GitHub user sebbASF opened an issue:
https://github.com/apache/incubator-ponymail/issues/409
Bug: stats.lua should use UTC for calculating year and month
stats.lua currently uses localtime for calculating the year and month from
a timestamp.
If the timestamp happens to be close to midnight when a month or year
change, the calculation may vary for different locales.
The code should use UTC for the calculations
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