[stylin19a]

Within the storeroom was a calendar and they had crossed off every day that they had been alive – 16 days had been crossed off using a red pencil.

haunting is right. I wonder how they had any concept of time.

[knittnmom]

I don’t know for sure, but I would suppose they had watches that were wound to keep them running. https://en.wikipedia.org/wiki/History_of_watches has a section on wristwatches and the military, but I didn’t find anything more specific.

[JimRed]

I wonder how they had any concept of time.

Wearing a watch, maybe, and remembering to wind it.

[DesertRhino]

Probably a wrist watch.

[ConsCA]

“haunting is right. I wonder how they had any concept of time.”

I am guessing their wrist watches.