Time is out of sync when changing unit

there seems to be an issue where when changing `unit`.

Looking at the video timestamp here: https://youtu.be/jvab9FTn2vI?list=PLS8HfBXv9ZWVp2SDHU-Y_MfCZHvCUZlgm&t=191
when the time flips to 19:30:00 you speak for about 10 seconds before moving the slider down to seconds. the next time step emitted is then 19:30:01.