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I've went and checked the leagues and it's still shows the last week of 2014:
https://stackexchange.com/leagues/1/week/stackoverflow
https://stackexchange.com/leagues/1/year/stackoverflow
The leagues are usually recalculated at midnight (utc). Is there a reason for that?
The leagues are generated once per day.
The last time they were generated was at midnight and no data for 2015 could have been collected at that point, the league data can only take activity up to that point into account. If only data up to 2014-12-31 23:59:59 can be used, there is nothing to calculate for 2015.
