WatchOS countdown timer time selection

I'm new to this, so please forgive the no-doubt inane question...

I'm creating a simple countdown timer app, and I want to be able to select the start time using a picker. How do I set the starting time interval according to the selected option in the picker? For the life of me I can't find a tutorial that clarifies it for me. Perhaps someone can point me in the right direction, or provide a code snippet to get me going. Thanks...

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