BNR's annual average rate for a year, as ANAF converts foreign income in the D212 ("cursul de schimb mediu anual comunicat de BNR"): the mean of the twelve monthly averages, each the mean of the month's daily rates, to four places, with the monthly values and their day counts. Not the mean of the daily rates, which differs. A year not over yet answers the months so far with complete: false.

An amount converted to or from RON at BNR's reference rate, computed exactly and rounded once: to RON is amount x rate / multiplier, from RON amount x multiplier / rate. rate_rule picks the fixing: in_force (the day's, or the last banking day's before it, as rate answers) or last_before (the last one strictly before the day, the rule for an invoice in a foreign currency). Answers the result with the rate, its multiplier and the date BNR published it, so the conversion can be stated. One side must be RON; for two other currencies, convert twice.

Whether BNR's rates can be read now: the date of its latest fixing and how many currencies it carries.

The National Bank of Romania's reference rate in force on a day: RON per multiplier units of the currency (1, or 100 for HUF, JPY, KRW and a few others), as the exact text BNR published, with published_on, the date of the fixing it is. A weekend, a holiday, or today before BNR publishes (about 13:00 Bucharest) takes the last banking day's fixing. Use it for any EUR/RON or other conversion stated on a date.

BNR's reference rates as series, the exact text BNR published. With date (default today): each currency's rate in force that day, from the day's fixing or the last banking day's before it. With from (and to, default today): every fixing BNR published in the window, oldest first, at most 366 days and 2000 rates a call. Without currencies, every currency BNR published. Each series carries its multiplier (RON per 1, or per 100 for HUF, JPY, KRW and a few others).