to within the range of chrono::minutes.
* This prevents overflow when adding minutes to day_point
when minutes is stored in 32 bits.
* Also added static checks on the range of hours and seconds.
If these static checks fire, the range of year should be
further reduced.
* This does not impact gcc at all. It impacts clang only
when targeting 32 bit architectures. And it fixes
overflow on Visual Studio.
* Thanks much to https://github.com/gmcode for the herculean
effort in tracking this down.
