Actions System + UI (#2710)

Co-authored-by: Vera Aguilera Puerto <6766154+Zumorica@users.noreply.github.com>

Content.Shared/Utility/Cooldowns.cs

@@ -0,0 +1,28 @@
+using System;
+using Robust.Shared.Interfaces.Timing;
+using Robust.Shared.IoC;
+
+namespace Content.Shared.Utility
+{
+    /// <summary>
+    /// Utilities for working with cooldowns.
+    /// </summary>
+    public static class Cooldowns
+    {
+        /// <param name="gameTiming">game timing to use, otherwise will resolve using IoCManager.</param>
+        /// <returns>a cooldown interval starting at GameTiming.Curtime and ending at (offset) from CurTime.
+        /// For example, passing TimeSpan.FromSeconds(5) will create an interval
+        /// from now to 5 seconds from now.</returns>
+        public static (TimeSpan start, TimeSpan end) FromNow(TimeSpan offset, IGameTiming gameTiming = null)
+        {
+            var now = (gameTiming ?? IoCManager.Resolve<IGameTiming>()).CurTime;
+            return (now, now + offset);
+        }
+
+        /// <see cref="FromNow"/>
+        public static (TimeSpan start, TimeSpan end) SecondsFromNow(double seconds, IGameTiming gameTiming = null)
+        {
+            return FromNow(TimeSpan.FromSeconds(seconds), gameTiming);
+        }
+    }
+}