Library for time zone conversions and automatic DST adjustments

Hey - Great library. This just saved me a lot of work.

However...
When I convert the current UTC time to local, then display it, the year is coming out as 47 rather than 2017, a difference of 1970 years.
I know time_t is based at 1970, but shouldn't this already be accounted for rather than having to use tm.Year+1970?

Thanks!