How do people keep track of time? And for other Earth-based civilizations, what year is it?
For me it's August, 2024 Common Era (CE, or equivalently AD for Anno Domini). I got back to Earth in 2009 and the Hunters attacked us November of 2014. San Diego was destroyed in January 2019.
We customarily start our years in January, which begins slightly after the winter solstice; there are 12 months, January February March April May June July August September October November December, which have about 30 days each for a total of 365 per year, with extra days added slightly less than every 4th year to account for our orbit being 365 days, 5 hours, 49 minutes, and 12 seconds long (on average).
1 day = 24 hours, 1 hour = 60 minutes, 1 minute = 60 seconds. For humans, 1 second is about one heartbeat long; technically it's defined in terms of a specific radioactive decay but that's only used for scientific purposes.
Some people, mostly nerds in space, have started counting dates as AV for After the Vancouver attack; it's 10 AV now. 1 AV starts on the first of January 2015.