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This is a follow-up question to original Prorated Refund Calculator. Here is the summary of the changes I made since last, thanks to the good answers and some study of my own.

This is a follow-up question to original Prorated Refund Calculator. Here is the summary of the changes I made since last, thanks to the good answers and some study of my own.

• Did away with bleeding-edge ECMAScript 6 code that was causing compatibility issues with some browsers.
• Added more input validation;
• Added a utility function to format dates to MM/DD/YYYY format;
• Input values are now obtained using getElementById instead of getting them from a numbered list;
• Output is appended into the existing page, rather than updating placeholder HTML tags;
• Documentation throughout;
• Output is more comprehensive and user-friendly.

• Did away with bleeding-edge ECMAScript 6 code that was causing compatibility issues with some browsers.
• Added more input validation.
• Added a utility function to format dates to MM/DD/YYYY format.
• Input values are now obtained using getElementById instead of getting them from a numbered list.
• Output is appended into the existing page, rather than updating placeholder HTML tags.
• Documentation throughout.
• Output is more comprehensive and user-friendly.

Samples output:

Sample input:

Product Purchase date: 6/1/2013
Contract Purchase date: 1/15/2014
Purchase Price: 699
Term (in years): 10
Cancel date: 07/13/2015
Paid in claims: 147
Grace period: 60

Resulting output: