How to design for 0hrs 0mins countdown timer as default (indicating timer not set).

In my app, its optional that a user sets a timer for a given thing. For that, I wanted to show 0hrs and 0 mins as default selected time interval of the countdown timer. if there is a change, the timer is automatically set to that value using event handling (did end editing).

However, 0hrs and 1 mins is what the default timer shows which can come across as the timer being preset to 1 minute. How can I design my user-interface such that the default is indicated as 0hr 0mins and if the user changes it, its set to that time.

This is more of a design question. Maybe something in HIG?

Here is how it currently looks...

How to design for 0hrs 0mins countdown timer as default (indicating timer not set).
 
 
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