Why does Fw.Time have u32 seconds and u32 micros?

[zimri-leisher]

As I work on adding better support for Fw.Time objects to Fpy, I'm wondering why Fw.Time is designed to have a U32 seconds and U32 micros, instead of just U64 micros. Doing the math, U64 micros can represent every single microsecond for the next 500,000 years, whereas U32 seconds and U32 micros can only represent the next 130 years. Most of that is because of the huge amount of redundant ways of specifying epochs. Also, in several places:

fprime/Fw/Time/Time.cpp

Line 141 in 589871a

FW_ASSERT(uSeconds < 1999999);

, it's enforced that the micros can't be more than 1 second total, so you're actually wasting about 12 bits of every Fw.Time object.
It also makes comparison more difficult to perform. I usually just end up converting everything to U64s internally.