8 files changed, 100 insertions, 0 deletions
diff --git a/docs/release-notes.md b/docs/release-notes.md
index 15747488..5293f1c1 100644
--- a/docs/release-notes.md
+++ b/docs/release-notes.md
@@ -5,6 +5,7 @@
   * Tweaked installer to reduce antivirus false positives.
 
 * For modders:
+  * Added `GameLoop.OneSecondUpdateTicking/Ticked` events.
   * Added `Specialised.LoadStageChanged` for mods which need to do something at a specific point in the game's save loading process.
   * You can now use read/write save data as soon as the save is loaded (instead of once the world is initialised).
 
diff --git a/src/SMAPI/Events/IGameLoopEvents.cs b/src/SMAPI/Events/IGameLoopEvents.cs
index ea79aa74..6fb56c8b 100644
--- a/src/SMAPI/Events/IGameLoopEvents.cs
+++ b/src/SMAPI/Events/IGameLoopEvents.cs
@@ -14,6 +14,12 @@ namespace StardewModdingAPI.Events
         /// <summary>Raised after the game state is updated (≈60 times per second).</summary>
         event EventHandler<UpdateTickedEventArgs> UpdateTicked;
 
+        /// <summary>Raised once per second before the game state is updated.</summary>
+        event EventHandler<OneSecondUpdateTickingEventArgs> OneSecondUpdateTicking;
+
+        /// <summary>Raised once per second after the game state is updated.</summary>
+        event EventHandler<OneSecondUpdateTickedEventArgs> OneSecondUpdateTicked;
+
         /// <summary>Raised before the game creates a new save file.</summary>
         event EventHandler<SaveCreatingEventArgs> SaveCreating;
 
diff --git a/src/SMAPI/Events/OneSecondUpdateTickedEventArgs.cs b/src/SMAPI/Events/OneSecondUpdateTickedEventArgs.cs
new file mode 100644
index 00000000..d330502a
--- /dev/null
+++ b/src/SMAPI/Events/OneSecondUpdateTickedEventArgs.cs
@@ -0,0 +1,32 @@
+using System;
+
+namespace StardewModdingAPI.Events
+{
+    /// <summary>Event arguments for an <see cref="IGameLoopEvents.OneSecondUpdateTicked"/> event.</summary>
+    public class OneSecondUpdateTickedEventArgs : EventArgs
+    {
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>The number of ticks elapsed since the game started, including the current tick.</summary>
+        public uint Ticks { get; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="ticks">The number of ticks elapsed since the game started, including the current tick.</param>
+        internal OneSecondUpdateTickedEventArgs(uint ticks)
+        {
+            this.Ticks = ticks;
+        }
+
+        /// <summary>Get whether <see cref="Ticks"/> is a multiple of the given <paramref name="number"/>. This is mainly useful if you want to run logic intermittently (e.g. <code>e.IsMultipleOf(30)</code> for every half-second).</summary>
+        /// <param name="number">The factor to check.</param>
+        public bool IsMultipleOf(uint number)
+        {
+            return this.Ticks % number == 0;
+        }
+    }
+}
diff --git a/src/SMAPI/Events/OneSecondUpdateTickingEventArgs.cs b/src/SMAPI/Events/OneSecondUpdateTickingEventArgs.cs
new file mode 100644
index 00000000..cdd9f4cc
--- /dev/null
+++ b/src/SMAPI/Events/OneSecondUpdateTickingEventArgs.cs
@@ -0,0 +1,32 @@
+using System;
+
+namespace StardewModdingAPI.Events
+{
+    /// <summary>Event arguments for an <see cref="IGameLoopEvents.OneSecondUpdateTicking"/> event.</summary>
+    public class OneSecondUpdateTickingEventArgs : EventArgs
+    {
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>The number of ticks elapsed since the game started, including the current tick.</summary>
+        public uint Ticks { get; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="ticks">The number of ticks elapsed since the game started, including the current tick.</param>
+        internal OneSecondUpdateTickingEventArgs(uint ticks)
+        {
+            this.Ticks = ticks;
+        }
+
+        /// <summary>Get whether <see cref="Ticks"/> is a multiple of the given <paramref name="number"/>. This is mainly useful if you want to run logic intermittently (e.g. <code>e.IsMultipleOf(30)</code> for every half-second).</summary>
+        /// <param name="number">The factor to check.</param>
+        public bool IsMultipleOf(uint number)
+        {
+            return this.Ticks % number == 0;
+        }
+    }
+}
diff --git a/src/SMAPI/Framework/Events/EventManager.cs b/src/SMAPI/Framework/Events/EventManager.cs
index b7f00f52..13244601 100644
--- a/src/SMAPI/Framework/Events/EventManager.cs
+++ b/src/SMAPI/Framework/Events/EventManager.cs
@@ -58,6 +58,12 @@ namespace StardewModdingAPI.Framework.Events
         /// <summary>Raised after the game performs its overall update tick (≈60 times per second).</summary>
         public readonly ManagedEvent<UpdateTickedEventArgs> UpdateTicked;
 
+        /// <summary>Raised once per second before the game performs its overall update tick.</summary>
+        public readonly ManagedEvent<OneSecondUpdateTickingEventArgs> OneSecondUpdateTicking;
+
+        /// <summary>Raised once per second after the game performs its overall update tick.</summary>
+        public readonly ManagedEvent<OneSecondUpdateTickedEventArgs> OneSecondUpdateTicked;
+
         /// <summary>Raised before the game creates the save file.</summary>
         public readonly ManagedEvent<SaveCreatingEventArgs> SaveCreating;
 
