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% ntpq -c 'rv 0 leap'
Output that includes `leap_add_sec` indicates proper support of the leap second. Before the 24 hours leading up to the leap second, or after the leap second has passed, `leap_none` will be shown.
In practice, leap seconds are usually not a problem on FreeBSD. We hope that this overview helps clarify what to expect and how to make the leap second event proceed more smoothly.