I've made this timer that count down. Here are instructions:
On the right hand side, you have 8 buttons, the odd (1,3,5,7) to count up.
The evens (2,4,6,8) are to reset to 0.
When you ready to start, their is button on the left side.
I may try to have it 1:1 per second but just think of it as lag, sorry.
Enjoy!