It does make me wonder how many bugs like these exist in the average codebase. In this case there was an "unusually large" amount of reports, all coming from th

It does make me wonder how many bugs like these exist in the average codebase. In this case there was an "unusually large" amount of reports, all coming from the same timezone, all filed at the same time. But imagine getting a single bug report, which doesn't provide a timezone or timestamp and essentially boils down to "I swear it said the wrong date yesterday but it fixed itself!": how much time are you really going to spend trying to reproduce it before closing it with the conclusion that the user was probably just imagining things?