fix: add date to the version string on Mac

It doesn't support `--iso`

crates/rust-analyzer/build.rs

@@ -55,7 +55,7 @@ fn commit_hash() -> Option<String> {
 }
 
 fn build_date() -> Option<String> {
-    output_to_string("date --iso --utc")
+    output_to_string("date --utc +%Y-%m-%d")
 }
 
 fn output_to_string(command: &str) -> Option<String> {

xtask/src/main.rs

@@ -108,7 +108,7 @@ fn run_fuzzer() -> Result<()> {
 }
 
 fn date_iso() -> Result<String> {
-    let res = cmd!("date --iso --utc").read()?;
+    let res = cmd!("date --utc +%Y-%m-%d").read()?;
     Ok(res)
 }