diff --git a/src/scripting/Elsa.Scripting.JavaScript/Handlers/ConfigureJavaScriptEngineWithDateTimeFeatures.cs b/src/scripting/Elsa.Scripting.JavaScript/Handlers/ConfigureJavaScriptEngineWithDateTimeFeatures.cs
index 2aaa0409c..2b49b0cbd 100644
--- a/src/scripting/Elsa.Scripting.JavaScript/Handlers/ConfigureJavaScriptEngineWithDateTimeFeatures.cs
+++ b/src/scripting/Elsa.Scripting.JavaScript/Handlers/ConfigureJavaScriptEngineWithDateTimeFeatures.cs
@@ -24,6 +24,10 @@ namespace Elsa.Scripting.JavaScript.Handlers
             engine.SetValue(
                 "instantFromDateTimeUtc",
                 (Func<DateTime, Instant>) Instant.FromDateTimeUtc);
+            
+            engine.SetValue(
+                "instantFromUtc",
+                (Func<int, int, int, int, int, int, Instant>) Instant.FromUtc);
 
             engine.SetValue(
                 "currentInstant",
@@ -55,12 +59,12 @@ namespace Elsa.Scripting.JavaScript.Handlers
             );
 
             engine.SetValue(
-                "plus",
+                "addDurationTo",
                 (Func<Instant, Duration, Instant>) ((instant, duration) => instant.Plus(duration))
             );
 
             engine.SetValue(
-                "minus",
+                "subtractDurationFrom",
                 (Func<Instant, Duration, Instant>) ((instant, duration) => instant.Minus(duration))
             );
 
@@ -86,7 +90,7 @@ namespace Elsa.Scripting.JavaScript.Handlers
 
             engine.SetValue(
                 "formatInstant",
-                (Func<Instant, string, CultureInfo, string>) ((instant, format, cultureInfo) =>
+                (Func<Instant, string, CultureInfo?, string>) ((instant, format, cultureInfo) =>
                     instant.ToString(format, cultureInfo ?? CultureInfo.InvariantCulture))
             );
 
@@ -99,18 +103,30 @@ namespace Elsa.Scripting.JavaScript.Handlers
                 "instantFromLocalDate",
                 (Func<LocalDate, Instant>) (value => value.AtStartOfDayInZone(DateTimeZone.Utc).ToInstant())
             );
+            
+            engine.SetValue(
+                "durationBetween",
+                (Func<Instant, Instant, Duration>) ((a, b) => a - b)
+            );
+            
+            engine.SetValue(
+                "periodFromNow",
+                (Func<Instant, Period>) GetPeriodFromNow
+            );
 
