[imglorp]

Past life $work made UTDOA equipment for GSM networks. The hardware used a number of GPS modules from various vendors to obtain GPS time, which someone noted above includes leap offset broadcast in the periodic almanac.

Anyway, of three different module vendors, two got leap handling wrong. Then our own code had its own leap bugs, on top of the OS (Solaris) timekeeping bugs such as clock jumps and timezone update issues. Good times.