perf: short circuit in POSIX tz when there is no DST

Ref #103 PR #104
BurntSushi · Aug 18, 2024 · 76c103e · 76c103e
1 parent 5b11089
commit 76c103e
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/tz/posix.rs b/src/tz/posix.rs
@@ -286,6 +286,10 @@ impl ReasonablePosixTimeZone {
         &self,
         timestamp: Timestamp,
     ) -> (Offset, Dst, &str) {
+        if self.dst.is_none() {
+            return (self.std_offset(), Dst::No, &self.std_abbrev);
+        }
+
         let dt = Offset::UTC.to_datetime(timestamp);
         self.dst_info_utc(dt.date().year_ranged())
             .filter(|dst_info| dst_info.in_dst(dt))