To add to the discussion Faerun HAS a calendar called the calendar o Harptos, including all the months and festivals. All the lore exists.
Inhabitants of Faerun also divided the day into ten segments (Godswake, Harbright, Elsun, Thulsun...), you have magically auspicious times (Foredawn, Mornbright, Midmorn, Highmorn...).

Years are referred to by names, each name consistent across the Realms. Each kingdom or city-state numbers years differently, usually to measure the reign of a dynasty or the current monarch, or since the founding of the country. <...The result is a hodgepodge of overlapping numbers that serve to confuse the ordinary person and frustrate the sage.> Dalereckoning(DR), Cormyr Reckoning (CR), Tethyreckoning (TR) etc...

I dont know...Larian not including this in a BALDURS GATE game is just a major oversight to world building for AGAIN the sake of <convenience>.
Whatsmore as already mentioned the game story actually suits itself to have time cycles, your in a rush and time is of the essence.

[Linked Image from i.ibb.co]

Last edited by mr_planescapist; 28/02/21 11:28 PM.