This sounds like you aren't reliant on an external arbiter for your streak calculation, it's just between you and the calendar with crossed-off dates. That bei

This sounds like you aren't reliant on an external arbiter for your streak calculation, it's just between you and the calendar with crossed-off dates. That being the case, you can implement your own algorithm and go with it. I'm interpreting what you have said as that you won't (and do not want to) rationalize your way to the answer you like. Same as how I calculate my "benchmark" weight: there's a bit of latitude in saying "oh, that's an outlier", but the process (essentially a moving average) is immune to most things short of outright fabrication, and I can't self-deceive about that.