@@ -380,6 +386,8 @@ namespace StardewModdingAPI.Framework.Events
             this.GameLaunched = ManageEventOf<GameLaunchedEventArgs>(nameof(IModEvents.GameLoop), nameof(IGameLoopEvents.GameLaunched));
             this.UpdateTicking = ManageEventOf<UpdateTickingEventArgs>(nameof(IModEvents.GameLoop), nameof(IGameLoopEvents.UpdateTicking));
             this.UpdateTicked = ManageEventOf<UpdateTickedEventArgs>(nameof(IModEvents.GameLoop), nameof(IGameLoopEvents.UpdateTicked));
+            this.OneSecondUpdateTicking = ManageEventOf<OneSecondUpdateTickingEventArgs>(nameof(IModEvents.GameLoop), nameof(IGameLoopEvents.OneSecondUpdateTicking));
+            this.OneSecondUpdateTicked = ManageEventOf<OneSecondUpdateTickedEventArgs>(nameof(IModEvents.GameLoop), nameof(IGameLoopEvents.OneSecondUpdateTicked));
             this.SaveCreating = ManageEventOf<SaveCreatingEventArgs>(nameof(IModEvents.GameLoop), nameof(IGameLoopEvents.SaveCreating));
             this.SaveCreated = ManageEventOf<SaveCreatedEventArgs>(nameof(IModEvents.GameLoop), nameof(IGameLoopEvents.SaveCreated));
             this.Saving = ManageEventOf<SavingEventArgs>(nameof(IModEvents.GameLoop), nameof(IGameLoopEvents.Saving));
diff --git a/src/SMAPI/Framework/Events/ModGameLoopEvents.cs b/src/SMAPI/Framework/Events/ModGameLoopEvents.cs
index 3a764ab0..0177c22e 100644
--- a/src/SMAPI/Framework/Events/ModGameLoopEvents.cs
+++ b/src/SMAPI/Framework/Events/ModGameLoopEvents.cs
@@ -30,6 +30,20 @@ namespace StardewModdingAPI.Framework.Events
             remove => this.EventManager.UpdateTicked.Remove(value);
         }
 
+        /// <summary>Raised once per second before the game state is updated.</summary>
+        public event EventHandler<OneSecondUpdateTickingEventArgs> OneSecondUpdateTicking
+        {
+            add => this.EventManager.OneSecondUpdateTicking.Add(value);
+            remove => this.EventManager.OneSecondUpdateTicking.Remove(value);
+        }
+
+        /// <summary>Raised once per second after the game state is updated.</summary>
+        public event EventHandler<OneSecondUpdateTickedEventArgs> OneSecondUpdateTicked
+        {
+            add => this.EventManager.OneSecondUpdateTicked.Add(value);
+            remove => this.EventManager.OneSecondUpdateTicked.Remove(value);
+        }
+
         /// <summary>Raised before the game creates a new save file.</summary>
         public event EventHandler<SaveCreatingEventArgs> SaveCreating
         {
diff --git a/src/SMAPI/Framework/SGame.cs b/src/SMAPI/Framework/SGame.cs
index cb62de2a..8abe4d16 100644
--- a/src/SMAPI/Framework/SGame.cs
+++ b/src/SMAPI/Framework/SGame.cs
@@ -878,8 +878,11 @@ namespace StardewModdingAPI.Framework
                     this.OnLoadStageChanged(LoadStage.Loaded);
 
                 // update tick
+                bool isOneSecond = this.TicksElapsed % 60 == 0;
                 this.Events.UnvalidatedUpdateTicking.Raise(new UnvalidatedUpdateTickingEventArgs(this.TicksElapsed));
                 this.Events.UpdateTicking.Raise(new UpdateTickingEventArgs(this.TicksElapsed));
+                if (isOneSecond)
+                    this.Events.OneSecondUpdateTicking.Raise(new OneSecondUpdateTickingEventArgs(this.TicksElapsed));
                 try
                 {
                     this.Input.UpdateSuppression();
@@ -891,6 +894,8 @@ namespace StardewModdingAPI.Framework
                 }
                 this.Events.UnvalidatedUpdateTicked.Raise(new UnvalidatedUpdateTickedEventArgs(this.TicksElapsed));
                 this.Events.UpdateTicked.Raise(new UpdateTickedEventArgs(this.TicksElapsed));
+                if (isOneSecond)
+                    this.Events.OneSecondUpdateTicked.Raise(new OneSecondUpdateTickedEventArgs(this.TicksElapsed));
 
                 /*********
                 ** Update events
diff --git a/src/SMAPI/StardewModdingAPI.csproj b/src/SMAPI/StardewModdingAPI.csproj
index fdb0c6c7..5540f277 100644
--- a/src/SMAPI/StardewModdingAPI.csproj
+++ b/src/SMAPI/StardewModdingAPI.csproj
@@ -135,6 +135,8 @@
     <Compile Include="Events\MultiplayerEvents.cs" />
     <Compile Include="Events\NpcListChangedEventArgs.cs" />
     <Compile Include="Events\ObjectListChangedEventArgs.cs" />
+    <Compile Include="Events\OneSecondUpdateTickedEventArgs.cs" />
+    <Compile Include="Events\OneSecondUpdateTickingEventArgs.cs" />
     <Compile Include="Events\PeerContextReceivedEventArgs.cs" />
     <Compile Include="Events\PeerDisconnectedEventArgs.cs" />
     <Compile Include="Events\PlayerEvents.cs" />