java - How to start decreasing a duration stored in Firebase as string? Please see details -

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i'm developing android app , have opted users choose duration , store on firebase string this:

hms = string.format("%02d:%02d:%02d", timeunit.milliseconds.tohours(duration),                     timeunit.milliseconds.tominutes(duration) % timeunit.hours.tominutes(1),                     timeunit.milliseconds.toseconds(duration) % timeunit.minutes.toseconds(1));

it getting saved 1:30:00.

now, retrieving firebase , showing user want show decreasing duration.

how can that?

please let me know.


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