Open Radar

 
The default WLKInterfaceTimer class does not have an option to display milliseconds in the label for the given date as either a count down or count up timer. It also doesn't support a custom date format string, so the option to add this information isn't there.

The WKInterfaceDate actually does support a custom date format string, so supplying a format string that includes milliseconds actually is an option. However, when you supply milliseconds to the format string, the millisecond value is not updated. The WKInterfaceDate control's internal timer seems to be firing once per second, which means it can't update the label's contents on a millisecond basis anyway. 

I'd really like to see millisecond support because it creates a more accurate and better overall experience for runners to gauge their speed and run duration. It's also just a better visual experience to feel like the watch is actually working if the user can see milliseconds counting up. Without that, it feels like the watch is running slow, or that the user is running slow. I do understand the power tradeoffs involved with timers firing at shorter intervals to make this possible, and I know it's not ideal, but some support for it in at least a limited fashion would be nice to have.