Berthold Stoeger dd466d2d48 statistics: improve formatting of date axis in day-mode
In January it would just show the year for every day. That's
silly. Show the year only for Jan 1st.

Moreover, it would never show the month, because day-of-month
is counted from 1 (whereas month-of-year is counted from 0).

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
2024-03-31 14:20:14 +02:00
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