"Day Sequence" is 1 Reinforcements, 2 Place order discs, 3 Player actions phase and 4 End of day - but - Phase four: End of day states "The player action phase ends when the Union player has removed his last order disc or Forced Pass disc from his Available Orders box." which happens at the end of every time period (Morning, Mid-day, Afternoon, Night).
The instructions also state "At the end of the night-time period a new day begins. The Day marker should be moved on one space. The game will effectively end at the end of the afternoon period of the third day, if it does not end earlier." which to me confirms end of day is different to phase 4 end of day which to me would be better if it read end of period.