From the datetimes extracted for each revid of an article, conduct an analysis to find mean, median and std dev of the dates.

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I converted all dates to Julian dates (inspiration from here https://github.com/phn/jdcal) and found the mean. (I ignored the time though)

I am now working on finding the median in an efficient manner. A search suggested that https://en.wikipedia.org/wiki/Median_of_medians and https://en.wikipedia.org/wiki/Selection_algorithm work in O(n) time.