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

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# Running Time
Find how long it has been since the program started in milli-seconds.
```sig
input.runningTime();
```
## Returns
* the [Number](/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)
})
```
## See also
[show number](/reference/basic/show-number), [pause](/reference/basic/pause)