Thanks, Dean! I thought about doing that, but that would slow the calculation a bit, and thus the calculated second would differ a bit more.

Isn’t there a way to accomplish this by addition (incrementing the time by a second) instead of substraction (decreamenting the time by a second)?

Update

As I have said, after some tests, the average difference from a real second is -0.000003595544834, which is about 0.000003513663706 more than the average difference in the original code.

I know this is still somewhat irrelevant difference, but we need as precise second as we can get, and since the original version of the code is more precise (by that much), this new code does not solve our problem.