Date.valueOf()

Date.valueOf()

Under the covers, the Date object keeps track of time as the number of milliseconds since January 1st, 1970. (This value is also known as a timestamp.) Date.valueOf() returns this value, which is useful for doing math between two Dates.

Here's an example program that keeps track of how long it takes for you to press the button.

start = new Date() button = stamp('button1').tap = stop function stop() {   elapsed = Date.now() - start.valueOf()   text('It took you ' + elapsed + ' milliseconds',50,850)   text('to press the button.',50,900) }