Returns the current date and time.
stri_datetime_now()Returns an object of class POSIXct.
Marek Gagolewski and other contributors
The current date and time in stringi is represented as the (signed) number of seconds since 1970-01-01 00:00:00 UTC. UTC leap seconds are ignored.
The official online manual of stringi at https://stringi.gagolewski.com/
Gagolewski M., stringi: Fast and portable character string processing in R, Journal of Statistical Software 103(2), 2022, 1-59, tools:::Rd_expr_doi("10.18637/jss.v103.i02")
Other datetime: 
stri_datetime_add(),
stri_datetime_create(),
stri_datetime_fields(),
stri_datetime_format(),
stri_datetime_fstr(),
stri_datetime_symbols(),
stri_timezone_get(),
stri_timezone_info(),
stri_timezone_list()