Confirmation Letter Format - appoint letter date & joining date both are necessary?

If employee joined in November & from January we made few changes in policy like made changes in leaves, probation time period .
Then whats the format for confirmation letter in that condition . Please help its urgent

Date:__________
Dear Mr / Ms ______
Subject: Confirmation Letter
We are glad to inform you that you have been confirmed to the position of (designation) with effect from (confirmation date). Your salary has been revised to (Rs.in words) per month with effect from the confirmation date which indicates the cost to company and other benefits.
All other term and conditions as detailed in your appointment letter remain unchanged.
We sincerely look forward to your association and are confident that you will use the opportunity with (company name)for further improving the growth of your career.
Congratulations on your continuous success.
Regards,
___________
Your name
Regards,
Dharna Sharma

Date-----
Name
Emp Code
Dept
Dear (Name)
The Management is pleased to inform you that your services have been confirmed in category of (e.g -Executive/Manager) and new salary structure mention below with effect from date(day/Month/year)
Basic=000
HRD =000
Other=000
Total =000
we are sure that you will continue to put in even batter efforts so as to contribute to growth of the company.
All other terms and condition of your appointment will remain same as per our latter dated (date of appointment latter)
For xyz ltd

Dear Sir,

Please share staff employee confirmation format