For example, today is Sep 19, 2025 [2025-09-19]
If I open the Connect site and navigate to Activities > Steps > 1 Year, I'm taken to this URL: https://connect.garmin.com/modern/steps/2025-09-19/3
I think it should be obvious that 2024 Sep 21 - 2025 Sep 19 is 364 days, but that can also be seen using an online calculator: https://www.timeanddate.com/date/durationresult.html?m1=9&d1=21&y1=2024&m2=9&d2=19&y2=2025&ti=on
If I press the back [<] button next to the date range, it takes me to https://connect.garmin.com/modern/steps/2024-09-20/3 - 2023 Sep 23 - 2024 Sep 20. This is also 364 days, because 2024 was a leap year.
https://www.timeanddate.com/date/durationresult.html?m1=9&d1=23&y1=2023&m2=9&d2=20&y2=2024&ti=on