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# Reference
+1. [Calendarific: Worldwide Holidays and Observances RESTful API](https://calendarific.com/)
+1. [UTC with Smoothed Leap Seconds (UTC-SLS)](https://www.cl.cam.ac.uk/~mgk25/time/utc-sls/)
+1. [Hashed and Hierarchical Timing Wheels](https://paulcavallaro.com/blog/hashed-and-hierarchical-timing-wheels/)
1. [Storing UTC is not a silver bullet](https://codeblog.jonskeet.uk/2019/03/27/storing-utc-is-not-a-silver-bullet/)