return date as string in local format
string=getToday(string separator,date)
separator = separator between year, month and day. Default="/"
date = the date, which the system has to convert
getToday() return company date as string, example 2022/05/03
getToday("-") return company date as string with "-" as separator 2022-05-03
getToday(NULL,anyDate) return defined date with "/" as separator