Mine automatically resets for every day at midnight. I didn't have to do anything to get it in that mode. It remembers prior days when I sync up. Sometimes I just tap the watch a few times to see how many steps I am at before I post it at night. It shows me days, week, month and year to date, which works out nicely since I got it for Christmas.

There is a "reboot device" under Device and then More, but I never had to do that. I turned off the automatic heartbeat detection because I like to wear it a little loose. They have to be fairly tight against your skin to get the heartbeat right. I hold it in place and tap it to get it in heart beat mode if I want to check it.

So, I made another mistake logging yesterday, but this time it was just 50 calories. I had entered 2 tbs instead of 4 for the PB2 in my morning yogurt, so this morning I entered 6 instead of 4. Makes me wonder how many times I have made mistakes I didn't catch. Tomorrow morning's weigh in will be interesting; I felt real good about getting a new low reading 3 days ago, but then yesterday I had it jump up over 2 pounds. That was almost certainly water and the extra food (bowl of oatmeal I forgot to log), but it made me a little nervous about my new calorie goal. I probably shouldn't worry; I doubt I would have seen that lowest reading if it was too much.