Implement timeShift

pkg/timeseries/transform_functions.go

@@ -1,5 +1,7 @@
 package timeseries
 
+import "time"
+
 func TransformScale(factor float64) TransformFunc {
 	return func(point TimePoint) TimePoint {
 		return transformScale(point, factor)
@@ -12,6 +14,12 @@ func TransformOffset(offset float64) TransformFunc {
 	}
 }
 
+func TransformShiftTime(interval time.Duration) TransformFunc {
+	return func(point TimePoint) TimePoint {
+		return transformShiftTime(point, interval)
+	}
+}
+
 func transformScale(point TimePoint, factor float64) TimePoint {
 	if point.Value != nil {
 		newValue := *point.Value * factor
@@ -27,3 +35,9 @@ func transformOffset(point TimePoint, offset float64) TimePoint {
 	}
 	return point
 }
+
+func transformShiftTime(point TimePoint, interval time.Duration) TimePoint {
+	shiftedTime := point.Time.Add(interval)
+	point.Time = shiftedTime
+	return point
+}