The real year is 1979

Level 2 – Bergie Web

Our calendars are not a perfect system to calculate the date. Currently the Gregorian calendar has leap years and months with different days in it, 10 days were removed after switching from the Juilian calendar. We also adjust the time for day light savings, all of these things to try to keep in sync with our celestial movement but in reality there are some huge flaws. History keeping has not been 100% reliable either, with wars, fires and other disaters wiping out records from entire eras.

LINKS
https://www.calendar.com/blog/gregorian-calendar-facts/