Here’s an interesting “bug” for you… A little while ago Geocaching.com made a slight change to the way dates and times are stored in GPX files. They all get stored in UTC time whereas older GPX files stored it with no timezone, just whatever time and date a log got saved.
It seems like when you submit logs to Geocaching.com via an iPhone it gets a bit muddled with the time/date. I’ve noticed that some caches I’ve submitted late afternoon appear in my log list before those submitted early morning for example. After our visit to Nottingham I generated a finds query and noticed that it said we had 79 finds for one day (19th September) when I knew we’d found 59.
I thought I’d done the logs wrong, but the Geocaching.com site listed the correct dates for my submissions.
I then checked the .GPX file and it was showing the log time for caches I’d logged on 18th Sept as found on 19th Sept.
So if you noticed a few waffy stats when you come to generate yours and you have logged via the Geocaching mobile app then the timezone is the reason for it. The quick (Or rather not quick) fix is to go into each log, edit it, change the date, go back into the log, edit the date back to what it originally was and it should now show the right found date in your .gpx files.