",
     "type-map",
     "typenum",
diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
index 8f761d349cc..5dcb92744d0 100644
--- a/src/tools/tidy/src/deps.rs
+++ b/src/tools/tidy/src/deps.rs
@@ -270,7 +270,6 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "darling_core",
     "darling_macro",
     "datafrog",
-    "deranged",
     "derive-where",
     "derive_setters",
     "digest",
@@ -311,6 +310,8 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "intl_pluralrules",
     "itertools",
     "itoa",
+    "jiff",
+    "jiff-static",
     "jobserver",
     "lazy_static",
     "leb128",
@@ -328,7 +329,6 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "miniz_oxide",
     "nix",
     "nu-ansi-term",
-    "num-conv",
     "num_cpus",
     "object",
     "odht",
@@ -341,7 +341,7 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "pin-project-lite",
     "polonius-engine",
     "portable-atomic", // dependency for platforms doesn't support `AtomicU64` in std
-    "powerfmt",
+    "portable-atomic-util",
     "ppv-lite86",
     "proc-macro-hack",
     "proc-macro2",
@@ -394,9 +394,6 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "thorin-dwp",
     "thread_local",
     "tikv-jemalloc-sys",
-    "time",
-    "time-core",
-    "time-macros",
     "tinystr",
     "tinyvec",
     "tinyvec_macros",