I had some local dated rating, and I noticed today that they are off by one.
A one-off error on my end would have been possible, but being consistently off by one was strange.
It turns out that in the lichess graph, the 31st of March doesn't exist for this year, and so all dates in the rating graphs before the 1st of April are off by one.
The European Summer Time switch happened on the 31st of March and involved skipping over one hour, which may be related to this bug.
A one-off error on my end would have been possible, but being consistently off by one was strange.
It turns out that in the lichess graph, the 31st of March doesn't exist for this year, and so all dates in the rating graphs before the 1st of April are off by one.
The European Summer Time switch happened on the 31st of March and involved skipping over one hour, which may be related to this bug.