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Server calendar in Online Activity Overview Network page shows incorrect data #1239
It looks like the issue is limited to the calendar and the graph and other times are correct, while calendar is delayed by one day.
There is likely some logic mistake that is related to negative timezone offset that causes the days to be grouped on the previous day, I'll take a look at it when I have the time
I found out the cause of the issue and why it doesn't occur with GMT +X timezones
In GMT +12 formatting to ISO-8601 (yyyy-MM-dd) does not roll to the next day, but in -1 it does roll to the previous day