Almost nobody ever cares for UT1 except for astronomical observations (where you are also likely using a different calendar and using sidereal days) and we alre

Almost nobody ever cares for UT1 except for astronomical observations (where you are also likely using a different calendar and using sidereal days) and we already have a perfectly working system for relating local times to each other and to UTC: timezones. The only things we should care about are local time (both as in clock time and in sun-position time) and universal timestamps to coordinate between local times and to use as canonical representations; leap seconds are useless or damaging to both of these. We already easily accept over 60 minutes of offset between clock time and sun-position time and I do not think that 3600 seconds can be ok but 3601 or 3599 cannot. It is also perfectly easy for a country to change its timezones or to adapt a non-whole-hour timezone (multiple countries have 15 or 30 minutes offsets) So my proposal is that the IERS never announces any leap anything ever again and in a few centuries some countries will shift their timezone by 15 or 30 minutes. This will be much more easily compatible with all current systems (we can right now create the timezone CETP and CETM for central European time plus 15 and minus 15) and in 400 years each at they leisure Europe/Berlin will be equivalent to CETM* (and CESTM if have failed to remove DST). No need to handle irregular minutes or hours, no fractional seconds offsets, no need to account for edge cases that are far too easy to ignore, just keep writing code that work with timezones (as you should already be doing) do not hardcode conversion between regional timezones (Europe/Berlin) and offsets (CET, CEST, CETM) as you should already be doing just updating your timezone tables (as you should already be doing as they change often). Just store one of: - UTC and timezone - dateless time with/without timezone - date with no time with/without timezone And you are ok, already prepared for the next few centuries of no leap seconds. * I don't know whether it would be CETM (that is +00:45) or CETP (+01:15).