# [Calc] Rounding auto-inserted time values

Using Ctrl+Shift+; is great for quickly entering the current time, but it introduces a subtle problem when performing calculations on the values.

Consider a start time and end time entered this way in fields formatted to show HH:MM

```
Start time: 20:11
End time: 20:20
Duration: 00:08 (End time minus Start time)
```

Hold on! Shouldn't the duration should be 00:09?

When I look at the actual figures entered by Ctrl+Shift+;, I see ...

```
Start time: 20:11:48.42
End time: 20:20:26.28
```

and if I reformat the Duration field as HH:MM:SS, I get the result ...

```
Duration: 00:08:37.86
```

... which of course is correct.

So, my question(s):

Is there an easy way to either truncate the Insert Current Time function (Ctrl+Shift+;) so it only inserts HH:MM, *or* what's the easiest way to round that Duration field?