auto insert date when anothe field is changed.

On my form have a status field with about 7 options to choose from a combo box, i have these values set in another table. What i would like is for my other field, which is a date, to automatically change whenever the status field is changed. So i know how long ago the status field was set. So basically if i change the status to complete i want the date to then set the date and time now.

Can anyone help?

Thanks

auto insert date when anothe field is changed.