> What does the time zone package have to do with UTC? The IANA TZ database includes information about leap seconds, and even supports the concept of "right" t

> What does the time zone package have to do with UTC? The IANA TZ database includes information about leap seconds, and even supports the concept of "right" time zones in which the leap seconds are counted in the Unix timestamps. (Which violates the unix spec, and may cause problems with code that assumes it can do path like `1 day= 24*60*60`, but on the other hand, things like DST already make that unsafe). It is mostly likely simply the case that they are using the leap second data from the time-zone database as a convenient source of this data.