pxt-calliope/docs/reference/input/running-time.md

# Running Time

Find how long it has been since the program started.

```sig
input.runningTime();
```

### Returns

* the [Number](/reference/types/number) of milliseconds since the program started.
(One second is 1000 milliseconds.)

### Example: elapsed time

When you press button `B` on the microbit, this
program finds the number of milliseconds since the program started
and shows it on the [LED screen](/device/screen).

```blocks
input.onButtonPressed(Button.B, () => {
    let now = input.runningTime()
    basic.showNumber(now)
})
```

### Lessons

[speed button](/lessons/speed-button)

### See also

[show number](/reference/basic/show-number), [pause](/reference/basic/pause)