Clock always starts at Midnight, Day 1

Issue: When loading a saved game, the clock starts at midnight of day 1, instead of whenever you saved.
Crash (y/n): n
Platform (Windows/Mac/Linux): All
Description: Start a game and wait a few (in-game) days. Save. Then exit and load that saved game; notice that the clock has returned to midnight of day 1.

(This data just isn’t being saved and restored! How have I missed this for so long?)