From b0f8922056f985d9a01bdbadea0d40d41ff67d53 Mon Sep 17 00:00:00 2001
From: Adrian Freund <adrian+github@freund.io>
Date: Sun, 6 Jul 2025 00:00:39 +0200
Subject: [PATCH] Mark ESPTime comparison operators as const (#9335)

---
 esphome/core/time.cpp | 10 +++++-----
 esphome/core/time.h   | 10 +++++-----
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/esphome/core/time.cpp b/esphome/core/time.cpp
index 672f5b98bf..f9652b5329 100644
--- a/esphome/core/time.cpp
+++ b/esphome/core/time.cpp
@@ -226,11 +226,11 @@ int32_t ESPTime::timezone_offset() {
   return offset;
 }
 
-bool ESPTime::operator<(ESPTime other) { return this->timestamp < other.timestamp; }
-bool ESPTime::operator<=(ESPTime other) { return this->timestamp <= other.timestamp; }
-bool ESPTime::operator==(ESPTime other) { return this->timestamp == other.timestamp; }
-bool ESPTime::operator>=(ESPTime other) { return this->timestamp >= other.timestamp; }
-bool ESPTime::operator>(ESPTime other) { return this->timestamp > other.timestamp; }
+bool ESPTime::operator<(const ESPTime &other) const { return this->timestamp < other.timestamp; }
+bool ESPTime::operator<=(const ESPTime &other) const { return this->timestamp <= other.timestamp; }
+bool ESPTime::operator==(const ESPTime &other) const { return this->timestamp == other.timestamp; }
+bool ESPTime::operator>=(const ESPTime &other) const { return this->timestamp >= other.timestamp; }
+bool ESPTime::operator>(const ESPTime &other) const { return this->timestamp > other.timestamp; }
 
 template<typename T> bool increment_time_value(T &current, uint16_t begin, uint16_t end) {
   current++;
diff --git a/esphome/core/time.h b/esphome/core/time.h
index 5cbd9369fb..a53fca2346 100644
--- a/esphome/core/time.h
+++ b/esphome/core/time.h
@@ -109,10 +109,10 @@ struct ESPTime {
   void increment_second();
   /// Increment this clock instance by one day.
   void increment_day();
-  bool operator<(ESPTime other);
-  bool operator<=(ESPTime other);
-  bool operator==(ESPTime other);
-  bool operator>=(ESPTime other);
-  bool operator>(ESPTime other);
+  bool operator<(const ESPTime &other) const;
+  bool operator<=(const ESPTime &other) const;
+  bool operator==(const ESPTime &other) const;
+  bool operator>=(const ESPTime &other) const;
+  bool operator>(const ESPTime &other) const;
 };
 }  // namespace esphome