Of course I have ignored leap years and chosen a 30 day month for simplicity in the table above. The day should be divided into 5 hours of light and 5 hours of darkness. It might be coordinated with the rotation of the craft, giving an artificial sun rising and setting each day. Equivalent to approximately 14 hours of daylight and 14 hours of darkness, sufficent for work and rest. I suggest a work day of 3 space hours (8.298 eath hours). As they journey begins there will be a LOT of work to do. At some point, perhaps after 1 spaceyear, as major projects are finished and a routine is established, a 10-day workweek could be reduced to 9, and, at every anniversary, reduced by one day until the spacefarers work perhaps 3 days out of 10.
Of course, a major emergency in space, such as a major collision, would mean no time off until the problem is resolved. The rest of their time should be spent pursuing the arts, or any pursuit not essential to the operation of the ship. Or there might even be a movement to sleep longer and longer, making this, after a few generations, a true “sleeper ship”. It would make everything easier if spacefarers slept twice as much as they were awake.
The ten space months should have names that would remind the voyagers of where they came from. Sol, Terra, Luna, might be a good start. Maybe include names of abbreviations of the leaders of the voyage Maybe September, October, November and December could actually mean 7, 8, 9, 10 as they did in Roman times (an historical reminder). If they wish, there could be Spring, Summer, Fall and Winter if such designations were appropriate for the agriculture they have brought with them.
Since anything at sub-light speeds will eventually take tens of thousands of years to reach a destination star (even a close one), there might be a memorial on earth about the voyage with the Spacetime of the craft and the equivalent Earthtime, and perhaps a third clock showing the earthtime since they left. It should include interactive displays of the individual voyagers, their history before and after the journey starts. As we will communicate with them by Quantum Entaglement, we can update the records in the memorial to show births, deaths, marriages, key events etc.
It is a curious question to know if earth will maintain this memorial for the entire voyage and if we will know about the travelers at all by the time they arrive at their new home. We still have vague records back 5,000 years to the Egyptians,
Babylonians, Phoenicians and similar societies. We have evidence of carvings and structures (such as Gobekli Tepi) back 11,000-12,000 years With long-term electronic archiving, this may not be a problem. The real problem will be if we care, if we wish to remember them.
Of course, if things become impossible on earth, there may be many such ships setting out in different directions, toward different stars, into the Great Unknown. A good science fiction novel might be about the LAST ship to leave earth. Who was on it and who not? Where it was headed? How many ship preceeded it? Was it remembered or forgotten? What if there was a mutiny and some of them returned home instead?