Example https://stats.wikimedia.org/v2/#/es.wikipedia.org/contributing/edits
If I select 'one month' I see date range Nov 18-30
If I select 'one year' I see January to November
'Two years' seems to show 23 months, but even verifying that takes another look as first and last month are not consistently shown on the x-axis.
Also does time range in '17.31% over this time range.' report on shown period or actually requested period?
Closing as many bugs have been fixed on time selector since this one was filed, one month range is now correct: https://stats.wikimedia.org/v2/#/all-projects/contributing/edits/normal|bar|1-Month|~total
1 year time range displays 12 months back into the past: https://stats.wikimedia.org/v2/#/all-projects/contributing/edits/normal|bar|1-Year|~total
2 year time range displays 24 months: https://stats.wikimedia.org/v2/#/all-projects/contributing/edits/normal|bar|2-Year|~total