Flynn referenced George Washington:

My brave fellows, you have done all I asked you to do, and more than can be reasonably expected; but your country is at stake, your wives, your houses and all that you hold dear. You have worn yourselves out with fatigues and hardships, but we know not how to spare you. If you will consent to stay one month longer, you will render that service to the cause of liberty, and to your country, which you probably can never do under any other circumstances. ◦ Encouraging his men to re-enlist in the army (31 December 1776)

One month from Dec 31st is Jan 31st 10 days of darkness is Jan 20th - Jan 30th Light on the 31st?