3 files changed, 70 insertions, 0 deletions
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;
+        }
+    }
+}