UE4 only has no support for high precision numbers in it’s blueprint system, this has been the case for years. It makes developing in the engine orders of magnitude harder than it has to be and requires you add computation to work around these issues.
Tasks like storing time since epoch should be trivial, but if you in anyway interact with Blueprints then it becomes next to impossible to avoid precision issues as at the point of input you are limited to floats and 32-bit integers.
Does Epic intend to add support for more types within the engine? I’ve seen “We’ve talked about it” posts that are SIX years old and counting.