From ef5d9597887d75f6c218ef1fe750a58406c4eaaf Mon Sep 17 00:00:00 2001
From: Rebbe Pod <66928914+RebbePod@users.noreply.github.com>
Date: Mon, 24 Jan 2022 15:54:46 -0500
Subject: [PATCH] Add increment_day function to ESPTime (#2955)

---
 esphome/components/time/real_time_clock.cpp | 17 +++++++++++++++++
 esphome/components/time/real_time_clock.h   |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/esphome/components/time/real_time_clock.cpp b/esphome/components/time/real_time_clock.cpp
index 6f6739d293..0469ba2c37 100644
--- a/esphome/components/time/real_time_clock.cpp
+++ b/esphome/components/time/real_time_clock.cpp
@@ -131,6 +131,23 @@ void ESPTime::increment_second() {
     this->year++;
   }
 }
+void ESPTime::increment_day() {
+  this->timestamp += 86400;
+
+  // increment day
+  increment_time_value(this->day_of_week, 1, 8);
+
+  if (increment_time_value(this->day_of_month, 1, days_in_month(this->month, this->year) + 1)) {
+    // day of month roll-over, increment month
+    increment_time_value(this->month, 1, 13);
+  }
+
+  uint16_t days_in_year = (this->year % 4 == 0) ? 366 : 365;
+  if (increment_time_value(this->day_of_year, 1, days_in_year + 1)) {
+    // day of year roll-over, increment year
+    this->year++;
+  }
+}
 void ESPTime::recalc_timestamp_utc(bool use_day_of_year) {
   time_t res = 0;
 
diff --git a/esphome/components/time/real_time_clock.h b/esphome/components/time/real_time_clock.h
index 0c6fa6f3a0..c45deb0be5 100644
--- a/esphome/components/time/real_time_clock.h
+++ b/esphome/components/time/real_time_clock.h
@@ -90,6 +90,8 @@ struct ESPTime {
 
   /// Increment this clock instance by one second.
   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);