Time format option

For now, we are following system!

I'd say let the user customize it. Here I use the 24-hour clock system on iOS, so, for example, Spark and Epistles Mail shows me the time that way. But on Newton, even though I have it set up that way on iOS, it displays it with AM/PM.

Should we just follow the system format, or would you prefer having an option to manually select the clock format from settings?