New URL for leap-seconds.list file

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jeff.s...@nist.gov

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Jun 5, 2026, 6:48:07 PMJun 5
to Internet-time-service
Dear colleagues,

NIST's leap-seconds.list text file, required by some NTP clients and other software, is now available at the following URLs:

https://tf.nist.gov/leap-seconds.list
http://tf.nist.gov/leap-seconds.list

There is no recent change to the substantive content of the leap second table, and no upcoming leap second is currently forecasted.

Some frequently asked questions and answers about leap seconds are available here:
https://www.nist.gov/pml/time-and-frequency-division/leap-seconds-faqs

Sincerely,
--Jeff Sherman
Project email: internet-t...@nist.gov
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