From f317f58545493f7421557befa349061a5eecc5e3 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Fri, 30 Jan 2026 01:09:06 -0600
Subject: [PATCH] cleanups

---
 esphome/components/time/posix_tz.cpp | 2 +-
 esphome/components/time/posix_tz.h   | 7 +++++--
 esphome/core/time.cpp                | 2 +-
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/esphome/components/time/posix_tz.cpp b/esphome/components/time/posix_tz.cpp
index e57d3b3a2f9..06140599a96 100644
--- a/esphome/components/time/posix_tz.cpp
+++ b/esphome/components/time/posix_tz.cpp
@@ -336,7 +336,7 @@ time_t __attribute__((noinline)) calculate_dst_transition(int year, const DSTRul
 }  // namespace internal
 
 bool __attribute__((noinline)) is_in_dst(time_t utc_epoch, const ParsedTimezone &tz) {
-  if (!tz.has_dst) {
+  if (!tz.has_dst()) {
     return false;
   }
 
diff --git a/esphome/components/time/posix_tz.h b/esphome/components/time/posix_tz.h
index 6dbb09296e5..5446ddb9df6 100644
--- a/esphome/components/time/posix_tz.h
+++ b/esphome/components/time/posix_tz.h
@@ -9,6 +9,7 @@ namespace esphome::time {
 
 /// Type of DST transition rule
 enum class DSTRuleType : uint8_t {
+  NONE = 0,        ///< No DST rule (used to indicate no DST)
   MONTH_WEEK_DAY,  ///< M format: Mm.w.d (e.g., M3.2.0 = 2nd Sunday of March)
   JULIAN_NO_LEAP,  ///< J format: Jn (day 1-365, Feb 29 not counted)
   DAY_OF_YEAR,     ///< Plain number: n (day 0-365, Feb 29 counted in leap years)
@@ -24,13 +25,15 @@ struct DSTRule {
   uint8_t day_of_week;   ///< Day 0-6, 0 = Sunday (for MONTH_WEEK_DAY)
 };
 
-/// Parsed POSIX timezone information
+/// Parsed POSIX timezone information (packed for 32-bit: 32 bytes)
 struct ParsedTimezone {
   int32_t std_offset_seconds;  ///< Standard time offset from UTC in seconds (positive = west)
   int32_t dst_offset_seconds;  ///< DST offset from UTC in seconds
   DSTRule dst_start;           ///< When DST starts
   DSTRule dst_end;             ///< When DST ends
-  bool has_dst;                ///< Whether this timezone has DST
+
+  /// Check if this timezone has DST rules
+  bool has_dst() const { return this->dst_start.type != DSTRuleType::NONE; }
 };
 
 /// Parse a POSIX TZ string into a ParsedTimezone struct.
diff --git a/esphome/core/time.cpp b/esphome/core/time.cpp
index b1db0814467..b2f1493e2cd 100644
--- a/esphome/core/time.cpp
+++ b/esphome/core/time.cpp
@@ -268,7 +268,7 @@ void ESPTime::recalc_timestamp_local() {
   // POSIX: local = utc - offset, so utc = local + offset
   const auto &tz = time::get_global_tz();
 
-  if (!tz.has_dst) {
+  if (!tz.has_dst()) {
     // No DST - just apply standard offset
     this->timestamp += tz.std_offset_seconds;
     return;