Formatting diff date moment js

App Building
1

Hi everyone,
I''m building a mobile app.
In this app, I am trying to set a notification that show the time difference between time 1 (beginning) and time 2 (end). I have succeeded in the calculation but not in the formatting.

To go straight to point

begin. value = 2024-08-21 10:00:00
end.value = 2024-08-21 10:00:50

moment(end.value).diff(begin. Value, 'seconds') -> it shows "the time spent is 50 seconds"

Now i would format this time "HH:mm:ss" to get "the time spent is 00:00:50"

I tried this but shows 01:00:50 instead of "00:00:50" :
moment(moment(end.value).diff(begin. Value, 'seconds') ).format("HH:mm:ss")

What's wrong?
any suggestion?

2

I don't know exactly why, but using UTC seems to make it work
moment.utc(moment(end.value).diff(moment(begin.value))).format("HH:mm:ss")