I'd like to request that the "Estimated Time Of Arrival" capability be supported.
The capability has a single 'eta' attribute which is an ISO 8601 date so any implementation might like to allow a date format string to be specified.
The ETA has a wide variety of potential uses. There could ETAs for people. There could be ETAs of buses at stops, trains at stations, and planes at airports. There could be broader interpretations such as next appointments or medication times.
Basically it can be used for anything that needs a date and time and it is an 'official' capability.
Customer support service by UserEcho