I just added 5 minutes to my goal via the web UI, https://www.beeminder.com/adba/ja#data
Weirdly, the dropdown (Enter data -> Date:) insists that today is December 2nd, and that yesterday was December 1st.
The timezone in my profile is set correctly and matches the timezone on the device I entered the data on. It won’t be the 2nd for several more hours.
I manually changed the date of the entry, but it’s extra friction to have the default date be wrong.