Make a way to use local device's leap second information #61
Description
This is the last step discussed in #49 (comment) . To summarize, now that #58 has provide a possible leap second interface (although emphasis on "possible" because of #61), we should figure out a way to implement @olebole's idea in #49 (comment), which is also connected with @nikkelj and @rmathar's ideas in #43.
Perhaps @rmathar's code in #43 (comment) can be recycled here?