Modifying Millis() function

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hi,

i have problem modifying millis() while refering blinkwithoutdelay example. understand example uses millis() function. millis() command returns number of milliseconds since board started running current sketch.

however, modify millis() , want command return number of millisecond since press button.

how do it? there in-built arduino function can help?

sorry, still new programming.

why want modify function upon else depends?
don't want build upon instead?


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