Hello, today I noticed a change in the calendar showing my activity on Codeforces. More specifically, March 20, 2021 was marked white though I remember solving 1 problem that day. When I checked out the list of my submissions, I noticed that the submission I made at 23:52, March 20, has changed to 00:52, March 21, because the clock moved 1 hour forward last night (at least in the countries with Daylight saving time, including my country). So, I was wondering if it’s possible to make a change such that the time of previous submissions always stays the same (doesn’t change when the clock is moved). As I'm not really familiar with the way the submission time is currently determined, I don't know how hard it would be to make such a change, so, if you know more about it, please let me know in the comments. Feel free to express your opinions on the matter in the comments!