Assume that you are the president of Gaslight company. At the end of the year (December 31, 2011 of operation.

To answer this question, we need to assume certain variables. First, we need to know the starting date of operation for Gaslight company. Next, we need to know the duration of the company's operation, which needs to be specified as the number of years, months, and days.

Let's assume the following information:
- Starting date of operation: January 1, 2011
- Duration of operation: 1 year

Now, to determine the end date of operation, we can use the starting date and the duration.

Starting date: January 1, 2011
Duration of operation: 1 year

To calculate the end date, we start by adding the duration of operation to the starting date:
January 1, 2011 + 1 year = January 1, 2012

Now, since the question specifically asks for the end of operation, we subtract one day from the end date to get December 31, 2011:
January 1, 2012 - 1 day = December 31, 2011

Therefore, based on the given assumptions, the end of operation for Gaslight company would be December 31, 2011.