Entries in the review log do not record the active timezone

- [ ] - Have a question or feature suggestion?
- [ ] - Problems building/running on your system?

In the statistics anki does not differentiate the hourly analysis according to the time zone, for example, I often swipe flashcards at 11 pm in the China time zone, but when I open the hourly analysis in Japan it shows 11 pm as 12 pm and all the review I did in japan will be mixed up with I reviewed in China. _**(The time difference is not calibrated.)**_

**Usually, we analyze the best time to review according to our biological clock. However, if the time difference is not calibrated, it will have a big bias on the Review success rate for each hour of the day.**

If I study all around the world (like this week in the USA, and next week in Japan), the data will be mixed up and difficult to analyze. (Actually, it is impossible, but just to illustrate the problem with extreme examples)

The best solution may be not only to record the card time when we learned them but also to record the time zone (like [GMT+8],[GMT+1]) or something else.