On Mon, Feb 26, 2018 at 11:56:42AM +0100, Andreas Krey wrote: > > The bigger issue is usually to copy with those pesky leap seconds. It > > makes a difference whether one uses solar seconds ("posix" style; those > > are more commonly seen) or atomic seconds ("right" style) for the UNIX > > timestamp. > > Is there any system, unix or otherwise, that uses 'right'-style seconds, > i.e. TAI, as its base? Most certainly there is. This depends on the individual configuration of the system. On my Fedora system, the commonly used tzdata package off the shelf contains support for 'right' style versions of all timezones in /usr/share/zoneinfo/right If the user links one of those timezones to /etc/localtime or manually specifies them (like TZ=right/Europe/Berlin ls -l) they will be used. You don't find a lot of those systems today, but those who used to use the 'right' timestamps might for legacy reasons explicitly configure their system to use those timezone variants. I personally did this for a number of years, but then converted the filesystems timestamps to 'posix' and I am now exclusively using 'posix' ones. Best wishes Peter -- Peter Backes, rtc@xxxxxxxxxxxxxxxxxxx