Streak calculations (Timezone dependant?)

[maelm-Epita]

Checklist

• I've verified that I use the latest version of the add-on by redownloading it from AnkiWeb
• I've verified that I use the latest version of Anki by checking at https://apps.ankiweb.net#download
• I've checked if anyone else asked this question before by looking through the issue reports.

Your question

How is the streak calculated? Does it depend on timezone? After coming back from a trip in a country with a vastly different timezone, my streak got butchered and now i have a bunch of empty days where I used to have a continuous streak.
Is there any way to fix this behavior? The only way I could think of was to manually edit review times in anki's database.
Is there any particular reason why streak data has to be recalculated dynamically every time, instead of storing data in a file (making it impossible for time changes to retroactively break streaks)?

Edit

For now I was able to get my streak back by manually changing the "Next day starts at" option in Anki, but this is obviously not ideal IMO.

Thank you.

[david-resnick]

I think you are right, changes in timezone skew some statistics now. It also messes up the "Hourly Breakdown" graph.

I mentioned this here, with the solution I used to change the revlog entries.