             return Task.CompletedTask;
         }
 
-        private LocalDateTime GetStartOfMonth(Instant instant)
+        private LocalDateTime GetStartOfMonth(Instant instant) => GetStartOfMonth(instant.InUtc().LocalDateTime);
+        private LocalDateTime GetStartOfMonth(LocalDateTime localDateTime) => localDateTime.With(DateAdjusters.StartOfMonth);
+        
+        private Period GetPeriodFromNow(Instant pastInstant)
         {
-            return GetStartOfMonth(instant.InUtc().LocalDateTime);
-        }
-
-        private LocalDateTime GetStartOfMonth(LocalDateTime localDateTime)
-        {
-            return localDateTime.With(DateAdjusters.StartOfMonth);
+            var now = _clock.GetCurrentInstant();
+            var today = now.InUtc().Date;
+            var pastDate = pastInstant.InUtc().Date;
+            var period = Period.Between(pastDate, today);
+            return period;
         }
     }
 }
\ No newline at end of file
diff --git a/src/scripting/Elsa.Scripting.JavaScript/Handlers/RenderJavaScriptDateTimeTypeDefinitions.cs b/src/scripting/Elsa.Scripting.JavaScript/Handlers/RenderJavaScriptDateTimeTypeDefinitions.cs
new file mode 100644
index 000000000..9798f5008
--- /dev/null
+++ b/src/scripting/Elsa.Scripting.JavaScript/Handlers/RenderJavaScriptDateTimeTypeDefinitions.cs
@@ -0,0 +1,42 @@
+using System.Threading;
+using System.Threading.Tasks;
+using Elsa.Scripting.JavaScript.Events;
+using Elsa.Services;
+using MediatR;
+
+namespace Elsa.Scripting.JavaScript.Handlers
+{
+    public class RenderJavaScriptDateTimeTypeDefinitions : INotificationHandler<RenderingTypeScriptDefinitions>
+    {
+        private readonly IActivityTypeService _activityTypeService;
+
+        public RenderJavaScriptDateTimeTypeDefinitions(IActivityTypeService activityTypeService)
+        {
+            _activityTypeService = activityTypeService;
+        }
+
+        public async Task Handle(RenderingTypeScriptDefinitions notification, CancellationToken cancellationToken)
+        {
+            var output = notification.Output;
+
+            output.AppendLine("declare function instantFromDateTimeUtc(dateTime: DateTime): Instant");
+            output.AppendLine("declare function instantFromUtc(year: number, month: number, day: number, hour?: number, minute?: number, second?: number): Instant");
+            output.AppendLine("declare function currentInstant(): Instant;");
+            output.AppendLine("declare function currentYear(): number;");
+            output.AppendLine("declare function startOfMonth(instant?: Instant): LocalDate;");
+            output.AppendLine("declare function endOfMonth(instant?: Instant): LocalDate;");
+            output.AppendLine("declare function startOfPreviousMonth(instant?: Instant): LocalDate;");
+            output.AppendLine("declare function addDurationTo(instant: Instant, duration: Duration): Instant;");
+            output.AppendLine("declare function subtractDurationFrom(instant: Instant, duration: Duration): Instant;");
+            output.AppendLine("declare function durationFromSeconds(seconds: number): Duration;");
+            output.AppendLine("declare function durationFromMinutes(minutes: number): Duration;");
+            output.AppendLine("declare function durationFromHours(hours: number): Duration;");
+            output.AppendLine("declare function durationFromDays(days: number): Duration;");
+            output.AppendLine("declare function formatInstant(instant: Instant, format: string, culture?: CultureInfo): string;");
+            output.AppendLine("declare function localDateFromInstant(instant: Instant): LocalDate;");
+            output.AppendLine("declare function instantFromLocalDate(localDate: LocalDate): LocalDate;");
+            output.AppendLine("declare function durationBetween(a: Instant, b: Instant): Duration;");
+            output.AppendLine("declare function periodFromNow(pastInstant: Instant): Period;");
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/scripting/Elsa.Scripting.JavaScript/Handlers/RenderJavaScriptTypeDefinitions.cs b/src/scripting/Elsa.Scripting.JavaScript/Handlers/RenderJavaScriptTypeDefinitions.cs
index 5caece7c4..095b05ebb 100644
--- a/src/scripting/Elsa.Scripting.JavaScript/Handlers/RenderJavaScriptTypeDefinitions.cs
+++ b/src/scripting/Elsa.Scripting.JavaScript/Handlers/RenderJavaScriptTypeDefinitions.cs
@@ -13,12 +13,10 @@ namespace Elsa.Scripting.JavaScript.Handlers
 {
     public class RenderJavaScriptTypeDefinitions : INotificationHandler<RenderingTypeScriptDefinitions>
     {
-        private readonly IConfiguration _configuration;
         private readonly IActivityTypeService _activityTypeService;
 
-        public RenderJavaScriptTypeDefinitions(IConfiguration configuration, IActivityTypeService activityTypeService)
+        public RenderJavaScriptTypeDefinitions(IActivityTypeService activityTypeService)
         {
-            _configuration = configuration;
             _activityTypeService = activityTypeService;
         }