leap seconds data from https://www.ietf.org/timezones/data/leap-seconds.list
- gh-pages branch serves the json API
- master branch hosts the python code to download and parse data
leap seconds data from IETF
leap seconds data from https://www.ietf.org/timezones/data/leap-seconds.list
leap seconds data from IETF
http://interimm.org/leapseconds/leapseconds.json