If you ever encountered a problem with monitoring your server's activity, you might be interested in this modification. This mod uses Google Spreadsheets API to automatically log every player's logins and logouts, calculates individual session timeframes and shows this information in an easy and comfort way.
After successful initialization you can start tracking your players' playtime activity. Go to the Google Spreadsheets, authorize with your Google account and search for "Playtime Logger" spreadsheet (the name might be different if you replaced it in the config file). There you will see two sheets:
This project is available under the MIT license. Feel free to learn from it and incorporate it in your own projects.

This mod logs players' playtime on the server using Google Spreadsheets API. Useful for monitoring server's active player base.