the maps relesed by GPS providers can be upto a year old, it is never the date they state it is.
After HERE supply map data to providers it takes a minimum of 3 months to convert the files then another 2 months to compile the maps before they are released. It can take anything from 3 months to 1 year for maps to come into public use. So even if your map days says 2017 there is a very good chance it could be late 2015/early 2016 map data your viewing.
2017 Q2 maps will be data from roughly March 2016 or earlier.