please help....its about the saving data load it in a form of pie...line and bar for weeks , day and months

Question

For this assignment you must add the following functionality:

• Save the information to a file
• Load the information from a file 
• Draw several graphs to illustrate some statistics

Each month a new file must be created to store the information of that month. The information must be stored in the following format: Date, Activity, Total_Time

Note: Total_Time is the total time for that day only!

When loading data remember that only on day's data can be displayed at a time. However data from multiple dates are required for the statistics.

You will need to create a means for the user to clear the grid.

The following statistical data needs to be calculated and displayed in the indicated chart format:

• The amount hours spent on a all activities on a specific day, as a pie chart
• The average amount of time spent in a specific week on each activity, as a bar chart· 
• The total time per week for each activity over a 4 week period, as a line (or XY scatter) chart.