code: async def dateadd(request, value, addend, unit):
      
      value = value or dt.datetime.utcnow()
      if unit == "minutes":
          delta = dt.timedelta(minutes=addend)
      else:
          delta = dt.timedelta(days=addend)
      result = value + delta
      return json_response({"result": result.isoformat()})
docs: A datetime adder endpoint.