Help - Wrong Date in Saving Game

[ashley26ph2003]

hi

I just playing mods in civ 5, bnw
previously when saving mods like napoleonic wars, ww1, pacific war
It has correct date like april 1791 , then may 1791
but when I move civ 5 folder to other place then back again

saving in april 1791 then 1900
also in 1910 europe after 1910 then 1950

how to solve this wrong date