date avr. only on the level of centuries

[kasev]

currently, the average dates are on the level of century (e.g. 1.5 = "2nd c. CE") or between-century (e.g. 2= "2nd-3rd c. CE") , what is not so straightforward for interpretation.

You can use the following code:

def update_dateavr(date_avr):
    if ".5" not in str(date_avr):
        date_avr += 0.5
    return date_avr
LAGT["date_avr"] = LAGT["date_avr"].apply(update_dateavr)