function to correct date fields

[sbalci]

• https://github.com/ropensci/datefixR
• https://lubridate.tidyverse.org/reference/guess_formats.html
• https://lubridate.tidyverse.org/reference/parse_date_time.html
• https://dirk.eddelbuettel.com/code/anytime.html
• https://www.repidemicsconsortium.org/linelist/reference/guess_dates.html