--- a/python/moving.py	Thu Mar 03 14:31:13 2016 -0500
+++ b/python/moving.py	Thu Mar 03 17:01:30 2016 -0500
@@ -61,6 +61,10 @@
         '''Indicates if the temporal interval of self is comprised in interval2'''
         return (self.first >= interval2.first) and (self.last <= interval2.last)
 
+    def shift(self, offset):
+        self.first += offset
+        self.last += offset
+
     @classmethod
     def union(cls, interval1, interval2):
         '''Smallest interval comprising self and interval2'''
@@ -174,6 +178,9 @@
     def commonTimeInterval(self, obj2):
         return TimeInterval.intersection(self.getTimeInterval(), obj2.getTimeInterval())
 
+    def shiftTimeInterval(self, offset):
+        self.timeInterval.shift(offset)
+
 class Point(object):
     def __init__(self, x, y):
         self.x = x