Can you tell me what year my Hotpoint was manufactured by these numbers Mod HDA997-01 Ser MS 625407X

The manufacture date is determined by the serial number. GE manufactures Hotpoint, so the following link explains how to determine the date code:

http://www.fixya.com/support/r3576454-determining_the_age_of_your_ge_appliance

The date of manufacture is determined by the first two LETTERS in the serial number. The first letter represents the MONTH, the second letter represents the YEAR. So, according to the serial number you provided, your dishwasher was manufactured in July of either 1985, 1997, or 2009. If this is a fairly recent model, but not new, I would assume your dishwasher was manufactured in 1997.

I hope this helps you.