--- jinja2_time/jinja2_time.py	2022-03-08 08:19:07.405491468 -0600
+++ jinja2_time/jinja2_time.py	2022-03-08 08:19:23.217557370 -0600
@@ -23,7 +23,7 @@
         for param in offset.split(','):
             interval, value = param.split('=')
             replace_params[interval.strip()] = float(operator + value.strip())
-        d = d.replace(**replace_params)
+        d = d.shift(**replace_params)
 
         if datetime_format is None:
             datetime_format = self.environment.datetime_format