Day suffix '_d' conflicts with literal from `date.h` library

[krofik]

Through my project I use this date library and units for all other units I have. The using namespace units::literals; exposes all (?) suffixes into global namespace, and here we have the a conflict inside date::sys_days { 1920_y / jan / 20_d }.

Is there any way to disable literals for specific type? I imagine that as same mechanism as already existing with DISABLE_PREDEFINED_UNITS.

It might go like this:

#define DISABLE_TIME_LITERAL_UNITS
#include <units.h>
using namespace units::literals;
// all literals except units::time are available