> There has never been a negative leap second. That doesn't stop the (e.g.) FreeBSD folks run tests to make sure things are fine: * https://lists.freebsd.org/

> There has never been a negative leap second. That doesn't stop the (e.g.) FreeBSD folks run tests to make sure things are fine: * https://lists.freebsd.org/pipermail/freebsd-stable/2020-November/092837.html https://lists.freebsd.org/pipermail/freebsd-stable/2020-Nove... * https://docs.freebsd.org/en/articles/leap-seconds/ https://docs.freebsd.org/en/articles/leap-seconds/ Of course there's a whole lot of other userland code besides ntpd.