I've not seen any mention of this here, so it might be off-topic, if
so, sorry in advance. If you use GPS for time synchronization, this
might be important. The Juniper
ACX500 series and the Cisco 819 both have an embedded GPS
receivers, for example.
At 23:59:42 UTC on 4/6/2019 (Midnight GPS time, which differs by
18 leap-seconds from
UTC) , the 10-bit GPS Week Number broadcast by the constellation
will reset to zero for the second time since the beginning of GPS
on 1/6/1980.
Ken
--
GPS Week Number Rollover (WNRO)