The ISS crew celebrated Thanksgiving today.
What timezone would people use for interstellar travel?
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I suspect any interstellar travel will have relativistic effects (it's a factor of even interplanetary travel), the only reasonable timezones are EMET and OMET -- Experienced and Observed Mission Elapsed Times which would have the departure date as its epoch. When these timezones are converted (by adding the epoch) EMET would be somewhat earlier than Zulu time, and OMET would be significantly later.
I think it will be either UTC(If international) Or the country's command center time zone, as the Space Shuttle, Mercury, Apollo, and other USA missions had Houston Time, and Russian missions, like Vostok, Luna and other Russian missions used Mission Control time zone. So here are the answers I think:
Sources: In the book "Spaceman" By Massimo he described how he used houston time aboard the space shuttle, as his EVA was in the morning.
Other spacecraft are from book The NASA archives book(USA), other books by astronauts(Russian), and Movie "Living In Space" about the iss by astronauts(ISS).