tuxduino:
When the code enters an ISR interrupts are automatically disabled.
And automatically re-enabled when the ISR ends.
Also, how are you going to measure this bounce guard time, if interrupts are disabled hence millis() can't advance ?
The trick is to only disable the relevant interrupt vector (external interrupt or pin-change interrupt). Using external debounce-circuits with microcontrollers went out of fashion 20 years ago.- This thread can serve as good example why that is.