Split function daysSinceEpoch from convertTimeToTicks
Split function daysSinceEpoch from convertTimeToTicks

This makes the code more clear, and secondly we will also need a way to compute
the number of days since the epoch in convertTimeFromTicks.

KnightOS/kernel,calcdude84se/knightos-kernel,KnightOS/kernel,unlimitedbacon/kernel