dart - Flutter Countdown Timer - Stack Overflow
countDownFormatter: the way user wants to display the count down timer e. g hh mm ss string like 01 hours: 20 minutes: 45 seconds; you can provide a default formatter ( formatHHMMSS) in case you dont want to supply it from every place. provide implementation for this - formatHHMMSS(duration. inSeconds); or use below one which I have provided.
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