I know the actual year isn't really stated officialy to avoid the "2001: A Space Odyssey" effect... But knowing the year is helpful, so as to know what calender to use... And there are clues.
For instance, it's stated that the oldest gerontocrats are nearing 200 years old, and in Gatecrashing, when they interview that ego that was pulled out of a habitat the TITANs left behind, the ego interviewed states her date of birth as being in the year 1983. If we assume that someone who was born around 1980 (give or take a decade,) started getting access to the first anagathics when they were in their 70s-90s, that would put the first availability of anagathics to the super-rich at around 2050-2070 or so-abouts, and that would be the "near onto one century" mark. Another 90 years or so gives us 1250, and people who can be meaningfully said to be nearing their two century mark.
So, I like to use 2150 as the year of the Fall, and that gives us 2160 as 10 AF, the default time frame of the setting. That lets me say things like "The game is starting on April 2nd, 10 AF/2150 for those still using the old Gregorian calendar." Obviously, the PC is trying to push the Martian calendar, but I imagine few people give a damn and are willing to switch from the calendar everyone's already using. So at most, on Mars, the official shit uses the PC calendar, and everybody's muse automatically translates it into normal-people timekeeping.
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