In order to display the stopwatch time in seconds, we'll 0:00 do one final calculation that converts the elapsedTime in milliseconds to seconds. 0:03 For instance, if I display the time in render method with the jsx 0:07 expression this.state.elapsedTime, and click the Start button. 0:12 We see the time updating at 1,000 milliseconds per second. 0:17 To get the value in seconds, we need to divide elapsedTime by 1,000. 0:21 So inside the expression, 0:26 I'll write Math.floor to round the value down to its nearest integer. 0:28 That way we don't get a decimal value, 0:33 then divide this.state.elapsedTime by 1,000. 0:35 Back in the stopwatch, when I click the Start button, 0:39 we see the timer taking in seconds. 0:44 If I click Stop, the timer stops, and 0:47 clicking Start continues the timer from where it left off, good. 0:50 Sometimes the return statement holding our JSX can get messy with too many 0:54 expressions and logic. 0:58 When this happens, our code could become difficult to read, debug, and maintain. 0:59 Now, in our case, this isn't really an issue, but I'm going to make the code just 1:04 a little more organized by storing the Math.floor function and 1:08 calculation in a variable. 1:11 In the render method, 1:12 any intermediary variables should be written outside the return statement. 1:14 So I'll create a variable seconds, assign it the math.floor function, 1:18 then in the JSX expression, call the seconds variable. 1:26 Next, we'll wire up the Reset button to a function that resets 1:32 the stopwatch back to 0, this should be pretty straightforward. 1:37 Let's create a new function named handleReset. 1:42 In this function, we'll use this.setState to set the elapsedTime state back to 0. 1:51 And I won't update the is running state here because I 2:00 don't want to stop the timer when a user clicks Reset. 2:03 I'll keep the reset logic independent of the start and stop logic. 2:05 Finally, let's add an onClick event to the Reset button. 2:09 This onClick event needs to call the handleReset function, 2:14 so let's pass it this.handleReset. 2:18 Over in the browser, let's Start the stopwatch. 2:21 Now you can Stop it and Start it again, click Reset, and 2:26 it resets to 0 but continues to tick. 2:31 If you click Stop, you're able to reset it while stopped, then Start it up again. 2:34 All right, nice, now we have a functioning stopwatch. 2:43