Error : Column `Fecha` can't be converted from POSIXct, POSIXt to character ( in R)

Question

I have 13 xlsx files in a folder that have the same columns. So i'd like to open them in a row in R and append them together. Two of the columns (Fecha 1, Fecha 2) contain dates. Fecha 1 is in format yyyy-mm-dd and fecha 2 in the format dd/mm/yyyy.

Here is what i did :

setwd("/Volumes/WD_BLACK/Data/V")

library(readxl)
file.list <- list.files(pattern='*.xlsx')
df.list <- lapply(file.list, read_excel)

df <- bind_rows(df.list)

I get the following error message :

Error : Column Fecha 2 can't be converted from POSIXct, POSIXt to character

So i imported directly one of my file and typed :

typeof(v1$`Fecha 2`)

[1] "double"

The type is the same for Fecha 1.

Does someone know how i can get rid of this error message please, as i work with a list ?

(I underline that i cannot use xlsx package, it doesn't work anymore i think i have issues with Java as i cannot install rJava too.)