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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You probably want to figure out how to track the time someone joined. This is already pretty difficult, as there is no easy way ingame to get the time of the server, and especially if you also want a date with that time. There is a highly complicated system that involves string parsing, base64 conversion and playerheads to get the actual unix time, but that is about as complicated as it gets in terms of todays available minecraft technology. Not even the people who came up with string parsing really understand it, so I won't even pretend that I know how it works.