使用PHP输出事件列表以及时间戳

I have 3 tables in my PHPMyAdmin

1. brand
2. item
3. model

I am developing a PHP website that can be used to stock management. So basically the user can use it to input an item and display it along with the price and quantity.

So take an example, today I add in an item with

1. brand : A
2. model: B
3. quantity: 5
4. price : 123

and tomorrow I lessen the quantity by 1

and again in the other day I lessen the quantity by 1

And what I want is how to create a page that can be used to display all the events along with the time stamp??

it would be like this :

2014-09-19 brand A quantity -1

2014-09-20 brand A quantity -1

2014-09-21 brand A quantity -1

I already put the date into the model table, but it can only give the timestamp from the last event occurred

can anybody help me?